Analysis of data files G22-201 R79_10 and R79_24 - attachments 1-2

Observe HIGH deadtime for FEE64 aida11 (attachment 1) and aida16 (attachment 2) associated with *very* high pause/resume/HEC/disc data item rates.

R79_10

deadtime aida11 99.4%
pause/resume ~ 720Hz
HEC ~ 2800Hz
disc ~ 250kHz


R79_24

deadtime aida16 18.7%
pause/resume ~ 140hZ
HEC ~ 540Hx
disc ~ 50kHz

Offline analysis data file G22-201/R89_0 to R89_13 (c. 6h40m data)

DSSSD#1 & 3 36.54mm -> ~ 2.3-8.6 deg 
DSSSD#2 & 4 64.60mm -> ~ 4.1-10.4 deg 


Beam ~1.06MeV/u 15N5+


Sort program variables https://elog.ph.ed.ac.uk/CARME/240530_180659/variables.dat

ADC data corrected for ADC offset but not gain (assume 0.7keV/LSB)

per DSSSD m_p verus m_n - attachments 1-2

For spectra below events must satisfy condition 0 < m_p < 4 *and* 0 < m_n < 4
 gated w(1)=50 & w(2)=-50
 20keV/channel nominal

per DSSSD p+n junction strip versus n+n Ohmic strip - attachment 3
 note - x/y channel ordering to be checked

per DSSSD E_p versus E_n - attachments 4 & 6
 check whether vertical structures (correct E_n but low E_p) are associated with specific strips or edge of DSSSD?

per DSSSD E_p versus E_n - attachment 5 & 7
 expanded view high energy events 

DSSSD #1 E_p + DSSSD#4  E_p - attachment 8
DSSSD #2 E_p + DSSSD#3  E_p - attachment 8

DSSSD #1 E_p versus DSSSD#4  E_p - attachment 9
DSSSD #2 E_p versus DSSSD#3  E_p - attachment 9
 note clusters of events at asymmetric energies but only for one combination of detectors - random events?


______________________________________________________________________________________________________________________________

               Reaction: 1H(15N,4He)12C

                      A:           1         15          4         12
                      Z:           1          7          2          6
              Mass(amu):    1.007825  15.000109   4.002603  12.000000
             Error(keV):       0.000      0.001      0.001      0.000
                 Origin:
                 Status:

                  Q(gs):    4.9655 +/-   0.0001 MeV

  Projectile lab energy:   15.900 MeV
              CM energy:    1.001 MeV
      Excitation energy:    0.000 MeV
       Reaction Q-value:    4.965 MeV
     Reaction threshold:    0.000 MeV

                 Particle 3                               Particle 4                           Non-relativistic Jacobians
           ( scattered/ejectile )                         ( recoil )                                           Ejectile Ejectile
                                                                                               Ejectile Recoil dOmega/  dOmega/
  Lab    CM       Lab   Lab     Lab    dOmega      Lab    CM       Lab   Lab     Lab    dOmega  dOmega  dOmega Recoil   Recoil
 Angle  Angle   Energy  Beta    ToF    Lab/CM     Angle  Angle   Energy  Beta    ToF    Lab/CM  Lab/CM  Lab/CM dOmega   dOmega
 (deg)  (deg)    (MeV)        (ns/cm)  ratio      (deg)  (deg)    (MeV)        (ns/cm)  ratio                  Lab/Lab  CM/Lab

  0.00 NaN      16.372 0.0934   0.357 NaN          0.00 NaN       4.494 0.0283   1.177 NaN     NaN     NaN     NaN     NaN
  1.00   1.91   16.367 0.0934   0.357  0.2729      1.10 178.09    4.498 0.0284   1.176 -0.3314  0.2729 -0.3314 -0.8233 -3.0175
  2.00   3.83   16.354 0.0934   0.357  0.2730      2.20 176.17    4.512 0.0284   1.174 -0.3290  0.2730 -0.3290 -0.8296 -3.0393
  3.00   5.74   16.331 0.0933   0.358  0.2732      3.29 174.26    4.535 0.0285   1.171 -0.3251  0.2732 -0.3251 -0.8403 -3.0759
  4.00   7.66   16.299 0.0932   0.358  0.2735      4.37 172.34    4.566 0.0286   1.167 -0.3197  0.2735 -0.3197 -0.8553 -3.1277
  5.00   9.57   16.258 0.0931   0.358  0.2739      5.43 170.43    4.607 0.0287   1.162 -0.3129  0.2738 -0.3130 -0.8750 -3.1954
  6.00  11.49   16.208 0.0929   0.359  0.2743      6.47 168.51    4.657 0.0289   1.156 -0.3049  0.2743 -0.3049 -0.8996 -3.2796
  7.00  13.40   16.150 0.0928   0.360  0.2749      7.49 166.60    4.716 0.0290   1.149 -0.2957  0.2749 -0.2957 -0.9294 -3.3815
  8.00  15.31   16.082 0.0926   0.360  0.2755      8.48 164.69    4.784 0.0292   1.141 -0.2855  0.2755 -0.2855 -0.9648 -3.5023
  9.00  17.23   16.006 0.0924   0.361  0.2762      9.45 162.77    4.860 0.0295   1.132 -0.2745  0.2762 -0.2745 -1.0063 -3.6434
 10.00  19.14   15.921 0.0921   0.362  0.2770     10.38 160.86    4.945 0.0297   1.122 -0.2627  0.2770 -0.2627 -1.0545 -3.8067
 11.00  21.05   15.827 0.0918   0.363  0.2779     11.27 158.95    5.039 0.0300   1.111 -0.2503  0.2779 -0.2503 -1.1100 -3.9944
 12.00  22.96   15.725 0.0916   0.364  0.2789     12.13 157.04    5.141 0.0303   1.100 -0.2376  0.2789 -0.2376 -1.1738 -4.2091
 13.00  24.87   15.614 0.0912   0.366  0.2800     12.96 155.13    5.251 0.0306   1.089 -0.2245  0.2800 -0.2245 -1.2469 -4.4539
 14.00  26.78   15.496 0.0909   0.367  0.2812     13.74 153.22    5.370 0.0310   1.077 -0.2113  0.2811 -0.2113 -1.3305 -4.7326
 15.00  28.69   15.369 0.0905   0.369  0.2824     14.49 151.31    5.496 0.0313   1.064 -0.1980  0.2824 -0.1980 -1.4260 -5.0496

______________________________________________________________________________________________________________________________

 Options available:
    (r)eaction   e(x)citation energy   (e)nergy   (a)ngles   (p)rint   (q)uit

 Enter option: x

 Enter excitation energy (MeV): 4.44

 Enter projectile lab energy (MeV): /

 Enter lab scattering angles [start,stop,step] (deg): /

______________________________________________________________________________________________________________________________

               Reaction: 1H(15N,4He)12C

                      A:           1         15          4         12
                      Z:           1          7          2          6
              Mass(amu):    1.007825  15.000109   4.002603  12.000000
             Error(keV):       0.000      0.001      0.001      0.000
                 Origin:
                 Status:

                  Q(gs):    4.9655 +/-   0.0001 MeV

  Projectile lab energy:   15.900 MeV
              CM energy:    1.001 MeV
      Excitation energy:    4.440 MeV
       Reaction Q-value:    0.525 MeV
     Reaction threshold:    0.000 MeV

                 Particle 3                               Particle 4                           Non-relativistic Jacobians
           ( scattered/ejectile )                         ( recoil )                                           Ejectile Ejectile
                                                                                               Ejectile Recoil dOmega/  dOmega/
  Lab    CM       Lab   Lab     Lab    dOmega      Lab    CM       Lab   Lab     Lab    dOmega  dOmega  dOmega Recoil   Recoil
 Angle  Angle   Energy  Beta    ToF    Lab/CM     Angle  Angle   Energy  Beta    ToF    Lab/CM  Lab/CM  Lab/CM dOmega   dOmega
 (deg)  (deg)    (MeV)        (ns/cm)  ratio      (deg)  (deg)    (MeV)        (ns/cm)  ratio                  Lab/Lab  CM/Lab

  0.00   0.00    9.002 0.0694   0.481  0.0000      0.00 180.00    7.423 0.0364   0.916  0.0000  0.0000  0.0000 NaN     NaN
       180.00    0.740 0.0199   1.675  0.0000      0.00   0.00   15.686 0.0529   0.630  0.0000  0.0000  0.0000 NaN     NaN
  1.00   2.81    8.997 0.0693   0.481  0.1270      0.64 177.19    7.428 0.0364   0.915 -0.0513  0.1270 -0.0513 -2.4762 *******
       179.20    0.740 0.0199   1.674  1.5463      0.13   0.80   15.685 0.0529   0.630  0.0243 -1.5463  0.0243 ******* 41.1048
  2.00   5.61    8.983 0.0693   0.481  0.1271      1.27 174.39    7.443 0.0365   0.915 -0.0509  0.1271 -0.0509 -2.4951 *******
       178.39    0.741 0.0199   1.673  1.5414      0.25   1.61   15.684 0.0529   0.630  0.0243 -1.5414  0.0243 ******* 41.1102
  3.00   8.42    8.958 0.0692   0.482  0.1271      1.90 171.58    7.468 0.0365   0.913 -0.0503  0.1271 -0.0503 -2.5269 *******
       177.58    0.743 0.0200   1.671  1.5334      0.38   2.42   15.682 0.0529   0.630  0.0243 -1.5334  0.0243 ******* 41.1194
  4.00  11.24    8.923 0.0691   0.483  0.1271      2.52 168.76    7.502 0.0366   0.911 -0.0494  0.1271 -0.0494 -2.5722 *******
       176.77    0.746 0.0200   1.668  1.5221      0.50   3.23   15.679 0.0529   0.630  0.0243 -1.5221  0.0243 ******* 41.1323
  5.00  14.05    8.879 0.0689   0.484  0.1272      3.13 165.95    7.547 0.0367   0.908 -0.0483  0.1272 -0.0483 -2.6319 *******
       175.96    0.750 0.0201   1.663  1.5077      0.63   4.04   15.676 0.0529   0.631  0.0243 -1.5077  0.0243 ******* 41.1490
  6.00  16.88    8.824 0.0687   0.486  0.1273      3.73 163.12    7.601 0.0369   0.905 -0.0470  0.1273 -0.0470 -2.7072 *******
       175.13    0.754 0.0201   1.658  1.4901      0.76   4.87   15.671 0.0529   0.631  0.0243 -1.4901  0.0243 ******* 41.1697
  7.00  19.71    8.760 0.0684   0.487  0.1273      4.32 160.29    7.665 0.0370   0.901 -0.0455  0.1273 -0.0455 -2.7995 *******
       174.30    0.760 0.0202   1.652  1.4695      0.89   5.70   15.665 0.0529   0.631  0.0243 -1.4695  0.0243 ******* 41.1945
  8.00  22.55    8.686 0.0681   0.490  0.1274      4.89 157.45    7.739 0.0372   0.897 -0.0438  0.1274 -0.0438 -2.9108 *******
       173.46    0.766 0.0203   1.645  1.4458      1.02   6.54   15.659 0.0529   0.631  0.0243 -1.4458  0.0243 ******* 41.2236
  9.00  25.41    8.603 0.0678   0.492  0.1275      5.44 154.59    7.823 0.0374   0.892 -0.0419  0.1275 -0.0419 -3.0436 *******
       172.61    0.774 0.0204   1.637  1.4191      1.15   7.39   15.652 0.0529   0.631  0.0242 -1.4192  0.0242 ******* 41.2573
 10.00  28.27    8.509 0.0674   0.495  0.1276      5.97 151.73    7.916 0.0376   0.887 -0.0399  0.1276 -0.0399 -3.2011 *******
       171.75    0.782 0.0205   1.628  1.3896      1.28   8.25   15.643 0.0528   0.631  0.0242 -1.3896  0.0242 ******* 41.2958
 11.00  31.15    8.407 0.0670   0.498  0.1277      6.48 148.85    8.019 0.0379   0.881 -0.0377  0.1277 -0.0377 -3.3875 *******
       170.87    0.792 0.0206   1.619  1.3572      1.42   9.13   15.634 0.0528   0.631  0.0242 -1.3572  0.0242 ******* 41.3394
 12.00  34.05    8.294 0.0666   0.501  0.1278      6.97 145.95    8.131 0.0381   0.875 -0.0354  0.1278 -0.0354 -3.6080 *******
       169.97    0.803 0.0207   1.608  1.3221      1.56  10.03   15.623 0.0528   0.632  0.0242 -1.3221  0.0242 ******* 41.3886
 13.00  36.96    8.172 0.0661   0.505  0.1279      7.43 143.04    8.253 0.0384   0.868 -0.0330  0.1279 -0.0330 -3.8695 *******
       169.06    0.815 0.0209   1.596  1.2843      1.70  10.94   15.611 0.0528   0.632  0.0241 -1.2844  0.0241 ******* 41.4437
 14.00  39.90    8.040 0.0656   0.509  0.1280      7.87 140.10    8.385 0.0387   0.862 -0.0306  0.1280 -0.0306 -4.1814 *******
       168.13    0.828 0.0211   1.583  1.2440      1.84  11.87   15.598 0.0528   0.632  0.0241 -1.2441  0.0241 ******* 41.5053
 15.00  42.86    7.899 0.0650   0.513  0.1280      8.28 137.14    8.526 0.0390   0.855 -0.0281  0.1280 -0.0281 -4.5560 *******
       167.17    0.843 0.0213   1.569  1.2012      1.99  12.83   15.583 0.0527   0.632  0.0241 -1.2013  0.0241 ******* 41.5741

______________________________________________________________________________________________________________________________


Assume alphas of coincident events detected at 5 deg lab

1H(15N,4He)12C(gs)    E_alpha + E_12C = 16.528+4.607MeV = 20.865MeV - 0.9MeV 12C energy loss dead layer = 19.965MeV = ch 998


1H(15N,4He)12C(4.44)    forward CM E_alpha + E_12C = 0.750+15.676MeV = 16.426MeV - 0.8MeV 12C energy loss dead layer = 15.626MeV = ch 781
1H(15N,4He)12C(4.44)   backward CM E_alpha + E_12C = 8.879+7.547MeV = 16.426MeV - 0.9MeV 12C energy loss dead layer = 15.526MeV = ch 776

DSSD off

FEEs off

Motors out, pin inserted, compressed air closed, power removed from motors box.

Motors and temperature logs are in carme-gsi:logs/G22-200

Next experiment will install new setup attached to gas target. Some baking and vacuum operations required. Everything should stay off for safety until they are done.

Run 101: no target. See ELOG entry by TD.

Run 102: ??

Run 103: ??

Run 104: After experiment time is over, Gleb tests beam lifetime at "high energies". Some data acquired for 30 minutes.

Run 105: Quick pulser walkthrough. People are working near CARME. Positive polarity 1000-9000 amplitude.

10:21 June 17

New energy: 1.125 MeV/u

Target in. Run 98 started.

Run 99 overlap check.

Run 100 back to acquisition as run 98.

Run 96 - as run 89, while we wait for beam energy change at higher energies

Run stopped around 08:56 June 17

Run 97 - target out, beam optimisation for higher energies.

23.18 DSSSD bias & leakage current OK - attachment 1
      FEE64 temps OK - attachment 2
      ADC data item stats attachment 3
       aida01-aida04 c. 250k
      per FEE64 1.8.W spectra - 20us FSR - attachments 4-5
       large transients aida01-aida04
      per FEE64 Rate spectra - attachment 6
      Merger, TapeServer etc. - attachments 7-8
        data file R101_15
      DSSSD energy spectra (updating) - attachment 9
      DSSSD bias & leakage current log - attachment 10
        transients bottom & top left c. 02:00 18.6.24


      cycle slow comparator 0x32 -> 0x64 -> Check ASIC Control -> 0x32
        aida01 - aida04 rates return to normal

      ADC data item stats - attachment 11
      DSSSD energy spectra - attachment 12

23.40 cycle slow comparator 0x32 -> 0x64 -> Check ASIC Control -> 0x32
        aida01 - aida04 rates return to normal


00.10 cycle slow comparator 0x32 -> 0x64 -> Check ASIC Control -> 0x32
        aida01 - aida04 rates return to normal

01.43 ADC item stats OK - attachment 13
       FEE64 temps OK - attachment 14

04.43 ADC data items stats
       ADC data item stats - attachment 15
       FEE64 temps OK - attachment 16
       cycle slow comparator 0x32 -> 0x64 -> Check ASIC Control -> 0x32
        aida01 - aida04 rates return to normal
       ADC data item stats - attachment 17
       per FEE64 Rate spectra - attachment 18
       Merger, TapeServer etc. - attachment 19
        data file R101_51

07.00 FEE64 temps OK - attachment 21
      ADC data items OK - attachment 20
      Merger, Tape Server OK - attachment 22

      DSSSD bias & leakage current - attachment 23

      DAQ stop, close data file
      DSSSD bias OFF
      FEE64 power OFF
         

Gzip'ing all uncompressed data files

04:00 17 June

Moved the detectors back to the usual configuration (as per run 89).

Moved target away - background run.

Some issues with run numbers - see attached run name R93, but run 94 is written. See attached. 93 and 95 contain data. 94 does *not* exist.

No obvious differences wrt. target run, except Rutherford.

~ 2:00 17 June

Run 91

Attempted to move the detectors closer to the beam, and move them in sync with the injection.

Found best position was

Right arm: s by 5 mm, r p in (not moving). No benefits from moving. 10 mm + r p in on sync results in beam clipping during injection. 69.55 mm not moving.

Left arm: s by 5 mm, l p in (in sync with motion). Due to the short beam preparation time, only the trigger out was used as per screenshots below. 23.58 -- 67.90 moving.

Saw spike on leakage current for both detectors on the right arm. Unsure if this because they are being moved, or because they were hit with beam. Leakage current recovered.

Run 92 - acquired data as above.

Rutherford locus more clear on left arm detectors. No clear sign of nuclear reactions signals.

00:10

As run 89, detectors moved fully out.

01:20

TL detector noisy. Shook it. Fixed it.

Temps OK. Noise spike reported in Run 89 still there.

Target 6E11. Beam stable.

02:00

TL detector noisy. Shook it. Fixed it.

ELOG STOPPED WORKING

17:20

(Run 87 Junk and Run 88 does not exist)

Beam charge state set to 5+. Energy is ~1.06 MeV/u

Cooler voltage setpoint 590.3 V.

FC20 read value 589.07 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 3.5 mm (new overlap position with new beam)

vertical beam position  0.0 mm

Beam intensity 7.0e+6 particles.

Target density ~5e11 at/cm2

Beam is stored in the ring for ~20 seconds. From beam overlap tests ~ 75% of the beam is destroyed in this time.

Beam halo appears slightly reduced. This may be due to reduced intensity and reduced injection rate (20 s vs 5s previously)

18:00

FEE64 temperatures OK

ADC data item stats OK

per FEE64 Rate spectra OK

Beam intensity 1.17e+7 particles

Target density ~5.25E11 atoms/cm2

20:28

FEE64 temperatures OK

ADC data item stats OK

per FEE64 Rate spectra OK

Beam intensity 1.08e+7 particles

Target density ~3.84E11 atoms/cm2

23:58

Temps OK. Stats OK. Merger OK. Write to disk OK.

Waveforms attached.

Beam keeps going away due to "solenoid" issues.

On-line analysis screenshots attached.

Without beam, we see a clear noise spike in all detectors every 50-200 seconds randomly. This is *not* correlated with beam injection or dump.

Checkloaded - no effect. Beam back - no changes.

07:00

We are changing to 5+ beam so that we can access higher energies and possibly observe a higher lying, wider resonance.

Beam energy change to 1.06 MeV/u.

Detectors out

Target nozzle out

Pressure in E1 had reached 2e-1 mbar and turbo was spinning down to 810 Hz. Pressure reduced and E1 has reduced to 8.2e-2 mbar. We may require a pressure increase when we want the target back?

Run changed and out into no storage mode so we do not write rubbish to disk.

11:34

Beam tuning in the ring in progress

Merger OK. Not writing to disk.

Temps OK. Rates OK.

Leakage current OK.

Motors out. Target out.

13:31

Checks OK. Beam tuning near completion.

Some data acquired during beam tuning attached.

06:50

No sign of the resonance during night shift. New run started but when operators are avaiable we will likely move to higher energies to try and observe the (p,a) reaction.

Cooler voltage setpoint 247.8 V.

FC20 read value 247.25 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~5e11 at/cm2

05:00

Cooler voltage setpoint 247.45 V.

FC20 read value 246.9 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~5e11 at/cm2

Target temperature is 38.6 K. Values of E1 is 819 Hz, 2.7A, 1.85e-1 mbar

All checks OK

03:00

Cooler voltage setpoint 247.7 V.

FC20 read value 247.15 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~5e11 at/cm2

Target temperature is 38.6 K. Values of E1 is 820 Hz, 2.7A, 1.8e-1 mbar

All checks OK

03:34

Noise increase in top left dssd. Servo motor moved to resolve issue.

01:00

Cooler voltage setpoint 247.6 V.

FC20 read value 247.05 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~5e11 at/cm2

Target temperature is 38.6 K. Values of E1 is 820 Hz, 2.7A, 1.7e-1 mbar

All checks OK

02:50

Noise increase on dssd top left. Moved servo  motor to resolve issue.

23:38

Cooler voltage setpoint 247.5 V.

FC20 read value 246.95 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~5e11 at/cm2

Target temperature is 38.6 K. Values of E1 is 820 Hz, 2.7A, 1.7e-1 mbar

All checks OK

23:10

Beam set to bunched mode to observe beam lifetime. 

Electron cooler voltage setpoint kept at 246.8 V. Note this is 0.5 V lower than the previous test where the setpoint was 247.3 V

This corresponds to ~13.5 keV in the beam energy.

Attachment 1 shows target scan. Maximum still observed at a horizontal beam position of 1.0 mm.

Moving 0.5 V up or down does not impact the orbit enough to shift the beam position off the target.

Beam lifetime off target seems larger than previous, perhaps better vacuum conditions?

Back to coasting beam

20:00

Ecooler setpoint 246.8

Readout 246.25

Collector current 4.3

Target density ~5.3E11

Beam intensity 7E7 ions

14:51

Ecooler setpoint 246.9

Readout 246.35

Collector current 4.3

Target density 4.6E11

Beam intensity 8E7 ions

Shook left arm to fix it.

15:32

Right half on BL detector was not counting. Checkloaded. Fixed.

17:20

Moved left arm out/in to fix it.

Reduced temperature to 38.5 K in steps as the target density was declining.

E1: pressure: 1.57E-1 mbar, turbo frequency: 819  Hz

Target density: 1.5E11 atoms/cm2; Ion beam intensity: 6E7 particles (went down slightly, have not been able to get everything back)

DSSSD bias & leakage current OK 
FEE64 temperatures OK 
ADC data item stats OK 
per FEE64 Rate spectra OK 

19:50

E1: pressure: 1.61E-1 mbar, turbo frequency: 819  Hz

Target density: 1.5E11 atoms/cm2; Ion beam intensity: 7E7 particles (recovered slightly)

DSSSD bias & leakage current OK 
FEE64 temperatures OK 
ADC data item stats OK 
per FEE64 Rate spectra OK 

Target clogged?

Run 77 started at 06:48

Cooler voltage setpoint 247.0 V.

07:05

DSSSD bias & leakage current OK - attachments 1 & 2

FEE64 temperatures OK - attachment 3

ADC data item stats OK - attachment 4

per FEE64 Rate spectra OK - attachment 5

Beam intensity 8.45e+7 particles

Target density ~5.34E11 atoms/cm2

09:02

DSSSD bias & leakage current OK - attachments 6 & 7

FEE64 temperatures OK - attachment 8

ADC data item stats OK - attachment 9

per FEE64 Rate spectra OK - attachment 10

Beam intensity 7.85e+7 particles

Target density ~5.29E11 atoms/cm2

11:00

DSSSD bias & leakage current OK - attachments 11 & 12

FEE64 temperatures OK - attachment 13

ADC data item stats OK - attachment 14

per FEE64 Rate spectra OK - attachment 15

Beam intensity 8.5e+7 particles

Target density ~6.1E11 atoms/cm2

13:00

DSSSD bias & leakage current OK - attachments 16 & 17

FEE64 temperatures OK - attachment 18

ADC data item stats OK - attachment 19

per FEE64 Rate spectra OK - attachment 20

Beam intensity 8.2e+7 particles

Target density ~6.1E11 atoms/cm2

22:15

New run 76 - beam on target with definite target overlap [coasting]

Cooler voltage setpoint 247.1 V.

FC20 read value 246.55 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm (new beam target overlap)

vertical beam position  -5mm

Beam intensity 7.5e+7 particles.

Target density ~6.2e11 at/cm2

Target temperature is 38.5 K. Values of E1 is 820 Hz, 2.6A, 1.85e-1 mbar

00:15

System and detector check is OK. E1 pressure is increasing slowly. target 4e+11/cm2

02:15

System and detector check is OK. E1 pressure is increasing slowly. P=2,2e-1 mbar Pump frequency is 807 Hz, 2.7A. Target 5e+11/cm2

03:15

System and detector check is OK. E1 pressure reaches 2,3e-1 mbar, thus flow is decrease a bit. Pump frequency is 800 Hz, 2.8A. Target 6e+11/cm2

04:15

System and detector check is OK. E1 pressure is stabilized. New values: 2.07e-1 mbar, 810 Hz, 2.8 A. Target 5e+11/cm2. Resonance peak not so visible- see attachment 1.

05:43

System and detector check is OK. E1 pressure is slowly increasing. New values: 2.13e-1 mbar, 807 Hz, 2.8 A. Target 5e+11/cm2. Beam intensity stable at 7e+7 particles.

14:30

New run 75 - beam on target with definite target overlap [coasting]

Cooler voltage setpoint 247.2 V.

FC20 read value 246.65 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm (new beam target overlap)

vertical beam position  -5mm

Beam intensity 8.5e+7 particles.

Target density ~6e11 at/cm2

Target temperature is 36.6 K. Values of E1 is 820 Hz, 2.6A, 1.4e-1 mbar

16:00

Beam intensity 8.5e+7 particles.

Target density ~4e11 at/cm2

Target temperature is 36.6 K. Values of E1 is 820 Hz, 2.6A, 1.68e-1 mbar

DSSSD bias & leakage current OK - attachment 1

FEE64 temperatures OK - attachment 2

ADC data item stats OK - attachment 3

16:58

Pressure on E1 has risen to 1.74e-1 mbar. Target density ~4.5e11 at/cm2.

Turbo is decreased to 818-819 Hz. We will increase temperature sligtly to see if this helps.

17:11

Increase in noise on top left DSSD. Correlates with spike in the source seen on lassie. Moved servo motor out then in. Problem resolved. 

System checks OK

18:35

Tempature has been increase in small steps to 38.4 K. E1 appears to have stabalised at 1.71e-1 mbar. Turbo speed 818-819 Hz. 

Target density ~5.5e11 at/cm2. We will wait to see how it evolves over time.

18:47

Increase in noise on top left DSSD. Correlates with spike in the source seen on lassie. Moved servo motor out then in. Problem resolved. 

20:55

All checks OK

Tempature has been increase in small steps to 38.4 K. E1  1.81e-1 mbar. Turbo speed 818-819 Hz. 

21:48

System checks OK

22:14

Run stopped

7:00

Cooler voltage setpoint 247.4 V.

7:44

E1 Turbo at 808 Hz, 2.75 A

DSSSD bias & leakage current OK 

FEE64 temperatures OK 

ADC data item stats OK 

per FEE64 Rate spectra OK 

Beam intensity 7.5e+7 particles

Target density ~3E10 atoms/cm2

8:30

E1 pressure was too high (2.13E-1 mbar) and turbo frequency too low (807 Hz).

We increased T1 in steps of 0.2 K to 39.6 K, which improved in E1 (2E-1 mbar) and turbo freq. (813 Hz).

T1 was decreased again to 39.4 K.

After speaking to Nikos we slightly decreased the gas flow (~15 bar) as desribed in elog entry 631.

Values now: turbo (817 Hz), E1 pressure (1.78E-1 mbar) -> both improved

10:06

The gas flow was decreased in three steps, there is now change visible on the gauge (still ~15 bar).

The turbo frequency ist stable at 819 Hz and pressure at E1 is 1.45E-1 mbar.

The temperature is currently at 39.0 K and we will start decreasing it to try and bring the target density up.

DSSSD bias & leakage current

OK FEE64 temperatures OK

ADC data item stats OK

per FEE64 Rate spectra OK

Beam intensity 7.5e+7 particles

Target density ~2E10 atoms/cm2

11:50

All system checks OK

Target density is ~3e11 at/cm2.

Temoerature of the nozzle is curretnly 37.5K with E1=1.6e-1 mbar. Turbo running at 820 Hz

14:29

Run stopped

CRYRING hall temperature transient - evening of Friday 14 June

Cooling of recirculating water failed on a number of circuits within the GSI experimental hall including S4 and CRYRING
Subsequently repaired bu on-call maintenance engineer

Beam is back.New run started.

Cooler voltage setpoint 247.3 V.

23:18

DSSSD bias & leakage current OK 

FEE64 temperatures OK 

ADC data item stats OK 

per FEE64 Rate spectra OK 

Beam intensity 6e+7 particles

Target density ~4E10 atoms/cm2

01:01

DSSSD bias & leakage current OK - attachment 1 & 5

FEE64 temperatures OK - attachment 2

ADC data item stats OK - attachment 3

per FEE64 Rate spectra OK - attachment 4

Beam intensity 7e+7 particles

Target density ~5E11 atoms/cm2

03:03

DSSSD bias & leakage current OK - attachment 6 & 7

FEE64 temperatures OK - attachment 8

ADC data item stats OK - attachment 9

per FEE64 Rate spectra OK - attachment 10

Beam intensity 7e+7 particles

Target density ~4E11 atoms/cm2

05:00

DSSSD bias & leakage current OK - attachment 11 & 15

FEE64 temperatures OK - attachment 12

ADC data item stats OK - attachment 13

per FEE64 Rate spectra OK - attachment 14

Beam intensity 7.4e+7 particles

Target density ~5E11 atoms/cm2

05:15

Turbo frequency went below 810 Hz. Set temperature increased from 38.8 K to 39.0 K.

06:50

DSSSD bias & leakage current OK - attachment 16 & 17

FEE64 temperatures OK - attachment 18

ADC data item stats OK - attachment 19

per FEE64 Rate spectra OK - attachment 20

Beam intensity 7.5e+7 particles

Target density ~2.3E11 atoms/cm2

21:00

Target is lost. Background run is being collected.

New run 72 - beam on target with definite target overlap [coasting]

Cooler voltage setpoint 247.3 V.

FC20 read value 246.75 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm18:00

FakeMotion script running

horizontal beam position 1.0 mm (new beam target overlap)

vertical beam position  -5mm

Beam intensity 6e+7 particles.

Target density ~3e9 at/cm2

Target temperature is 90 K. Values of E1 is 820 Hz, 2.6A, 4.2e-2 mbar

Aida03 detector T is stable.SCreenshot is attached.

22:27

Cooling fixed. Temps OK.

The orbit of the beam in the ring was re-configured so that the beam position is more central.

With the target density at ~6e11 at/cm2 this allowed a target overlap scan using the beam lifetime to be performed. 

Beam put into bunched mode to allow the number of particles to be observed on Grafana.

The number of particles injected at the start of the cycle was then compared to the number of particles at the end of the cycle to gauge the % of the beam lost.

A flat top region was observed where >99% of the particles in the ring were lost. The centre of this flat top corresponds to a horizontal beam position of 1.0 mm

Attachment 1 - Grafana plot of beam intensity

Attachment 2 - Plot of overlap

ONLY FOLLOW THESE INSTRUCTIONS if E1 turbo is below 820 Hz, pressure in E1 is above 2.5E-1 mbar and experts (Nikos, Andreas) cannot be reached.

Go to the red cabinet under the stairs.

Open rightmost door. See first photo. Do not press the button on the handle or the door will lock!

Turn down pressure regulator indicated in second photo by approximately 1 degree. Read regulator to know which way to turn to decrease. No immediate change should be obvious on the pressure regulator.

Check E1 pressure for 5 minutes. If no effect, turn pressure down again until an effect appears.

15:45

New run 71 - beam on target with definite target overlap [coasting]

Cooler voltage setpoint 247.3 V.

FC20 read value 246.75 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm18:00

FakeMotion script running

horizontal beam position 1.0 mm (new beam target overlap)

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~4e11 at/cm2

Target temperature is 36.6 K. Values of E1 is 820 Hz, 2.6A, 1.4e-1 mbar

16:36

No difference observed between bunched and coasting

See attached screenshots to compare to previous run

Saw an increase in the data rate to disk ~ 2000 kB/s. On spectrum browser we saw aida15 had HEC reading hot. ASIC check on aida 15 resolved issue

18:00

Beam intensity 6e+7 particles.

Target density ~6e11 at/cm2

Target temperature is 36.6 K. Values of E1 is  820 Hz, 2.7 A, 1.5e-1 mbar

Aida03 detector temperature is 66 degree.

20:00

Beam intensity 6e+7 particles.

Target density ~6e11 at/cm2

Target temperature is 36.6 K. Values of E1 is  820 Hz, 2.7 A, 1.6e-1 mbar

Aida03 detector temperature is 63 degree. Screenshot is attached.

21:00

arget densityis dropped drastically. A temperature is ncreased signifiantly.

Beam intensity 6e+7 particles.

Target density ~2.7e9 at/cm2

Target temperature is 9 K. Values of E1 is  820 Hz, 2.7 A, 4.2e-2mbar

Aida03 detector temperature is 63 degree. Screenshot is attached.

14:45

New run 70 - beam on target with definite target overlap

Cooler voltage setpoint 247.3 V.

FC20 read value 246.75 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

FakeMotion script running

horizontal beam position 1.0 mm (new beam target overlap)

vertical beam position  -5mm

Beam intensity 7.0e+7 particles.

Target density ~6.3e11 at/cm2

Target temperature is 36.6 K. Values of E1 is 820 Hz, 2.6A, 1.4e-1 mbar

All system checks OK, data rate is ~ 260 kB/s. Statistics attached.

xy and energy histograms following ~20 mins attached.

15:45

I realised we have been running in bunched mode not coasting as we have been previously.

See attached screenshots (4-7) of last 1 hour of running. We will move to coasting.

Frank has been tuning the beam since 08:00

detectors moved fully out

11:20

New run (R68) started at 11:20. Put into no storage mode as rates are high during beam tuning. Cut off the end of last nights run when analysing

System checks OK

13.20 DSSSD bias & leakage current OK - attachment 1

FEE64 temperatures OK - attachment 2

ADC data item stats - attachment 3

per FEE64 1.8.W spectra - attachments 4-5

per FEE64 Rate spectra - attachment 6

 aida16 producing HEC data - Chck ASIC load to fix

TapeServer - no storage mode

13.35 aida01-aida04 c. 250k ADC data items/s - will await completion of current beam/target scan to fix by cycing Left DSSSD motion

14.00 CB cycles Left DSSSD motion to fix aida01-aida04 rate issue

CRYRING vacuum & hall temprature - attachments 7-8

14.28 New run data file G22-201/R69

Beam/target overlap optimised - details to follow

Run 67

00:01

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats OK - attachment 3

      per FEE64 Rate spectra OK - attachment 4

           Beam intensity 5.7E7 particles

           Target density - 4.98E11 atoms/cm2

02:01

      DSSSD bias & leakage current OK - attachment 5

      FEE64 temperatures OK - attachment 6

      ADC data item stats OK - attachment 7

      per FEE64 Rate spectra OK - attachment 8

           Beam intensity 5.8E7 particles

           Target density - 4.39E11 atoms/cm2

04:00

      DSSSD bias & leakage current OK - attachment 9

      FEE64 temperatures OK - attachment 10

      ADC data item stats OK - attachment 11

      per FEE64 Rate spectra OK - attachment 12

           Beam intensity 4.1E7 particles

           Target density - 3.57E11 atoms/cm2

06:00

      DSSSD bias & leakage current OK - attachment 13

      FEE64 temperatures OK - attachment 14

      ADC data item stats OK - attachment 15

      per FEE64 Rate spectra OK - attachment 16

           Beam intensity 3.7E7 particles

           Target density - 3.89E11 atoms/cm2

08:00

          The orbit adjustments started. The detectors moved out. One of these showed rates of about 20kHz. but after moving it in and out again it returned to normal.

11:00

      DSSSD bias & leakage current OK - attachment 17

      FEE64 temperatures OK - attachment 18

      ADC data item stats OK - attachment 19

      per FEE64 Rate spectra OK - attachment 20

           Beam intensity 4.9E7 particles

           Target density - 5.27E11 atoms/cm2

22:05

The energy is changed to 247.4 V.

Read back value is 246.849 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

horizontal beam position 8.75 mm

vertical beam position  -5mm

Beam intensity 4.0e+7 particles.

Run is R67. Target temperature is 36..6 K.

Values of E1 is 820 Hz, 2.4A, 8.69e-2 mbar,  2.55e+11/cm2. The pressure is slowly increasing since this afternoon. The recent value is E1 is 820 Hz, 2.4A, 9.0e-2 mbar,  3.28e+11/cm2

Systen checks all OK

Attachments

13.39 DSSSD bias & leakage current OK

FEE64 temps OK

ADC data item stats OK

per FEE64 Rate spectra

Merger, TapeServer et

 data file R65_11

DSSSD bias & leakge current log

CARME DSSSD motion control

15.45 Start data file G22-201/R66 
      Beam/target overlap test

10:47

The energy is changed to 247.4 V.

Read back value is 246.849 V.

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

horizontal beam position 8.75 mm

vertical beam position  -5mm

Beam intensity 3.0e+7 particles.

e-cooler export controls before/after energy change - attachments 1 & 2

New run is R65. Target temperature is 37.6 K.

Values of E1 is 820 Hz, 2.12A, 6.01e-2 mbar,  2.8e+11/cm2

12:34

Systen checks all OK

Target density stable at ~1.5e11 at/cm2

E1 = 6e-2 mbar, turbo is fine

13,38 CB reboots RHS CRYRING control computer (atppc017) - appears to be a now unavoidable system update/reboot

13.39 DSSSD bias & leakage current OK - attachment 3

FEE64 temps OK - attachment 4

ADC data item stats OK - attachment 5

per FEE64 Rate spectra - attachment 6

Merger, TapeServer etc - attachments 7-8

 data file R65_11

DSSSD bias & leakge current log - attachment 12

CARME DSSSD motion control - attachment 13

13.42 E1 turbo 820Hz 2.2A 5.2e-2mbar

Target 3.45e+11/cm2 T1 36.6K

Beam c. 3e+7

15:20

Stats OK. Temps OK.

Merger OK. Write to disk OK.

07.22 E1 pump 799Hz, 2.8A, 2.6e-1 mbar, 4.8e+11/cm2

07.24 DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats OK - attachment 3

      per FEE64 Rate spectra - attachment 4

      per FEE64 1.8.L spectra - attachments 5-6

      per FEE64 1.8.W spectra - 20us FSR - attachments 7-8

      Merger, TapeServer etc - attachments 9-10
       data file G22-201/R64_11

      DSSSD bias & leakage current log - attachment 11

      CRYRING hall temperature log - attachment 12

      CARME DSSSD position controller - attachment 13

07.57 all histograms zero'd


07.58 E1 pump 794Hz, 2.8A, 2.6e-1 mbar, 3.1e+11/cm2
08.55 E1 pump 785Hz, 2.8A, 2.74e-1 mbar, 4.8e+11/cm2. Therefore, the temperature is changed from 38.8 K to 38.4 K. Values of E1 is changed to E1 pump 782Hz, 2.7A, 2.95e-1 mbar, 6e+11/cm2
09.15 The temperature is further changed from 38.4 K to 38.0 K.  
09.25 Values of E1 is changed to E1 pump  780 Hz,  2.79 A,  3.0 e-1 mbar,  5.87 e+11/cm2
09.35 Values of E1 is changed to E1 pump  779 Hz,  2.79 A,  3.1 e-1 mbar,  2.07 e+11/cm2
09.45 Values of E1 is changed to E1 pump  778 Hz,  2.75 A,  3.0 e-1 mbar,  4.6 e+11/cm2
10.00 Values of E1 is changed to E1 pump   776 Hz,   2.78 A,  3.05 e-1 mbar,  5 e+11/cm2

Intervention by Uli. Reduced H2 regulator to c. 12 bar. Briefly opened exhaust to hasten recovery.

10.13 E1 820Hz 2.3A 7.7e-2mbar c. 2e+11/cm2
10.34 E1 820Hz 2.1A 6.2e-2mbar c. 1.2e+11/cm2 38K
      Beam c. 4e+7. Cooler set 247.3V, read 246.751V.

01:50

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target ~3E11

Injection ca. 3E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 247.3 V

Read value 246.75 V

Collector current 4.3A

Histograms and statistics zero'd. Code reset

Rates OK. Temps OK.

NOTE. Between 23:45 and 12:45 the electron cooler was off? We called HKR and they turned it back on. Are we using the same cooler settings? Is the cooler still definitely working properly? Ask Claude in the morning

02:30

The target density started to oscillate between 2e+10 and 3.5e+10. However, the pump speed seems to be stable.

03:50

The oscillations seems to deepend between 1e+10 and 6e+10. Additionally the E1 pump slowed down to 815. As Nikos suggested during the tuning, I tried to lower the temperature from 41K to 40.8K.

04:00 - 04:30

No major change was observed, thus I increased the temperature to 42.2K in order to try to get the pump to the nominal rotation. After 10 minutes, the pump slowed down to 810 and the pressure in E1 reached 2.2e-1. Since increasing the temperature seemed to have a negative effect, I slowly decresed the temperature with steps of 0.2 K, until reaching 40K. At this point, the E1 pump returned to 819/820, the pressure of E1 lowered to 1.6e-1 and the target density seems to be more stable with a value of 2.8e+11.

05:00

The target density started decreasing to 1.5e+10 and the pump speed slowed to 815. I've tried to lower the temperature to 39.8K, but the target density started to decrease. Thus I've set the temperature to 40.2K. The pump speed raised to 818 but the target density remaind at 1e+11 level with oscillations between 8.5e+10 and 1.5e+11. After some minutes, it started slowly increasing towards the 2e+11 region. The E1 pumping speed is stable at 818 and the pressure of E1 is 2.02e-1.

05:10

Electron cooler off, restarted 10 minutes after by calling HKK.

05:30

Target density at 1.5e+11, however, the E1 raised to 2.3e-1 and the pump speed decreased to 810. Since going down seemed to solve it, I decreased the temperature to 39.6K. After 5 minutes the E1 lowered to 1.9e-1 and the pump speed is going up (currently at 814). The target density is at the same level of 1.5e+11.

06:00

Again the target density started to go down, as well the speed of the E1 pump and the E1 pressure reached 2.3e-1. I lowered the temperature to 39.2K: the target density raised to approximately 3.8e+11 (and keeps going up), the E1 pressure lowered to 1.9e-1 and the E1 pump speed started increasing from 810 to 815.

06:30

The target density starting going down again, the E1 started increasing to 2.3e-1 and the E1 pump speed decreased to 810. I lowered the temperature to 38.8K, the density raised to 3.5e+11, the E1 pressure lowered to 1.9e-1 and the pumping speed starting increasing.

07:56 Gleb has taken the beam to try settings for the 5+ charge state. As soon as the target is ready, the 1+ charge state will be given back.

Detectors have been moved out for safety

08:10
      Run 63
   
      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4

      
09:55 
      Run 63 

      DSSSD bias & leakage current OK 

      FEE64 temperatures OK  

      ADC data item stats OK

      per FEE64 Rate spectra OK

10:30

Data rate appeared very high c. 2000 kB/s instead of the usual 200 kB/s.

Rate on first two ASICs of aida02 was high (~2 kHz) but rest of aida01-04 looked fine.

ASIC check load reduced rate back to normal levels. Data rate reduced back to 200 kB/sec.

New ADC offsets loaded into the CARME_Sort code

Aida03 appears to be down. Check load does not resolve issue. Moving detector arm does not resolve issue. No spike in leakage current observed. System checks appear OK.  Zeroing ADC data item statistics keeps aida03 at 606023857 items and does not zero.

Issue resolved by resetting the data links for aida03

13:20

DSSSD bias & leakage current OK

FEE64 temperatures OK

ADC data item stats OK

per FEE64 Rate spectra OK

21:30

Waiting for the target.

Beam has been running, we have been running without storage.

See attachment showing beam stripe on the detectors.

Run 63 continued

22.06 DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachments 4-5
       aida16 producing HEC data, ASIC check load to clear


23.56 DSSSD bias & leakage current OK - attachment 6

      FEE64 temperatures OK - attachment 7

      ADC data item stats - attachment 8

      per FEE64 Rate spectra - attachments 9

       aida01-aida04 high ADC data item rates - left DSSSD motion cycle required to reset


03.28 DSSSD bias & leakage current OK - attachment 10

      FEE64 temperatures OK - attachment 11

      ADC data item stats - attachment 12

      per FEE64 Rate spectra - attachments 13

       aida01-aida04 high ADC data item rates - left DSSSD motion cycle required to reset


07.50 DSSSD bias & leakage current OK - attachment 14

      FEE64 temperatures OK - attachment 15

      ADC data item stats - attachment 16

      per FEE64 Rate spectra - attachments 17

       aida01-aida04 high ADC data item rates (see above) appears to have resolved itself or has been resolved (but not logged)

21:00

Claude has achieved optimal cooling parameters for the beam

No target and internal work inside the cave tomorrow is required

Run 63 going - beam only background

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS fakemotion script running

High rates on top left dssd again. Cycle left servo motor two times resolved issue

Rates OK. Temps OK.

Target has been moved out and H2 switched off. Changed to He.

Nikos will repair nozzle tomorrow morning. Remote checks until then.

Beam optimization and target change

New run 61

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 4E11

Injection ca. 3E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 244.95 V

Read value 244.4 V

Collector current 4.31A

Histograms and statistics zero'd. Code reset

Rates OK. Temps OK.

10:24

We lost the beam for 5 minutes. No counting spike observed when we got it back.

1L10

We lost the beam again for 5 minutes, but no counting spike obsevered when we got it back.

11:50


      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4
      
      Beam intensity - ~ 3.3E7 pps

      Target density - 5.14E11 atoms/cm2

12:00 - 12:40

Large fluctuations in the target pressure, going down to 1e-9. We increased the temperature a little but it did not solve the problem.

Increased pressure 0.5 K more. Seems more stable

13:09

FEEs on det 2 stopped working. Checkloaded. Fixed.

No beam.

05:36

Run started.

Conditions as before, except left servo now really in.

06:24

Run continues OK, file R60_9

Temps OK. Stats OK. Merger OK. Write to disk OK.

System wide checks as usual.

07:30


      DSSSD bias & leakage current OK - attachment 4

      FEE64 temperatures OK - attachment 5

      ADC data item stats - attachment 6

      per FEE64 Rate spectra - attachment 7
      
      Beam intensity - ~ 4.8E7 pps

      Target density - 7.25E11 atoms/cm2
      

9:20


      DSSSD bias & leakage current OK - attachment 8

      FEE64 temperatures OK - attachment 9

      ADC data item stats - attachment 10

      per FEE64 Rate spectra - attachment 11
      
      Beam intensity - ~ 4E7 pps

      Target density - 7E11 atoms/cm2
      

21:32

New run 59

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 4.7E11

Injection ca. 4E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 244.85 V

Read value 244.3 V

Collector current 4.31A

Histograms and statistics zero'd. Code reset

Rates OK. Temps OK.

22:44

Screenshots of the above

23:00

Detector 0 shows usual strong noise. Shook twice. Fixed it. Beam loss in correspondence with this event.

Beam mostly recovered a few minutes later.

23:28

Detector 0 shows noise. Shook twice with servo. No result. Shook with pneumatic. Fixed. Some beam instabilities again.

01:00

Temps OK. Rates OK.

Merger OK. Write to disk OK (file 59_13)

01:36

Detector 0 shows usual strong noise. Shook it. Fixed it.

01:46

Detector 0 shows noise. Shook twice with servo. No result. Shook with pneumatic. Fixed.

The noise increase is definitely correlated with spikes in YRT1DT1MK current reading. Unclear what the reading is.

02:36

Target density has been consistentyl above 1E12 recently, very unstable and trending forward. Increased Lakeshore setpoint by 0.5 K.

Density decreases to high 1E11, and appear significantly more stable. E1 pressure reading also decreasing to 1E-1 mbar.

Temps OK. Stats OK. Merger OK. Write to disk OK.

03:58

Temps OK. Stats OK. Merger OK. Write to disk OK.

Target still unstable and now a bit too low density. Trying to slowly lower the temperature in 0.1 K steps.

04:55

Temps OK. Stats OK. Merger OK. Write to disk OK.

Target around 6E11 atoms/cm2, with Lakeshore temperature at 30.8 K. Waiting for it to stabilise.

05:34

Detector 0 noisy. Shook. Fixed it.

Realised I had not moved the detector back at 01:46 after shaking it. Most of this run has been taken with detector 0 fully out, i.e. 18.86 mm.

Moving in and moving to a new run.

Ion beam energy is calculated using Beamcalc (https://web-docs.gsi.de/~lestinsk/beamcalc/electron.php)

Electron current is set to 4.3 mA and can be taken from Grafana

Alpha factor is 50

Ion energy is then adjusted using the cooler voltage

The cooler voltage inserted into BeamCalc is taken from the FC20 voltage divider. However an offset from the space charge correction is required!

This correction is determined experimentally by changing the electron current and finding the cooler voltage which maintains the optimum cooling of the beam.

Attachment 1 shows this plot for 15N1+ at  ~0.426 MeV/u

Attachment 2 shows this same plot in comparison with BeamCalc

To obtain the correct energy we need to subtract 2V from the voltage used in BeamCalc

An example is shown in attachment 3

Here to obtain an ion energy of 426.6 keV/u requires a cooler voltage of 246.7 V. But, due to the space charge correction this value should be 244.7 V.

The cooler voltage setpoint should therefore be chosen so that the FC20 voltage divider reads 244.7 V.

The setpoint needs to be ~0.55 V higher than the desired value i.e setpoint of 245.25 V to obtain the required 244.7 V (at least this beamtime it does)

15:30

Merger OK, Tape server OK

ADC data item statistics OK

FEE temperatures look OK

System checks OK

20:20

Merger OK, Tape server OK

ADC data item statistics OK

FEE temperatures look OK

System checks OK

13:53

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4
      
      Beam intensity - ~ 5.0E7 pps

      Target density - off

08:26: There is no beam and Gleb is informed.

08:46: Beam is back.

06:45 New data file G22-201/R57

      Right arm at 64.60 mm

      Left arm IN at 36.54 mm

      horizontal beam position 8.75 mm

      vertical beam position -5mm
   
      Changed electron cooler set point to 244.4 V

      Read value 243.851 V

      Collector current 4.31A


      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4
      
      Beam intensity - ~ 5.7E7 pps

      Target density - 2.91E11 atoms/cm2

8:35


      DSSSD bias & leakage current OK - attachment 5

      FEE64 temperatures OK - attachment 6

      ADC data item stats - attachment 7

      per FEE64 Rate spectra - attachment 8
      
      Beam intensity - ~ 4.8E7 pps

      Target density - 2.86E11 atoms/cm2
      
      There is no beam since 8:26 and Gleb is informed. 08:46: Beam is back.

10:49


      DSSSD bias & leakage current OK - attachment 9

      FEE64 temperatures OK - attachment 10

      ADC data item stats - attachment 11

      per FEE64 Rate spectra - attachment 12
      
      Beam intensity - ~ 4.0E7 pps

      Target density - 3.66E11 atoms/cm2


13:18


      DSSSD bias & leakage current OK - attachment 13

      FEE64 temperatures OK - attachment 14

      ADC data item stats - attachment 15

      per FEE64 Rate spectra - attachment 16
      
      Beam intensity - ~ 5.0E7 pps

      Target density - 5.67E11 atoms/cm2
      



     

23:15 New run 56 with

      Right arm at 64.60 mm

      Left arm IN at 36.54 mm

      MBS working - hopefully

      Target 4E11

      Injection ca. 4E7

      horizontal beam position 8.75 mm

      vertical beam position  -5mm
   
      Changed electron cooler set point to 244.3 V

      Read value 243.757 V

      Collector current 4.31A

      Rates OK. Temps OK

00.30 DAQ continues file G22-201/R56_9

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2

      ADC data item stats - attachment 3

      per FEE64 Rate spectra - attachment 4

      Merger etc - attachment 5

      DSSSD bias & leakage current log, CRYRING hall ambient temperature log - attachments 6-7

01.30 Photographs of current CRYRING controls - attachments 8-14


01.30 DAQ continues file G22-201/R56_14

      DSSSD bias & leakage current OK - attachment 15

      FEE64 temperatures OK - attachment 16

      ADC data item stats - attachment 17

      per FEE64 Rate spectra
       aida16 asics # 1 & # 2 HEC data - attachment 18
       aida16 ASIC load check x2 restores normal operation - attachment 19

      target 5e+11 stable, beam 4e+7 stable 

02.45 beam off - reported to HKR

      DAQ continues file G22-201/R56_16

03.00 beam back

      beam 4e+7 stable, target 5e+11 stable

      DSSSD bias & leakage current OK - attachment 20

      FEE64 temperatures OK - attachment 21

      ADC data item stats - attachment 22

      per FEE64 Rate spectra - attachment 23


04.20 DAQ continues file G22-201/R56_21

      DSSSD bias & leakage current OK - attachment 24

      FEE64 temperatures OK - attachment 25

      ADC data item stats - attachment 26

      per FEE64 Rate spectra - attachments 27

      Cycle L DSSSDs per https://elog.ph.ed.ac.uk/CARME/603


06.04 DAQ continues file G22-201/R56_21

      DSSSD bias & leakage current OK - attachment 28

      FEE64 temperatures OK - attachment 29

      ADC data item stats - attachment 30

      per FEE64 Rate spectra - attachments 31

      beam 4e+7 stable, target 4e+11 stable

14:45

New run 55 with:

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 7E11

Injection ca. 5E7

horizontal beam position 8.75 mm

vertical beam position  -5mm

Changed electron cooler set point to 244.2 V

Read value 243.66 V

Collector current 4.31A

Rates OK. Temps OK.

15:00

Detector 0 was noisy. Shook arm. Fixed it.

16:15

Detector 0 was noisy. Shook arm. Fixed it.

There is no beam in CRYRING since 16:05.

16:25

The beam is back but it is still a bit unstable and the operators are still trying optimize it.

17:20

We just did standard detector/electronics checks. Everthing looks OK.

17:50

Take screenshots.

20:50

Detector 0 was noisy. Shook arm. Fixed it.

But now detector 2 seems to have lost the Rutherford peak.

Screenshots taken and attached.

21:05

We did "Check ASIC Control" following Carlo's advise. This fixed the detector 2, but the detector 0 got noisy again. Another movement of the detector fixed the noise again.

22:15

Detector 0 was noisy. Shook arm. Fixed it.

23:05

This run has finished. The cooler voltage will be increased by 0.1V for the next run.

The latest spectra and detector/DAQ status are in the attachment.

Target density this morning had stabalised at 7e11 at/cm2

This is sufficient to test the beam/target overlap using the lifetime of the beam in the ring.

Previous attempt at this method was done at 1.5e11 at/cm2 where lifetime from residual gas and target are essentially the same.

Beam set to bunched. Beam position varied by 1mm and the number of particles in the ring taken from Grafana plots. Particles at injection compared with at dump.

Significantly more beam loss at > 8 mm beam position with highest value at 8.75 mm. This is the maximum we can move the beam.

Test repeated with no target. Same beam loss rate for all positions. We see a clear difference with the target only at positions > 8mm.

Test repeated with original electron cooler voltage Gleb tuned with last night. Same outcome -> cooler voltage has no significant impact on overlap (for 0.1V at least)

Overlap using count rate over 7.5 minutes also tested. DSSD 1 (top right) used as gauge as no beam stripe is seen in this detector. 

At horizontal position 4 mm (previous estimation of overlap) we saw a small increase in counts around 4.7 MeV with the target off compared to target on (76 vs 57)

At horizontal position 8.75 mm we saw a large decrease in counts around 4.7 MeV with target off compared to target on (95 vs 290)

It appears clear the overlap is at 8.75 mm. Future runs will use this as horizontal beam position.

09:30

New run 54 with:

Electron cooler setpoint 244.1 V

Electron cooler read 243.55 V

Collector current 4.3 uA

Right arm at 64.60 mm

Left arm IN at 36.54 mm

MBS working - hopefully

Target 7E11

Injection ca. 5E7

horizontal beam position changed to 8.75 mm

vertical beam position still -5mm

10:30

No beam

ADC stats increased to 250k again same time as beam lost

Detector shake resolved problem

System checks OK

10:35

Beam back

12:17

All system checks OK

12:29

DSSD top left noisy again. Detector shake resolves issuie

14:02

Running smoothly. Temps OK. Stats OK, but write to disk rate x10 usual for unclear reasons.

Target mostly stable. Beam OK, missing some injections occasionally.

14:25

Detector 0 noisy. Shook. Fixed it.

New run 52 with:

Electron cooler setpoint 244.2 V

Electron cooler read 243.66 V

Collector current 4.3 uA

Right arm at 64.60 mm

Left arm IN at 36.54 mm

Target 2E11 fluctuating

Injection ca. 5E7

22;00

Detectors moved out while HKR plays with the beam injection to improve its stability

22;56

All system checks good. Detectors still out. Stats in attachment 1

23:08

HKR still has to call, but I have put detectors back in since they are only operating on injection.

Noticed that from time to time the target density still sparks to E12, and this corresponds to when the temperature drops.

23:42

HKR called back, they found the problem and fixed it. Beam seems more stable, with injections at ca. 5E7

23:50

DSSD0 high stats, cycled the motors to clear them.

00:18

All system checks are fine. Attachment 2-3 with stats and a spectrum

00:38

Spikes in the target got more frequent. Increased temperature to 30.5K and monitor if it helps stabilizing it.

01:52

All checks OK. Target behaving, density 5-8E11.

Attachments 4-5

03:10

System checks OK.

Target consistent

Some beam outages which were quickly fixed by HKR

05:03

System checks OK.

Target consistent

07:00

Lost beam. Detectors moved out

Will likely end run once beam is back and change energy. Do not use data past 7 am

All system checks OK

Interactive Motion Program [workspace 6, display 2]

c                         stop current command(s)
l s by -20 mm             confirm y at prompt
l s by 20 mm              confirm y at prompt
read FakeMotion.dat       confirm y at prompt

15.40 DSSSD bias & leakage current OK - attachments 1-2
       log shows variations due to ambient temperature changes in CRYRING hall

      FEE64 temperatures OK - attachment 3

      WR timestamps OK - attachment 4

      System wide checks Ok *except* global clock (aida16) - attachments 5-6

      ADC data item stats OK - attachment 7

      per FEE64 Rate spectra - attachment 8

      per FEE64 1.8.L spectra - attachments 9-10
       have not been cleared in some time probably - will zero histograms & stats for later review

     per FEE64 1.8.W spectra - 20us FSR - attachments 11-12

     Merger, TapeServer etc - attachments 13-14
      data file G22-222/R51_15

     Motion control - attachment 15

16.01 all histograms & stats zero'd

16.43 online per DSSSD energy spectra - attachment 16

      photographs of CRYRING beam & target diagnostics - attachments 17-22

18.45 Left DSSSDs cycled to clear high rates (c. 250k/FEE64) aida01-aida04 per https://elog.ph.ed.ac.uk/CARME/603

18.49 DAQ continues data file G22-201/R51_27

      DSSSD bias & leakage current OK - attachment 23

      FEE64 temperatures OK - attachment 24

      ADC data item stats OK - attachment 25

      per FEE64 Rate spectra - attachment 26

      online per DSSSD energy spectra - attachment 27

19.00 Beam less stable but most cycles 5e+7 or higher
      Target peaking c. 1e12 dropping to c. 6e11

19.09 CRYRING hall temperature increasing, DSSSD leakage current increasing - attachments 28-29


20.06 Beam less stable most cycles 1-2e+7 or higher
      Target c. 1-2e12

20.15 JM/CB advise changing Lakeshore 336 Temp Controller set point from 29k to 29.5K - done
      Average pressure decreases but rapid variations still observed - see attachment 30


21.00 contacted HKR to improve beam stability - they were alreday working on it but did not know what was causing the problem - will contact on-call CRYRING expert

      cycled L DSSSD to reset rates
      
21,10 beam 0ff - DSSDs OUT

      Increased target temperature to 30K to solve instability that developed again up to E12 density range.


      


 

11:13

ML enabled ring signals remotely.

Used FakeMotion.dat (read FakeMotion.dat from InteractiveMotion.x).

Started run 50.

Cooler voltage moved up by 0.1 V. Did not refocus.

Setpoint = 244.4 V

Read = 243.85 V

Collector current = 4.3 mA

Target thickness 3.4E11 atoms/cm2 now stable

Injection 1-4E7 ions

Realised motors were not in.

Moved detectors in (36.54 / 64.60 mm)

Started run 51. Ignore run 50.

11:46

Realised the left half of DSSD BL was not counting. Checkloaded. Fixed it.

12:00

Fire alarm? Stopped later. EM thinks it is a test.

13:00

Run continues.

Rates OK. Merger OK. Writing to disk back to 200 kB/s. Nothing changed, reasons unclear.

FakeMotion.dat continues

System wide checks as before

Temperatures OK

13:36

Beam lost. Called HKR. Detectors out. Run continues. FakeMotion stopped

14:09

Beam is back. Detectors back in. FakeMotion.dat restarted.

15.10 High rates observed aida01-auida04 ( c. 250k/FEE64)

          Cycled Left Servo

         Rates normal

07:00

After putting the target back, we observe strong periodic (5 s) fluctuations going from 3E11 to 5E12. The reason is unclear. One may warm up the target to solve this, but will ask Nikos later instead.

The target may be a bit too thick for our purposes, and the luminosity will vary greatly depending on injection vs. target fluctuations timing.

Rates OK. Temperatures OK. Merger OK.

System wide checks as before.

07:30

Moved detectors fully out to check elastic and signal rate in this configuration.

Half of DSSD BR was missing. Checkloaded. Solved.

Moved to run 48. Target still unstable.

08:23

Beam issues. Called HKR. Target out.

09:00

Still no beam. Increased target temperature to 29K from 28.5K. It seems the fluctuations disappeared.

Rates as before.

10:22

Beam might be back but people are checking the steerer. Target in. Started run 49. Detectors still out.

10:13

Some beam. HKR is still working on it.

Data rate up to 2 MB/s. Merger events merged matches. However Stats do not seem to have increased. This is the second time I observe this.

RUN 46- started at 00:50

Horizontal beam position = 4.0 mm, vertical beam position = -5.0 mm.

Detectors are Left arm OUT = 36.64, right arm IN =  64.60 mm

Injection at ca. 6E7

Target density 6-7E9

-----

00:51

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 1-2

01:19

Attachments 3-4 waveforms. DSSD0 stats fine

01:33

DSSD0 stats fine

Attachments 5-6 spectra and xy, but I am not sure at which time these are cause I am stupid and apparently the AIDAsort code was not running....

01:56

Restarted the AIDAsort code and noted that stats in DSSD0 were bad again. Another shake. This time no change to the beam on my side.

2:43

All checks fine. Attachments 7-10 (also spectra)

4:01

Notice stats on DSSD0 went bad again. Attachment 11. Gave detector a shake.

Now all system checks OK (Attachements 12-14)

4:19

Just noticed target is oscillating a bit, hitting 1E10. I moved it further in X and Y. Seems to not go below 6E9 in any case.

NOTE: target was on at x=-19899 y=500.

5:17

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 15-18 (also waves)

5:53

Notice stats on DSSD0 went bad again. Gave detector a shake.

6:10

Stats ok in attachment 19, but

Noticed DSSD3 has started to get only a fate of 140 nstead of previous 5500is (similar to what DSSD2 has done earlier- see previous elog). Attachment 20 for the rates.

I have therefore made the Check ASIC control test from the ASIC control tab- attachment 21 with results.

DSSD3 back to normal operations - attachment 22

Tried to double check beam-target overlap by changing beam horizontal coordinate.

In the tablethe counts in the 4000-5200 keV region in each of the detectors are recorded. Counts were taken for a total time of 5 minutes per beam position. Attached are the xy plots.

I think the tests are inconclusive given that the beam in the first three points were not ideal, with many low intensity injections. Moreover, changing the beam often ends up causing the stats in DSSD0 to rise significantly (consequentely needing to shake the detector to go back to normal operation).

After fixing DSSD2, statsin DSSD0 went up again. Stopped the test after shaking again the detector.

----

I have put back the beam at 4mm horizontal. I switched off the target by moving it to x=-10000--->x=-5000 (previosuly X=-19800). Denisity went down to 5E9. However, I decided under Jordan's suggestion to make another test and I put the target back to x=-19800: interestingly the density went up to 5E12 and start oscillating for a while between 5E12 and 5E11.

I did a 10 minute check of counts in the 4000-5200 keV region with this configuration, then switched off the target and did another 10 minutes test. Results:

Re-increase in DSSSD leakage current c. 14-15.00 6.6.24 

There was a significant temperature spike in the CRYRING hall on the afternoon of 6.6.24 which has, partly, recovered - see attachment 1

15:35

Electron cooler voltage set point = 244.3 V

Electron cooler voltage readout = 243.75 V

Collector current = 4.29 mA

All system checks OK

Cycle time = 6 s

Detector positions: left = 36.54 mm, right = 64.60 mm

Target density = 2.5e11

Injection = 3 - 4 e7 pps

15:50

Injection intensity dropped to 1e7 pps

15:54

Injection intensity back to ~4e7 pps

17:30

All system checks OK

Target at 3.7e11

Beam dropped to 1e7 pps

17:34

Beam back to 3-4 e7 pps

19:10

Beam started varying between 1e7 and 4e7. The operators briefly closed the Faraday cup (~30 seconds), the beam is now back to ~5e7

19:25

All system checks OK

Target at 2.6e11

Beam at 5e7

21:25

All system checks OK

Target at 2.7e11

Beam at 4-5 e7

11:05

Confirmed overlap is at 4 mm under new settings.

For unclear reasons, the bottom-left detector is not seeing the halo anymore since around 10:00. Rutherford still visible and if the left arm is moved in the counts at 5 MeV become apparent.

l s by 20 mm, r p in -> 36.5 mm /  64.6 mm

Target thickness 3E11 atoms/cm2. Beam intensity few E7 at injection. Coasting beam mode.

Data rate x10 compared with earlier. Stats as before - the reason is unclear.

Temps & Merger OK. We should be able to tolerate these rates.

Moved detectors in/out to make sure we were not clipping the beam. A few seconds of data may be present in R41_9

11:30

Checkloaded. Detector 2 is now counting more.

Moved to run 42. No other changes.

13:00

Realised cooler voltage was being read via fault g35 divider. Beam stopped

15:00

Switched to F20. Beam back on. Moved to run 43

Electron cooler voltage = 243.155 V

Collector current = 4.29 mA

Beam energy was slightly off, will try again

Started run 39.

We have the 15N+ beam with 426 keV/nucleon. We see a peak in detector top left (mostly) and bottom right, at 4600 keV. We think it is the beam (nominally 6400 keV) after going through silicon dead layer, which however seems to be thicker than expected (expected 0.7 um, but given 1.4 MeV/um energy loss it seems to be > 1 um).

To understand what was going on we first played with detector and beam position.

At 17:28 detectors are fully out, while we are playing with the electron cooler to try to remove this beam halo hitting the detector.

Detector DSSD0 top left periodically seems to get noisier (statistics up to >2E5) and we need to move the detector in and out to go back to normal operations.

------------------

The beam halo in top left detector, as the detector gets moved in, gets elongated in the y direction instead of the x direction, as expected and previosuly observed.

Run 40 started.

18:36

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 1-4

19:43

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 5-8

21:15

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 9-11

00;25

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

-----------------------------------

Movements and observation in xy plot:

- Move right servo in by 20 mm and we see the halo in the top right moving accordingly (attachment 12)

-Move right pneumatic in, saw big increase on bottom right (attachment 13)

-moved beam position down vertical -6 mm and we see reduced beam spot on top left and more on bottom left

-----------------------------------

Beam - target overlap:

We have yet to obtain an overlap

We cannot do this using the beam lifetime as from beam calc the lifetime from the ring is comparable to the lifetime with a target of 1e11 at/cm2

We have tried using Rutherford. However, we will have to move the detectors IN further as the Rutherford peaks at ~3.8 deg.

Possibly we may require other overlap detections from the ring?

I also think the beam requires some optimisation, electron cooler voltage seems to be fluctuating a lot and we see some features on the detectors when moving the beam / detectors as mentioned above.

02:25

The beam intensity has decreased signficantly (by about a factor of five) since about an hour. Operators tried different things, also consulted with Frank Herfurth, but they could not solve the problem.

There is no device which indicates malfunction.

So, during the rest of the night shift we will continue searching for the overlap (of the beam with the target) with the available beam intensity.

03:30

The beam intensity has improved without any aparent intervention.

We have started a new search for the overlap with 20 minute runs per horiznotal beam position.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

03:40

After changing the horizontal beam position from 0 mm to 1 mm, the bottom right detector lost the Rutherford peak and its position spectrum looks to be half empty.

Moving it OUT and IN again did not change the situation.

There is no reason to think that this behavior has been caused by moving the beam by just 1 mm.

04:10

The beam intensity has dropped again without any apparent reason. So, at the moment we can not continue search for the overlap.

The bottom right detector seems to be counting normally again (also without any apparent reason). 

06:45

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

07:18

Lost beam again. Gleb is looking for it. Moved right detector out temporarily.

System wide checks as before.

Merger OK, Tape Server OK.

Temperatures OK.

Rates currently OK.

Leakage current decreasing.

10:10

Beam is back. Target is unusually thick at 3-5E11

Checking beam overlap.

Merger & tape server OK.

Temps OK.

Rates OK, a bit higher in 01 and 04.

06:45

All system checks OK

Target density 3.4e11

11:50

System checks OK.

No beam in the ring yet. Althoug some injection may be taking place at low intensities

Target density appears much more stable than before.

Density currently just above 1e11 at/cm2

Note maintanace is required to appc025 so anydesk is currently down.

13:13

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 1-5 (also waveforms)

15:00

Merger OK, Tape server OK

ADC data item statistics DO NOT looks as before. NOT OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachments 6-8

15:16

Notice the statistics for aida01-aida04 (DDSD 0, top left) were counting extremely high in the previous check (attachment 6). Previous rate was 0-1 counts.

We tried ASIC check load three times but not effect on the rate.

We then tried 'shaking the detectors' by moving the left pneumatic in and out again.

Rates go back to normal levels (0-1 counts)

14:20

Target nozzle currently being replaced. No beam

We have decided to switch to 15N beam from now on.

Beam energy for 15N is significantly higher than deuteron beam so we have increased the thresholds (slow comparator) slightly for all detectors to 500 keV (0x32).

ADC data item rates - attachment 1

Run 37 started. Alpha background

Data rate ~ 200 kb/sec

17:44

All system checks OK

20:00

All system checks OK

23:30

All system checks OK

01:25

All system checks OK

03:25

All system checks OK.

Target is stable at 3.5e11, with T1=29 K

05:30

All system checks OK

Target density has slowly drifted down, and is now 1.2e11

14:00

Access to the cave as Nikos and Andreas have begun work on the target.

Run 36 started - pulser walkthrough.

Pulser amplitudes of 8, 7, 6, 5, 4, 3, 2, 1

Attachment 1 - pn channels

Attachment 2 - nn channels

Attachment 3 - pn channels (zoom)

Attachment 4 - nn channels (zoom)

Best pn channel looks like AIDA09 - pulser width 63

Worst pn channel looks like AIDA14 - pulser width 148

Best nn channel looks like AIDA12 - pulser width 58

Worst nn channel looks like AIDA16 - pulser width 246

This is approximately the same as pulser widths before the beam time.

09:30

Target density has not improved despite efforts last night. Mid 10 - low 11 density range. We will try to change the nozzle.

Target nozzle moved to the out position.

HKR allowed access to the cave to turn the compressor off. Target nozzle now warming up.

Internal cave work on changing nozzle expected to start at ~11. In the meantime we will let Wolfgang experiment with the beam settings to try to improve injection intensity.

Detectors have been moved out to fully out position

Run 35 started.

1) STOP DAQ [workspace 2, display 1, browser tab 'Run Control']
   all FEE64s should change status from 'going' to 'stopped' *except* whichever FEE64(s) have a problem - typically their status is 'going' or 'error'

2) Restart Merger by selecting the Merger icon [workspace 3, display 2]
    terminal window showing the startup will popup

3) Setup Merger by selecting 'SETUP' [workspace 3, display 1, browser tab 'NewMerger Control']

4) Start Merger by selecting 'GO' [workspace 3, display 1, browser tab 'NewMerger Control']
     all data links will be inactive (red)

5)   Disable data transfer by selecting 'Data transfer Disable #1 all' [workspace 2, display 1, browser tab 'Run Control']

6) Start DAQ

    Start DAQ by selecting 'GO' [workspace 2, display 1, browser tab 'Run Control']
     check that DAQ is *actually* going - if not repeat 'GO'

7) Check WR timestamps by selecting 'Collect all timestamps' [workspace 2, display 1, browser tab 'GSI White Rabbit Control']
     readout times will be displayed for each FEE64
     check that the readout times are monotonically increasing as you read down the list of readout times - if not, contact expert support

8) Stop DAQ 

    Start DAQ by selecting 'STOP' [workspace 2, display 1, browser tab 'Run Control']
     check that DAQ has *actually* stopped - if not repeat 'STOP

9) Enable data transfer to Merger and TapeServer and start DAQ

    Enable data transfer by selecting 'Enable data transfer Enable #1 All' [workspace 2, display 1, browser tab 'Run Control']

    Start DAQ by selecting 'GO' [workspace 2, display 1, browser tab 'Run Control']
     check that DAQ is *actually* going - if not repeat 'GO'

10) Check data is being transferred to Merger and TapeServer

    Select 'Reload' [workspace 3, display 1, browser tab 'NewMerger Control']
     you should see a non-zero 'current merged data rate' and all links should show as green at least some of the time (requires observation over several reloads)

    Select 'Reload' [workspace 3, display 1, browser tab 'TapeServer']
     you should see 'Blocks written' and 'kb written' counters increase

11) Check AIDA data is being forwarded from the TapeServer to MBS [workspace 3, display 2, command terminal]

12) Restart should now have been successfully completed. Please inform the 'on shift' crew' that AIDA is forwarding data.

    If not, please request expert assistance.

19:08

Beam energy = 3 MeV.

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Target density ~ fluctuating

Beam intensity at inj ~ 1.7e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

MBS signals saved from motors code

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 6 minutes.

Pressure in YR09 E target ~ 4.36e-11 mbar.

Merger error recovered

White rabbit time stamps

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

21:27

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

23:00

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Statistics attachment 5

Merger attachment 6

00:42

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Density is oscillating between E10 and low E11.

attachment 7 is statistics, attachment 8 is temperature, attachment 9 is merger, attachment 10 is spectrum browser.

02:20

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Density is oscillating between E10 and low E11. ( last 15 minutes below 2E10)

attachment 11 -13

From 2:00 target density falls below 2E10 and started decreasing to the E9 range. At 2:40 we started playing with x-y to get to higher density. At 3:30 we are at 5/6E10 and waiting to see if it stabilizesto that or if it needs more playing.

04:06

Target density being 1-2E11 since 5 minutes

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachment 14 statistics, attachment 15 merger

05;53

Target density 1E10, sometimes e11, before going down to low E10 and we need to play a bit with x-y to recover it

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Attachment 16-18

07:35

Target density 2.5E11, after changiny y position to 1000

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

09:00

Target density has not improved despite efforts last night. Mid 10 - low 11 density range. We have asked HKR to remove beam from the ring and allow access so Nikos can change the nozzle.

Beam off now, access granted. Will begin warming nozzle. Internal cave work on changing nozzle expected to start at 11

Run stopped.

Final monitoring code histogram attached

16:26

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Nicos came in to optimize target density.

18:39

aida02 in the MERGER aka aida03 elsewhere has a red background, but still appears to be transferring data. Rates are fine. Temps are fine. System wide checks unchanged.

See attachments. Checkloaded x2 - no difference. Unclear what the issue is.

15:15

Run 32 started - Beam, no target

Beam energy = 3 MeV.

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 5 minutes.

Pressure in YR09 E target ~ 4.5e-11 mbar.

Motors code crashed. Beam removed from ring to re-home detectors.

15:20

Beam in the ring again, detectors homed, no target

Detectors have been set up to send signals on injection / dump

15:35

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

8:13

Since 6:40 the target density dramatically dropped to 10^9 since then it has been unstable and did not recover. Currently it is around 8e8.

09:00

Target density has been increased to the high -10, very low -11 region. We will keep this run going unless the density is increased further.

10:21

Beam energy = 3 MeV.

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Target density ~ 1e9 at/cm2 (no target, get lost quite quckly)

Beam intensity at inj ~ 1.7e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 6 minutes.

Pressure in YR09 E target ~ 4.36e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

target density has been fluctuating between E9 to E12. We can very clearly see the increase in elastic counts on our detector during high density periods.

Attachment 1 - rate plots at 1E12 at/cm2

Attachment 2 - rate plots at 1E9 at/cm2

12:26

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

After reaching a density of > 10^12 a bit before 11:00, the valve got closed. When a valve is closed, can be observed a dramatic change in the plot and one of the three green ligths of atps7vaccrz1 (0,2,4) is turned off. Nikos opened it, and now it seems stable again around 1e11.

14:07

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

15:05

Run stopped as target density is rubbish. Might as well get beam background

Beam energy = 3 MeV

Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

Cycle time ~ 6 minutes

01:05

Target density still very unstable

02:45

Target density has dropped to ~1e9 and has been at that level for 30 minutes. We will try to move the target a bit and see if we can get an increase. Target position is currently x=-12400, y=2900

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

04:15

We were able to recover some target, but it is still very unstable. The new position is x=-12800, y=2000

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

06:15

Target still unstable, fluctuating around the 5e10 region

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Beam energy = 3 MeV

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 36.54, right arm =  64.60 mm

22:52 (Attachments 1 -3)

Beam is very unstable

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

00:47

Beam is still very unstable.

We checked for beam-target overlap position and found a clear increase in counts at beam position 4.0 mm. We have left the beam at horizontal = 4.0 mm, vertical = 0.0

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

16:15

In the previous run while working on the target it was discovered that the valve was closed! Probaly this happened around 10 am, we are not sure.

The gas target inlet valve is open again, working on the target.

Beam energy = 3 MeV

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN pneumatic only. Left arm = 62.71, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 7 minutes.

Pressure in YR09 E target ~ 4.5e-11 mbar.

18:03 ( Attchments 1 -4)

Still no target!

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

20:23

We have the target back. S1( grafana) 4.8e-8. The target thickness read by the system 5E11 atoms/cm2 but apparently the formula is wrong and the value should be almost e12 atoms/cm2.

. We have now proper beam and target and we

16:10

We start a new run after doing some test with the motor. Injection time is now a 6s, moving of the motors is working fine.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

No target

12:46 (attachments 1-4)

Run 27 started - Beam no target

Beam energy = 3 MeV

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN pneumatic only. Left arm = 62.71, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 7 minutes.

Beam on BPM looks to be better than at previous energy.

Pressure in YR09 E target ~ 4.5e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

13:45 (attachments 5-8)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

15:15(attachments 9-12)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Target density 1e10 atoms/cm2. Still working on the target.

09:44

Run 26 started - Beam no target

Beam energy is being increased from 1.5 to 3 MeV

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Detectors are positioned fully OUT

Histograms and stats zero'd, monitoring code restarted.

Pressure in YR09 E target ~ 4.5e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

10:48 (Attachements 1-4)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The detectors currently fully out for tuning.

11:57 (attachments 5-8)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The detectors currently fully out for tuning.

00:38

Run 25 started - Beam on target

Beam energy = 1.5 MeV.

Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Target density ~ 5e11 at/cm2 (Still Fluctuating, after temperature increase)

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 62.71, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 5 minutes.

Pressure in YR09 E target ~ 5.2e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

01:30 (Attachments 1 - 4)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density seems very unstable: fluctuations from 1e11 to 1e12 atoms/cm2 within 5min

02:37 (Attachments 5 - 8)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density is around 5e11  atoms/cm2 with small adjustments

03:32 (Attachments 9 - 12)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density is in average 5e11  atoms/cm2 with some small  adjustments. Max values up to 3e12 atoms/cm2

One of the injections at 03:43  was not ok and we lost beam for some min.  Target density 1e12 atoms/cm2.  On 04:00 the beam was back again without any operator intervention.

04:35 (Attachments 13 - 16)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density is in average 1e12  atoms/cm2.

05:43 (Attachments 17 - 20)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density decreased to 2e11 atoms/cm2 in the last 40 min

06:43 (Attachments 21 - 24)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density is fluctuating from 1e11 to 1e12 atoms/cm without any change....

07:53 (Attachments 25 - 28)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density is fluctuating from 1e11 to 1e12 atoms/cm without any change....

08:48 (Attachments 29 - 32)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

The target density is fluctuating from 1e11 to 1e12 atoms/cm without any change....

09:40 --> Run 25 stopped.

23:47

Run 24 started - Beam on target

Beam energy is 1.5 MeV.

Horizontal beam position = 7.0 mm, vertical beam position = -1.0 mm.

Target density ~ 1e11 at/cm2 (Still Fluctuating, after temperature increase)

Beam intensity at inj ~ 2.5e7

Detectors are positioned IN. Left arm = 62.71, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 10 minutes.

Pressure in YR09 E target ~ 5.2e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

00:23

Target density ~4.65e11 atoms/cm2

Beam intensity at inj ~ 2.7e7

Beam intensity dropped to 2.1e7 in 10 minutes. Proportionall this is much greater than before. 

Run 24 stopped.

Offline analysis data file G22-201/R22_0 to R22_11

Sort program variables https://elog.ph.ed.ac.uk/CARME/240530_180659/variables.dat

ADC data corrected for ADC offset but not gain

per DSSSD m_p verus m_n - attachment 1

For spectra below events must satisfy condition 0 < m_p < 8 *and* 0 < m_n < 8

per DSSSD p+n junction strip versus n+n Ohmic strip - attachment 2
 note - x/y channel ordering to be checked

per DSSSD E_p versus E_n - attachment 3
 20keV/channel nominal

per DSSSD E_p versus E_n - attachment 4
 gated w(1) & w(2)
 20keV/channel nominal

per DSSSD projection of gated E_p versus E_n spectra - attachments 5-8
 20keV/channel nominal

14:05

Run 22 stopped. Run 23 started we will now adjust the vertical beam position to see if we observe the beam stripe seen in the last beamtime.

Current vertical beam position 0.0 mm. Horizontal beam position 7.0 mm. Coasting beam.

Beam D+, 1.5 MeV. Storage time ~ 20 minutes. Target ON. Density ~1e11 at/cm2.

XY plot from run 22 with the same settings - attachment 1

Beam stripe looks like it is just on bottom detectors (just )

14:10

New beam settings

Vertical Beam position 5.0mm, Horizontal unchanged. Storage time reduced to ~2 minute

No real change observed. Perhaps some thing more can be seen on top right detector but definitely not like in the Feb experiment.

14:15

New beam settings

Vertical Beam position 9.0mm, Horizontal unchanged.

No real change observed again.

14:20

New beam settings

Vertical Beam position -9.0mm, Horizontal unchanged.

More events observed on bottom left detector but nothing like the Feb measurements. I think we do not have stripe effects like previously.

14:40:50

New Beam settings to check beam lifetime.

Vertical beam position set back to 0.0 mm. Horizontal unchanged

In bunched mode to observed intensity over time. 

Injection into ring 2.2e7

15:15

Beam intensity dropped to 1.1e7. Beam lifetime 35 minutes.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

15:24

We removed the target. Beam intensity at 2.2E7

After 35 minutes, the beam intensity is 1.41e7. So target does have effect on beam lifetime! We would like more.

16:05

We will now bring target back in and try to increase density.

16:10

Some sort of GSI-wide failure, we have lost beam entirely. We don't see any effect on our system. Temperatures and leakage currents are stable

Detectors moved fully out for safety

17:15

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

19:15

Still no beam

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

21:15

Still no beam

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

21:40

Beam has returned!

22:00

Target at around 9e11 and appears stable

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

22:33

Beam back in the ring. Beam settings to be updated.

Rates in right hand detectors look slightly different to before - lower in bottom right, slightly higher in top left. Perhaps beam vertical position needs to be lowered slightly.

ASIC check load just to be sure. Rates in aida15 greatly reduced - only temporarily.

09:47

12 seconds pre acc

200x cycles

Detector pneumatics IN, not moving

Running in this configuration for the rest of the shift

Target is barely 1E11 atoms/cm2 and keeps decreasing

Temps OK, checks OK, Stats OK

Writing to disk rate OK

11:22

Targets gets thinner and thinner <1E11 atoms/cm2

Temps OK System wide checks OK Merger OK

Rates OK

13:02

Temps OK. Target around 1E11 atoms/cm2

Merger OK

Rates OK

07:41

Switching to bunched beam to check D vs H content.

8:24

Attach 1&2

ONE spill

Detectors fully out

Switched to bunched beam

12 seconds pre-acceleration

100x cycles (600 seconds) -

Loss over 600 seconds 3.97E7 ions to 3.40E7 ions, i.e. negligible.

Attach 3&4

Coasting beam

12 seconds pre-acc

100x cycles

Attch 5&6

Coasting beam

12 seconds pre-acc

100x cycles

Detectors pneumatics IN

Attach 7& 8

Coasting beam

6 seconds pre-acc

100x cycles

Detector pneumatics IN

Attach 8&9

Coasting beam

12 seconds pre acc

200x cycles

Detector pneumatics IN

Running in this configuration for the rest of the shift

Target is barely 1E11 atoms/cm2 and keeps decreasing

22:56

Run 20 started - beam on target

Beam energy is 1.5 MeV. Horizontal beam position = 7.0 mm, vertical beam position = 0.0 mm.

Target density ~ 1e11 at/cm2

Beam intensity at inj ~ 4e7

Detectors are positioned IN. Left arm = 62.71, right arm =  64.60 mm

Histograms and stats zero'd, monitoring code restarted.

Beam in the ring ~ 3minutes.

Pressure in YR09 E target ~ 4.5e-11 mbar.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

01:15

Target density has increased slighty: ~ 4e11 at/cm2 (update: this only lasted about 5 min)

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

3:10

Target density has decresed slightly but will come back (hopefully) ~7e10 at/cm2.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

05:15

Target density has been somewhat unstable, between ~7E10 and ~3E12 at/cm2.

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

07:37

Run continues. Target density still fluctuating around 1E11 atoms/cm2.

Temperatures OK. Merger OK. Rates OK.

System wide checks as before.

Waveforms OK. See attachments.

Some screenshots from the online analysis. We do not see a peak at 1 MeV. We do however clearly see more D than H2+.

Stopping run to make some tests.

Offline analysis data file G22-201/R17

Sort program variables https://elog.ph.ed.ac.uk/CARME/240530_180659/variables.dat

ADC data corrected for ADC offset but not gain

per DSSSD m_p verus m_n - attachment 1
 DSSSD #2 spectrum is normal, DSSSD #1 and #3-4 display large multiplicities in p and/or n strips which are, presumably, non-physical events at DSSSD edge

For spectra below events must satisfy condition 0 < m_p < 8 *and* 0 < m_n < 8

per DSSSD p+n junction strip versus n+n Ohmic strip - attachment 2
 note - x/y channel ordering to be checked

per DSSSD E_p versus E_n - attachment 3
 20keV/channel nominal

per DSSSD E_p versus E_n - attachment 4
 gated w(1) & w(2)
 20keV/channel nominal

per DSSSD projection of gated E_p versus E_n spectra - attachments 5-8
 20keV/channel nominal
 log scale

Offline analysis data file APR24/R3 (alpha background)

Run started 11:04 26.4.24
Run ended   09:44 29.4.24

Sort program variables https://elog.ph.ed.ac.uk/CARME/240530_180659/variables.dat

ADC data corrected for ADC offset but not gain

per DSSSD m_p verus m_n - attachment 1

For spectra below events must satisfy condition 0 < m_p < 8 *and* 0 < m_n < 8

per DSSSD p+n junction strip versus n+n Ohmic strip - attachment 2
 note - x/y channel ordering to be checked

per DSSSD E_p versus E_n - attachment 3
 20keV/channel nominal

per DSSSD E_p versus E_n - attachment 4
 gated w(1) & w(2)
 20keV/channel nominal

per DSSSD projection of gated E_p versus E_n spectra - attachments 5-8
 20keV/channel nominal

2D spectra z contours/colour map - attachment 9

Morning shift

08:16 - as run 18, target off

9:00 Increased storage time to 5 minutes. Aquired data after initial beam loss. Attach 1 &2. Far less H2+ vs D.

Temps OK

Rates as before

10:00 beam being optimised to reduce 2H+ content

Rates in aida 13, 14 suddenly spike as during overnight. Checkloaded repeatedly. No effect. Increased thresholds in 13, 14 to 0x32 bringing them in line with 15,16.

12:50

We started test with beam

Test1 ( Attached 12-52-55)

Horiz. offset: 8mm

Max vuel on 1.5MeV =1480 counst

Test2

Horiz. offset: 7mm

Test3

Horiz. offset: 6mm

target density=2.4E11

Test4

Horiz. offset: 5mm

target density=from 1.7E11 to 2.5E11

Test5

Horiz. offset: 4mm

target density=from 5.6E11 to 1.1E11 several fluctuations

Test6

Horiz. offset: 3mm

target density=1.1E11 several fluctuations. Until now we do not see a clear  signel from the reaction!

Test7

Horiz. offset: 2mm

target density=1.1E11 several fluctuations.

Test8

 Beam back again. Coasting beam. Detectors IN

Horiz. offset: 8mm

xy and energy histograms - attachment 12 and 13.

Test9

Bunched beam Detectors IN

Horiz. offset: 8mm

xy and energy histograms - attachment 14 and 15.

Test10

Horiz. offset: 6mm

xy and energy histograms - attachment

target:1.6E11

xy and energy histograms - attachment 16 and 17.

Afternoon shift

From previous overlap tests we can see that moving the beam position does cause a change in the number of events observed in the detectors.

But the change in events appears to be due to beam halo hitting the detectors rather than elastic scattering. New approach required.

We have varied the beam position (horizontal) in 1mm steps from 0mm to 9mm (the maximum allowed). We do this with the target ON and then with the target OFF.

Integral of events ~1.5 MeV taken . Difference between the target and no target plotted to gauge overlap position.

Note we have moved left arm fully out as we were worried about beam hitting dssds on injection. Will check overlap with right dssds only as left dssds have very low rate at this position.

We have determined the overlap position is about 7.0mm horizontal

Attachment 18 shows initial scan.

Attachment 19 shows a second scan in the region we highlighted as possible overlap.

22:53

Run 15 started

Beam tests. We increased the storage time to 2min and switched to bunched beam so that we can see the beam lifetime over the cycle.

D+ Beam energy is set to 1.5 MeV.

Detectors are positioned in with servos only (left arm = 28.06mm, right arm = 29.23 mm)

No target

We observe a large peak at the start of the cycle at 750 keV. This seems to be molecular hydrogen circulating in the ring. We also see a much smaller peak at 1.5 MeV (D+)

After a period of time the 750 keV peak decreases significantly and we are left with the 1,5 MeV peak only. 

Total energy histogram after running for ~ 1 hour - attachment 1

Total xy plot after ~ 1 hour - attachment 2

We observe the large circular structure on the left hand detectors. Is this related to hydrogen or is it the beam type (bunched instead of coasting)?

In the GSI control plots for the number of ions in the ring we observe a large drop in ions circulating at the start of the cycle, and then remains fairly constant throughout the rest of the cycle. - attachment 3

This seems to confirm our hydrogen hypothesis.

23:54

Run 15 stopped, Run 16 started.

All setting the same and still no target, except beam is now coasting. We will compare to Run 15 after one hour of running.

We do not observe the circular distribution on the detector seen in the previous run. It seems this effect comes from the bunched beam. Reason?

We still observe the 750 keV peak at the start of the cycle.

Total energy histogram after running for ~ 1 hour - attachment 4

Total xy plot after ~ 1 hour - attachment 5

00:59

Run16 stopped. Run 17 started.

All settings the same except we have switched back to bunched beam.

Target now on. (X=-13700, Y=0). Target density ~ 1E11 at/cm2.

02:03

Run 17 continues

Target has increased in the average density to ~4e11 at/cm2, no changes made to nozzle position and fluctuates to 1e11 or 1e12 at/cm2.

Energy histograms and the xy plots appear similar to bunched beam with no target. The rates are slightly lower with the target for the left hand dssds, maybe target interactions destroy molecular hydrogen quicker?

Total energy histogram after running for ~ 1 hour - attachment 6

Total xy plot after ~ 1 hour - attachment 7

We will continue to run for another hour or so in this condition

Target density has decreased over the last minutes. We have tried to move the nozzle to maximise density but fluctuations make this difficult.

03:55

Increase in ADC data items statistics for aida 13 and 14 from ~20 kHz to 90 kHz

ASIC checkload has reduced the rates back to ~ 20 kHz

Total energy histogram after running for ~ 3 hour - attachment 8

Total xy plot after ~ 3 hour - attachment 9

Run 17 stopped. Run 18 started

Beam changed back to coasting. All other settings unchanged. Target on. 

04:55

Run 18 continues.

Energy histograms and the xy plots appear similar to bunched beam with no target. The rates are lower with the target than without.

Total energy histogram after running for ~ 1 hour - attachment 10

Total xy plot after ~ 1 hour - attachment 11

Note we observed fluctuations in the T2 temperature for the target. T2 is set to 80 K but rapid fluctuations were observed up to 100K. This occurred for only 5 minutes and I am not sure if it is a real effect.

07:20

Temperatures OK

System wide checks OK

Rates OK

Stats OK

Waveforms attached

Leakage current decreasing slightly.

No changes to beam or target.