06:20

Servo motors moved to fully out position as some work on the beam was neccessary. Beam injection had dropped from ~9e7 to around 1e7. Potentiometer reads 19.10 mm.   

Still trying to improve target density. Current setpoint 100 K.

Merger OK

Data rate = 1600 kb/sec

Leakage current = 3.21 uA

System checks OK - wr fails

         Base         Current     Difference
aida01 fault      0xab60 :      0xab8e :      46  
aida02 fault      0x88d3 :      0x8900 :      45  
aida03 fault      0x23aa :      0x23d8 :      46  
aida04 fault      0x15d7 :      0x1605 :      46  
aida05 fault      0x2f03 :      0x2f0f :      12  
White Rabbit error counter test result: Passed 0, Failed 5

Understand the status reports as follows:-
Status bit 3 : White Rabbit decoder detected an error in the received data
Status bit 2 : Firmware registered WR error, no reload of Timestamp
Status bit 0 : White Rabbit decoder reports uncertain of Timestamp information from WR

Avg ring pressure = 4.3E-10 mbar.

06:40

Target density still very low. Setpoint back to 116 K. Detectors still fully out, very low rutherford rate.

Attempted to move nozzle to increase density, already on maximum point. 

06:50

Setpoint to 95 k. Small increase in target density, however this was temporary

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.

09:49

DSSD4 has been biased to 100V in steps of 5V from 60V. It was previously stable overnight at 60V - attachment 1

Will keep an eye on it but looks OK at the moment. Current bias and leakage current - attachment 2

I have reset DSSD4 FEES (13,14,15,16) to the LEC and lowered the thresholds to be in line with other FEES.

Current slow comparator threshold for all FEES is 0x14 (200 keV).

Attachment 3 shows current ADC data items statistics.

Started a new run 51 with no beam and no target. Access to the cave is allowed.

Current data rate is 800 kB/sec.

All statistics and histograms in aida zero'd

12:57

Temps OK

Rates OK - attached

Merger OK

System wide checks

14:58

Temps - OK

Rates - OK

Merger - OK

15:00

Beam tuning to start soon. No storage.

15:00

Cave closed, waiting for beam to come back.

Reset all ASIC settings to those in elog 737

DSSD4 remains OFF and is set to the MEC channel.

ADC data items and data writing to disk - Attachments 1+2

While the cave has been closed we warmed the target up to 80K and have now cooled back to 30.5K to increase the density which was dropping into the 10^11 range. We have now recovered densities in the mid 10^12 at/cm2 range.

Detector leakage current plot - Attachment 3,4

All system checks OK

Started at 16:20

EM and JG trying to get scintillator signals in MBS

Configuration completed?

Stopped 16:32

13:37 Run started - no beam in the ring (One of the ring magnets was still on RED when it should have been set to green by HKR)

14:28 Beam ON - still observe beam halo on DSSD0 (Top left)

          YR09 Vertical and horizontal offsets set to -9.0 mm

14:36 Target ON, Beam ON

         We can see the beam halo on the detectors again in the same position as previous tests. The energy histograms for the detectors show only low energy events, except bottom left detector where we see a peak around 20 MeV. With the target on we see additional events but we only see events at ~20MeV for the    bottom detector still in the bottom left detector. We are moving the detectors IN to try and see events from scattering of the beam on the target. We may not be hitting the target with the beam.

15.29  We observe data in DSSD # 0, 2, 3 (top left, bottom left, bottom right) which is consistent with a line beam halo on the detector. The top right detector is positioned higher by ~10 mm than the top left detector so it is not unphysical to not see any events in this detector from the halo.

           The energy of events in each detector is not consistent however. In DSSD #0 and 3 we see mainly low energy events (some small number of 20 MeV events is seen) but in DSSD #2 we see mainly higher energy (20 MeV) events. See attached energy histograms, xy and Ex vs x plots (attachments 1-3).

          This is consistent with the data from channels seen in MIDAS for aida04 (DSSD #0) and aida12 (DSSD#2).

          Switched FEE64 range bit frpom 20MeV FSR to 1GeV FSR to see if any events are over the 20 MeV range of the low energy channel . Slow comparator from 0x64 to 0x5. We see no events just above 20 MeV  in aida04 but do in aida12. See attachments 4 & 5

          No data ( > 20MeV nominal ) out of range in DSSSD #1

         FEE range set back to FSR to 20 MeV and slow comparator set back to 0x64

15:57  Beam on target. Left arm fully out (pot 18.8 mm), right arm fully in (pot 83.69 mm). Beam injection ~1e6, target density 2e11. Cycle time between 4-13 s.

        Leaving for more stats

17.30 Routine system checks

         DAQ continues file G22-88/R16_14

        DSSSD bias and leakage current OK - attachments 8 & 28

         DSSSD #2 bias -100V, all other DSSSDs -150V

         ambient temperature +17.0 deg C

      FEE64 temperatures OK - attachment 9

      All system wide checks OK

      WR timestamp OK - attachment 10

      aida01 & aida03 ASIC settings - attachments 11-12

      AIDA ADC, PAUSE, DISC, correlation - attachments 13-16

        ADC data item rates OK

     per FEE64 Rate spectra - attachments 17-18

      note change in rates for aida12 & aida13 - presumably due to beam cycle?

    per FEE64 1.8.L, 1.8.H and 1.8.W 20us FSR spectra - attachments 19-24

    Merger, Merger stats and TapeServer - attachments 25-27

18.10 ML CRYRING vacuum - attachment 29

FEE spectrum browser statistics attachment 30 - not many missing channels - aida04 asic 2 perhaps?

18:40 End of run. Target x position moved out by 3000. Faraday cup to the ring closed. Detectors moved fully OUT.

Run 17 started - alpha background

21/2/22 16:00

Call from main control room, beam is ON, probably has been for several hours judging by rate on xy total plot.

Changes made to online monitoring code by OH, include setting to only 1 DSSD, correct offsets from the pulser walkthrough, offline analysis capabilities and X/Y position correction. 

Monitoring code restarted in CARME_SORT/build_no_output

17:31 Run 50 ended, run 51 started now beam is definitely in the ring. Tried to insert span zero schottky into aida2 correlation scalar, however rate was far too high.

18:03 Removed span zero schottky signal, started new run 52.

With beam ON we noticed some missing channels in the xy total plot. Aida 1 and 2 stat totals on spectrum browser show missing channels. Asic check on both to no effect. Fees power cycled.

19:57 Started run 53. Currently waiting for beam

21:20 Beam ON

1*L plots checked for aida 1, several channels showed no data (noise)

Slow comparator LEC threshold lowered to 0x32  to aida 1, checked 1*L plots and channels are now showing lots of noise. So those channels appear to be quiet using 0x64 threshold. (attachment 3)

Threshold increased back to 0x64

22:33

System checks OK -white rabbit fails on all. ~30 seperation

Temperatures OK

Statistics within range - new scalars added for aida02 and aida05

Data being written ~300 kb/sec

Leakage current ~3.6 uA

00:39

System checks checks OK -white rabbit fails on all. ~42 seperation

Temperatures OK

Statistics within range with new scalars

Data being written 256 kb/sec

Leakage current ~3.615 uA

XY counts dominated by hot channels - most blue pixels are ~10 counts

Edinburgh group ion gauge turned OFF -> decrease in leakage current from 10.05 uA to 6.5 uA

GSI vacuum group ion gauge turned OFF -> decrease in leakage current from 6.5 uA to 3.63 uA

GSI large ion pump turned ON -> no effect on leakage current

Motors moved IN the same as elog 201. No significant increase in leakage current as moved further into the chamber (attachment 1). Pulser widths follow similar path as previous tests. Aida1 and 2 statrt with larger pulser widths which reduce as are moved into the chamber. Aida3,4 start lower than aida1,2 and remain at same level throughout. (attachment2)

RF ring signal removed from aida5. Data rate dropped back to ~20 kb/sec, Merger rate ~80,000 items/sec

Noise peak on aida1 appears reduced after gauges switched OFF with detector fully out (attachment 3) coompare to elog 201

Noise peak is removed once detector is moved in. (attachment 4)

Ey histogram (attachment 5) shows multiple peaks for the same pulser amplitude. 

XY total pixels plot (attachment 6)

1.8 waveforms for aida 1,2,5 (attachment 7)

Both GSI vacuum group and edinburgh ion gauges OFF

Fees power cycled. All system checks OK.

Writing to file, alpha background overnight.

Moved detector IN 2mm. Noise appears reduced with any distance moved in so overnight spectra to be taken while IN. Not moving further in as possible beam tomorrow.

22:44

Leakage current stable, slowly decreasing ~3.57 uA (attachment 1)

Statistics look OK

Temperatures OK

System wide check all pass - OK

Noise appears much reduced on spectrum Browser channels. (attachement 2). Compared to same plot on elog 197

XYtotal per pixel (attachment 3)

Ex histogram (attachment 4)

16:00

Check Fee temperatures: all green (see attachment 1)

Check statistics tab: ADC data items (see attachment 2)

                                 Good events (see attachment 3)

                                  ADC coincidence-info #8 (see attachment 4)

Check NewMerger tab: (see attachment 5)

Check Leakage current: (see attachment 6)

Check the following plots: LowEnergyExTotal (see attachment 7)

                                         LowEnergyEyTotal (see attachment 8)

                                         LowEnergyXYTotalDSSD0 (empty.)

Check Spectrum Browser tab: (see attachment 9)

Check system wide checks tab: all okay.

All is good.

17:00

Pulser walkthrough completed on run R38

290

280

270

250

240

230

220

210

210 / 10

230 / 10 (can't see)

210 / 5 (can't see)

190

90

150

130

70

50

10 (can't see)

30

15 (can't see)

Pulser to 70

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

Run55 - detector out, start 22/2/22 13:20, end 23/2/22 10:49

Run 56 - detector moved in, start 23/2/22 10:4, end 23/2/22 15:46

Run 59 - detector position optimised, detector position in, start 23/2/22 17:57, end 24/2/22 00:04

23:40

Offline anlaysis shows two clear peaks for DSSD1 and 2 at very low energies close to the threshold. One must be elastics and the other a noise peak.

For DSSD3 the noise level is so exceptionally high due to the low threshold that nothing can be discerned from background.

Therefore I decided to stop the previous run and increase the slow comparator threshold for DSSD3 from 50 keV to 80 keV (same as DSSD2).

Run 65 started.

150 keV/u beam on target, Target overlap confirmed with lifetime measurement using bunched beam.

Detectors in with servos only. Both arms are IN and stationary.

Left potentiometer = 36.54 mm

Right potentiometer = 37.96 mm

Data rate has dropped to 1.5 MB/sec and merger is between 600k and 900k.

Stats attached at new thresholds.

Stats zero'd to see number of pause and resume overnight.

02:30

Some reaction counts visible on monitoring histograms (rate v low)

Checks OK, same fee (aida16 fails clock and adc as before)

pause info items after a few hours attached

05:00

We see the peaks much more clearly now. Rate is low but they are there. Target density looks like it has been fluctuating in the low 10^12 region. 

Note for this energy with 1e8 pps, 1e12 target density I estimate ~2 counts/h per detector for the 3He peak.from our spreadsheet calculator. After 6 hours of this run I saw about 10-15 counts in the peak of DSSD2, perhaps the same in DSSD3. DSSD1 has missing strips so is harder to see. This rate is about 48 hours for 5% (if we had 4 dssds).   

Checks OK

Leakage current of dssd4 has been stable at 40V for a while now. Pushed voltage up to 75V with leakage current stable. At 80V it started to go over current

Turned bias to 60V and have left on at this level. It looks stable. Perhaps in the morning it can be pushed to close to 100V.

07:15

Temps OK

System wide checks: 16 fails ADC calibration, 14 fails WR decoder

Rates OK, some Pause/resume statementes overnight. See attached x2

Merger OK. 1.5 Mb/s

Peaks clearly visible in two detectors.

08:25 All checks OK. DSSD 4 to 75V - OK.

09:10 All checks OK. DSSD 4 to 80V. Trying to improve target (2-4E12).

Run 27 Started to check optimsation of the beam - target overlap.

Beam intensity at injection is roughly 1e7 particles

Target density apporx 4.2e11 atoms/cm2 and stable.

Ring pressure is below 1e-10 mbar for all ring sections and stable

First optimisation procedure was to vary the horizontal beam position and see the effect on the count rate in detector #0 (top left) (see elog 509). Beam position was scanned from -9 and -4. Attachment 1 shows the maximum in count rate around the -7.5 position. 

Second optimisation procedure was to change the time ions are allowed to circulate in the ring before being dumped. The count rate over 5 minutes in detector #0 (top left) at ~20 MeV was used as a gauge. This is the only part of the cycle we can control.

Time (s)    Counts

2               148

3               200

4               178

21:00

Run 35 started.

D+ beam deuterium target. D+ beam energy is 2 MeV/u. (beam calc calculation is 1.9211 MeV/u -> may be wrong cooler voltage, need to check grafana)

Target density is about 4e12 at/cm2. FLuctuations between 1e12 and 1e13 at/cm2.

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 1 minute. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30K, T2=31.9K.

Nozzle position x=-3.06, z=1.72 mm

YR09-Etarget pressure = 2.29e-10 mbar.

Cooler set value = 1126V, 15 mA. Read value = 1068V, 13.22 mA

Detector 4 is still a bit unstable in its leakage current but the data coming through looks good. Some crap is periodically written to disk when leakage current spikes. Attachment 1,2 for leakage currents.

Attachment 3,4 data rate to disk and statistics tab for when detector 4 is behaving. When not data rate can spike to 4000 kb/sec. Looks OK at the moment.

Attachment 5 - xy plot. We observe a circular shape on the detector. We are unsure of what this is at the moment. Offline analysis required.

Attachment 6 - energy histogram including Rutherford.

Attachment 7 - energy histogram just nuclear peaks.

Attachment 8 - beam calc with read values. 

21:47

Run 36 started.

D+ beam deuterium target. D+ beam energy is 2 MeV/u.

Target density is about 1.6e12 at/cm2. FLuctuations between 1e12 and 1e13 at/cm2.

Detectors are now IN with the servo motors only. Detectors are stationary.

Left potentiometer = 36.54 mm

Right potentiometer = 37.96 mm

Ring cycle time is 1 minute. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30K, T2=31.9K.

Nozzle position x=-3.12, z=1.72 mm

YR09-Etarget pressure = 2.29e-10 mbar.

Cooler set value = 1126V, 15 mA. Read value = 1068V, 13.22 mA

Detector 4 is still a bit unstable in its leakage current but the data coming through looks good. Some crap is periodically written to disk when leakage current spikes.

We will run like this for an hour then move detectors back out for overnight run.

after 1 hour of beamtime we stop.

Attachment 1 - xy plot

Attachment 2 - energy histogram NUCLEAR

01:30

Beam ON ~6E6 pps

Target ON and open to the ring

Target E4 inlet pressure 8.12E-9 mbar

Dump S3 ~ 7E-10 mbar

Nozzle temperature 150 K

1:40

Run 54 started, monitoring code restarted.

03:00

Beam ON ~7E6 pps

Target ON and open to the ring

Target E4 inlet pressure 8.5E-9 mbar

Dump S3 ~ 7.3E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

04:00

Beam ON ~5.5E6 pps, but it fluctates between 2e6 and 6e6 (like a step function) in about each 5-10min

Target ON and open to the ring

YR09xxx ETarget ~1.8e-10

Target E4 inlet pressure 8.4E-9 mbar

Dump S3 ~ 7.0E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

05:00

Beam ON ~2E6 pps, still fluctates between 2e6 and 6e6 (like a step function)

Target ON and open to the ring

YR09xxx ETarget ~1.8e-10

Target E4 inlet pressure 8.3E-9 mbar

Dump S3 ~ 6.8E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.

06:00

Beam ON ~1.5E6 pps, still fluctates between 1e6 and 6e6 (like a step function)

Target ON and open to the ring

YR09xxx ETarget ~1.8e-10

Target E4 inlet pressure 8.2E-9 mbar

Dump S3 ~ 6.5E-10 mbar

Nozzle temperature 150 K

Run 54 started, monitoring code restarted.