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.

22:03

Before this run we checked quickly  beam with the target on but it does not make sense with the current status of the beam.

We removed target and starte Run14

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

20:00

The beam is set at the correct energy, operators cross-checked it again. What we see  at 750 is due to the molecular beam.  The operotors are trying to optimize and get rid of this in the next 30min.

Temps and system checks OK

Leakage current OK

Merger and tape server OK

Potentiometer at 28.06 mm and 29.23 mm

20:30

Keep going with the beam tests. A new peak appears around 950 keV( See attached). Still try to understand what it is. The operators keep going

07:00

Run 12 started. D+ beam is incident on the target at 1.5 MeV

Beam intensity in the ring is ~4e7 particles

Target density shows some fluctuations but is ~1e11 atoms/cm2. Target temp 35K

Detectors are positioned fully out (Left arm 18.86mm and right arm 19.8 mm ) and are not moving

Ring pressure looks OK, YR09 E target sensor seems unaffected by the target currently reads ~5e-11 mbar.

Beam is in the ring for ~15s.

Temps and system checks OK

Leakage current OK

Merger and tape server OK

Horizontal beam position 8 mm and vertical beam position 0mm for overlap with target.

Statistics - attachment 1

Energy histogram - attachment 2

XY plot - attachment 3

We see high rate at 1.5 MeV in left dssds but very little in right dssds. XY plots also show counts are concerntrated in a very circular distribution.

07:15

Gleb has just called and requires access to the cave to check on a turbo pump in the source.

Ring vacuum looks good

Beam will be down for 10-15 minutes only hopefully. 

07:45

Beam is back in the ring but injection requires optimisation.

09:00

There are some issues with the source that require a few hours to resolve. Potentially until 7 or 8 pm tonight. We have about an hour before work starts.

We have done a quick test of the motors and moved the left and right arms in using the pnuematic only.

New position left arm = 62.71 mm , right arm = 64.6 mm.

We observed the rates in left detectors went up significantly. In the right detectors we observed little increase.

See attached xy plot - attachment 4

See attached energy histogram - attachment 5

Beam intensity has dropped significantly - below 1e6 particles so even at in positons we see few counts at the moment.

09:25

Source has degraded pretty rapidly so beam will be stopped for now.

Detectors moved back out.

Target nozzle moved from X= -13000, Y=2500 to X= -11000, Y=2500. S1 has dropped to 5e-10 mbar.

Note Gleb mentioned that last night it was likely a large proportion of the ions stored were molecular hydrogen not deuterium.

16:18

Temps and system checks OK

Leakage current OK

Merger and tape server OK

18:10

Temps and system checks OK

Leakage current OK

Merger and tape server OK

19:38

Operators are trying to optimize some beam. For now the beam is lower than it should be probably because is easy to work with the source like that.

Temps and system checks OK

Leakage current OK

Merger and tape server OK

14:30

Run 11 started. D+ beam in the ring at 1.5 MeV.

No target at the moment. Valves to the interaction chamber will soon be opened.

Stats and histograms zero'd, monitoring code reset.

All checks and temps OK

Leakage currents OK

ADC data items statistics - attachment 1

Beam in ring ~30s and manipulation ~2s

Beam intensity ~ 5.7E7

16:40

System check OK

Temperature OK

Statistics same as before

Merger and server OK

Leakage currents OK

Beam in the ring

Waiting for target , Hydrogen green

18:50

System OK

Temperature OK

Statistics same as before

Merger and server OK

Leakage currents OK

Beam ~4x10^7

Target tuning ongoing

22:05

System OK

Temperature OK

Statistics same as before

Merger and server OK

Leakage currents OK

Currently no beam -> asked operator to check source

Target tuning ongoing

23:22

System OK

Temperature OK

Statistics same as before

Merger and server OK

Leakage currents OK

Currently no beam -> operators are optimizing the intensity of the beam

Optimizing target density as well

00:55

The overlaping test started by moving the beam only in the y axis.

02:00

Overlap test is over and was found that the optimal position for the horizontal axis is 8mm. Beam on target.

Observation of an increase the 1.5 MeV peak in the CARME monitoring code when overlap with the target is found. Attachment 4.

Drop in the beam lifetime is also observed when overlapped with the target.

System OK

Temperature OK

Statistics same as before

Merger and server OK

Leakage currents OK

02:48

CRYRING measurement cycle has been made shorter (from 5 to 3 repetitions) to match it with the decreased beam life time due to optimed overlap with target.

04:37

System OK

Temperature OK

Statistics same as before

Merger and server OK

Leakage currents OK

10:30

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 FEE64 temperatures OK - attachment 1

WR timestamps OK - attachment 2

ADC data item stats - attachment 3

per FEE64 Rate spectra - attachment 4

 why do we observe HEC data in aida15 asic #1?

per FEE64 1.8.L spectra - attachments 5-6

 ADC to 20MeV FSR - not clear when these spwectra were last zero;d

 currently 750keV/u D + no target ?

10.53 All histograms & stats zero'd

Merger, Taper Server etc - attachments 7-8

  bind error 98 for NewMerger server - not clear when these messahes were generated - added some returns to monitor whether these, or other, messages are repeated

DSSSD bias & leakage current OK - attachment 9

11:30

We noticed some odd peak structure in the rate energy histograms for the right hand side detectors. We took away the beam but this structure persisted. 

This was not observed in the total energy histograms, the reason for this is the applied multiplicity cut to the total histograms. Removing this cut the peaks are clearly visible (attachment 10). Putting the cut back in we see the peaks removed (attachment 11). These events correspond to some noisy strips on the detectors on the right hand side (see attachment 12). Notice the much larger rate on the RHS. Current ADC data items statistics show FEE modules for the RHS also much larger (attachment 13). We did not observe this with no beam (https://elog.ph.ed.ac.uk/CARME/554) but did with beam last night (https://elog.ph.ed.ac.uk/CARME/558) so there nust be some effect of having beam in the ring increasing the number of events on the RHS. Note the detectors are fully out and the events are localised in these strips. 

Note we have moved the detectorsand removed beam from the ring in this time period to investigate these peaks.

12:50

Run 10 continues. Temps OK. System checks OK. Merger OK, Tape server OK.

Leakage current OK.

Notice the 'beam peak' at 1.5 MeV is larger in the left hand side (attachment 14)

14:26

We have started the new_optimeren.py on pi@gas-stepper to try and align the gas target. Valves to the interaction chamber are closed.

Setting the nozzle X=-13000, Y=1000 we observe an increase in E4 from 4E-10 mbar to 2E-9 mbar. Moving either side we observe a drop in E4. We take this as the gas target being aligned.

Anton will now open the valves to the gas target.

Run 10 stopped.         

09:34 - Moved to Run 9 in preparation of moving detectors. No target yet. Beam in the ring at 750 keV/A.

Temperatures OK (attach)

System wide checks OK except 16 fails clock and ADC calib

Rates OK (attach)

Writing to disk OK (attach)

Resetting the sorting script. Moving detectors.

Moved detectors in. See attached. Stripe / shadow quite clear. Some oddities on the top-right DSSD. May be due to ExEy cuts and multiplicity cuts.

Moved on tun run 9 to acquire some stats without motion.

10:13 Temperatures still OK. Rates OK. Leakage currents stable.

We were cutting the beam.

Increased repetition to x5.

Motors fully out - run 10 started.

The cave is closed and beam is back

The d intensity is about half of the intensity before the break

The gas target is prepared but the valvas cannot be opened. Anton is coming in at around 1 PM to open the gate valves.

Nikos needs to enter the cave to work on the target cooling.

ADC offsets using pulser walkthrough data from data file APR24/R2

ch = channel + ( module * 64 ) + ( range * 2048 )

adc_data( ch ) = INT( RSHIFT( ABS( adc_data( ch ) - 32768 ), 3 ) - offset( ch ) + 0.5 )




per FEE64 ADC spectra - attachments 1-16

Note common x & y-scales - peak height proxy for peak width

aida01 1.8.L (s7) pulser peak width 9 ch FWHM (~50keV FWHM)




ADC offset analysis

/home/td/Calibration/offsets /home/td/CARME/R2 50 2048 20 5

First pass sort variables NAMELIST I/O format ( ADC offsets, FEE64 configuration, LEC & HEC equal energy cuts ) - attachment 17

18:19 Start or run 7: In beam has been optimzed up to now by Zoran and Claude. ~7E7 particles at injection. From now on, only the injection beamline is optimized by Operators.

Detectors IN (left arm pot =18.86 mm, right arm pot = 19.80 mm)

No Target

Beam is in the ring for ~6 seconds and total cycle time between injections is ~8 seconds

Injection beamline is still in process of optimization by operators

21:30

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

23:30

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

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Beam and Electron Coller failure (~00:35); Beam back (~01:08); Cooler back (~01:20)

03:00

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

Beam and Electron Coller failure (~01:35); Beam back (~01:55); Cooler back (~01:55)

04:40

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

06:00

Merger OK, Tape server OK

ADC data item statistics looks as before. OK

FEE temperatures look OK

System checks OK

Leakage current stable

07:00

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

R4 alpha background continues, currently R4_12

Temps OK, system checks unchanged from previous status (OK, aida16 clock and ADC issue)

10:30

R4 stopped and moved to the next run R5.

Lithium 3+ beam is not feasible at sufficient densities so we are switching to D+ at a beam energy of 0.75 MeV/u. A measurement of d+p at this energy would produce 3He at energies of ~900 keV. 

The current threshold (slow comparator) has been 1 MeV (0x64). We lowered the thresholds in all FEE modules to 200 keV (0x14). ADC rates look fine in all FEEs (~tens of Hz) except in aida 15 and aida 16 which was ~several hundred kHz. Data rate to disk was 1.2 Mb/s

We increased the threshold in aida 15 and 16 only to 500 keV (0x32) and rates in aida 15 and 16 have dropped to <20 kHz. Data rate to disk now 220 kB/s.

11:00

R5 stopped. R6 started - background with reduced thresholds. 

Attachment 1 - ADC data items statistics

Attachment 2 - Histogram browser statistics

Attachment 3 - Tape server

Attachment 4 - New Merger

13:12

R6 continues R6_9

Edits to the CARME sort code have been made. EyEx energy cut for online monitoring reduced to 100 keV. Multiplicity cut applies to lowEnergyEy, lowEnergyEx and lowEnergyXY histograms. Multiplicity cut considers only single strip events.

15:00

D+ beam is now in the ring and is being optimised by the beam operators. The CARME detectors are currently fullt out, but we can see some effects of the beam on the online monitoring code.

09:00

R4 alpha background continues, currently R4_12

Temps OK, system checks unchanged from previous status (OK, aida16 clock and ADC issue)

R3 started

Pulser ON. Approx 2 kHZ.

1.8*w waveforms attachments 1+2

ADC data items statistics - attchment 3

1.8*L spectra - attachments 4+5

Pulser widths are larger than during testing prior to the Feb beamtime. Widths in Channels;

aida01 = 76

aida02 = 82

aida03 = will upate all later tonight..

R3 ended. Pulser OFF

17:15

R4 Started. Alpha background run.

13.35 FEE64 temperatures OK - attachment 1

      ADC data item rates OK - attachment 2
       overall rate dominated by 2x hot channels aida15

     per FEE64 Stat spectra - attachment 3
      spectra consistent with April alpha background test 
      note high HEC data stats for aida12 asic#2 - can probably be fixed by ASIC control check

     per 1.8.W spectra - 20us FSR - attachments 4-5
      note 100kHz ripple observed for some FEE64s cf. https://elog.ph.ed.ac.uk/CARME/544

Run stopped 15:15 

27/05/24

The carme-gsi computer has been moved from the server room into the shifter control room.

Startup of the DAQ looks OK. Settings loaded 2024Apr24

System wide checks OK. Aida16 clock status fails. Aida16 ADC calibration fails. Rest OK.

All FEEs look OK, we again see high rates in aida15 ~ 12k data items/sec, rate in other FEEs is 0.

Testing of the pulser widths has been done. Pulser widths will be uploaded soon.

Background run started. No beam, no target. File G22-201 and R2. Data being written is ~128 kb/s. Run will be left overnight, no night shift.

28/05/24

DAQ continues with alpha background run.

System wide checks OK. Aida16 clock status fails. Aida16 ADC calibration fails. Rest OK. Temps OK

Data can be seen in the spectrum browser on MIDAS. CARME monitoring code was started incorrectly yesterday. It has now be restarted and a small number of events are seen