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

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

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.

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.

11:10

We have started a new run at the same energy as R53 (250 keV/u) due to an issue with the DAQ pc

Server and DAQ restarted

ASIC settings loaded 2025APR08. Only changes made are setting all FEEs to LEC (0x0) on channel 10, and setting the slow comparator thresholds to 0x14 (200 keV).

All beam settings are the same as the previous elog. Detectors remain stationary and in the fully out position.

All checks ok!

ADC data items statistics appear unchanged. See attachment.

Data rate ~ 800 kB/sec

12:40

All checks ok

The target is not super stable.

14:00

 Checks ok!  Target back to >3E12 1/cm2

15:00

 Checks ok! 

17:00

Full check, everything looks okay!, Areal density is in beetween 3-5E12. Rate in all the detectors look fine.

19:14

Full check, everything looks great. Average arial density around 5e12 atoms/cm2. For more details please look at the attached screenshots

20:20

Target density dropped to 8e10, We are waiting for 20 minutes before changing the nozzle positions!

20:41 : slowly increased to 2.2e11 but it is not increasing anymore

20:43 Changed the nozzle position X fromm -1000 to -1500

20:56, Target thickness recovered bsck to 5e12

21:25, Full check, everything runnig smoothly. There is nothing unexpected, for details, please have a look at the attached file

22:30 Full check, Stable target thickness of more than 5e12 atoms/cm2. everthig running fine:-) For more details, please look at the attached screenshots!

00:52

Temperatures OK

Rates OK

Leakage current stable

System wide checks OK

Merger OK

Beam is on

Target looks fine, 2E-10 mbar in YR09 Etarget

02:51

Temperatures OK

Rates OK

Leakage current stable

System wide checks OK

Merger OK

Beam is on

Target looks fine, 3E-10 mbar in YR09 Etarget

03:45

Temperatures OK

Rates OK

Leakage current stable

System wide checks OK

Merger OK

Beam is on

Target looks fine, 4E-10 mbar in YR09 Etarget

07:05

Temperatures OK

Rates OK

Leakage current stable

System wide checks OK

Merger OK

Beam is on

Target looks great!!! 1.1E13 this morning!!

08:05

All checks ok!

09:05

All checks ok! Target is perfect to make this Sunday amazing

10:00

All checks ok! We completed the data taking on this energy. Atatched the final stats.

Run 53 started at 18:25 (started already earlier but since then data is taken). Everything is running again. We started at 3E12 at/cm2.
Side comment: Gleb told us 1h ago that he will switch to coasted mode and call us back as soon as he is done. So far he didn't call back and he is not in the office... So we decided to start data taking already. But: the software says that coasting mode is already on, but the graph looks like bunched mode... So we started data taking and will update this situation as soon as Gleb called us. -> Update: Okay, we were the entire time in coasting mode

D+ beam deuterium target. D+ beam energy is now 0.25 MeV/u. (beam calc calculation is 0.2570 MeV/u).

All four detectors positioned fully out and stationary.

Left potentiometer = -2.76mm (corresponds to x = -2500, which is the more trustworthy value)

Right potentiometer = 1.77 mm (corresponds to y = 2500, which is the more trustworthy value)

Ring cycle time is 5 seconds.

Cooler set value = 146.25 V, 2 mA. Read value = 146.2 V, 0.00179 mA

All leakage currents look good.

Beam position. Vertical =0.0mm , Horizontal=-2.0 mm

Data rate ~ 812kB/s

After starting the run we struggled because we did not know whether we can trust the beam overlap test after going from bunched mode to coasting mode. We therefore stopped data taking for approx. 1h to to this test once again in coasting mode, but did it via the Rutherford measurement. The result showed that the optimum is exactly the same: x=-2mm (see attachment 1).

However, we are strugglign with the areal density... It quickly dropped to 2E10 and slowly recovered in a more or less oscillating way (see attachment 2; the first four columns are the integrals of the four detectors, the next column is the sum of them. Afterwards its the average areal density and the last column is the total integral divided by the average areal density).
 

19:29: Storage turned back on
Left potentiometer now = -2.79mm (corresponds to x = -5000, which is the more trustworthy value)

19:53: Areal density dropped to 2E11, so we moved the left potentiometer once from x=-5000 to x=-4500. Sudden increase in pressure, but slow decrease again.
19:59: Left potentiometer once from x=-4500 to x=-4000. Seems to be the right direction... But we do it slowly...

20:19: Full check. Everything is okay, but areal density is still... aweful... Most of the time its between 1E11 and 1E12 at/cm2
20:20: Left potentiometer once from x=-4000 to x=-3500. Seems again to be the right direction... Sudden increase from 7E11 to 2E12
20:40: Everything stabilized at a higher average areal density. We are now fluctuating between 1E12 to 5E12.

20:55: Left potentiometer once from x=-3500 to x=-3000. Seems again to be the right direction... Sudden increase from 9E11 to 3E12

21:56: Full check. Everything is okay and areal density finally stabilized. Its now since 1h between 3E12 and 5E12.
22:47: Full check. Everything is meraviglioso!

23:20 

Checks OK

Target density remains stable around 5e12 at/cm2. Count rate has improved to around 200 c/h for 3He, 150 c/h for 3H and 80 c/h for 1H.

02:20

All checks OK

Count rates look pretty good, target density has maintained mid-high e12 lavel over last 3 hours.

peaks in spectra very clear

05:00

Checks OK

Now have several thousand counts total. Target level in high e12 level.

07.06.2025

07:00

Full checks! Target level 1-6E12 [1/cm2]

10:00

The x server on the CARME-gsi computer appears to be struggling and is not able to be checked. Needs a reboot. 

We still have ssh access and are able to access the DAQ on another CRYRING machine machine via 192.168.207.143:8015. DAQ is still running. We will try to reboot the x server without disturbing the DAQ. 

oopsie whole carme-gsi rebooted not just the x server. Restarting DAQ

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

Run 52 started at 17:53. Everything is running again. We started at 3E12 at/cm2

D+ beam deuterium target. D+ beam energy is now 0.3 MeV/u. (beam calc calculation is 0.3067 MeV/u).

All four detectors positioned fully out and stationary and also detector #4 is running again.

Left potentiometer = -3.03mm (corresponds to x = 0, which is the more trustworthy value)

Right potentiometer = 1.82 mm (corresponds to y = -1000, which is the more trustworthy value)

Ring cycle time is 5 seconds.

Cooler set value = 177.9 V, 4 mA. Read value = 177.65 V, 3.53 mA

All leakage currents look good.

Beam position. Vertical =0.0mm , Horizontal=1.0 mm

Data rate ~ 947kB/s

18:09: System check - everything perfect!

Leakage current attachment 1

Rates attachment 2

19:50: System check - everything marvelous!

22:05: System check - everything excellent!

22:50: System check - everything fabulous!

current spectra attachment 3

02:05

Temperatures OK

System wide checks OK

Statistics OK

Merger OK

Leakage current OK

Ring vacuum OK

04:52

Temps OK

System wide checks OK

Stats OK - attached

Merger OK - attached

Leakage OK - attached

Histos look good - attached

07:10

Temps OK

System wide checks OK

Stats OK - attached

Merger OK - attached

Leakage OK - attached

Histos look good - attached

11:31

All checks OK

13:54

All checks OK

Rates attached

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.

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

11:30

Run 50 started.

D+ beam deuterium target. D+ beam energy is 0.35 MeV/u. (beam calc calculation is 0.3577 MeV/u)

Target density is about 4e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 10 seconds.

Target T1=30.1K, T2=31.8K.

Nozzle position unchanged since end of run 48

YR09-Etarget pressure = 2.05e-10 mbar.

Cooler  Read value = 207.1 V, 4.39 mA

All leakage currents look good (except dssd4, currently stable at V=60)

Beam position. Vertical =0.0mm , Horizontal=0.5 mm

Data rate ~ 172kB/s

Slow comparator threshold to 0x14 (200 keV) since we decreased beam energy.

13:00

All checks OK

We were seeing some rubbish obscuring the 3He peak. JM remembered setting the EYEX cut very high (3 MeV) on the online plot, Now it is reduced to 500 keV

See attachments of histograms before restarting code.
 

16:32 all checks okay
18:19 all checks okay
20:20 all checks okay
21:45 all checks okay

01:00 all checks okay

04:00 all checks okay

7:00

Run stopped - cave to be opened. Beam looks on when run was stopped.

Temps OK - attach

Leakage current stable - attach

Rates OK - attach

Merger OK - attach

Final spectra attached

09:30

Gas target shutter valve closed to save ring vacuum.

All checks OK

Stats at htis threshold with no beam attached.

Biased DSSD4 in steps of 5V from 60V since it has been stable since yesterday,

Was able to bias to 100V with no issues.

01:10

Gas target turned off via the shutter valve.

Run 49 started beam only background run.

Slow comparator threshold lowered to 0x14 (200 keV) in preparation for the energy change tomorrow morning.

Other than that no changes to the DAQ or to the experimental setup.

D+ beam remains at 0.5 MeV nominally. All four detectors positioned fully out and stationary,

I tried to re-bias detector #4 however was not able to bias past 70V. DSSD4 remains off and set to the MEC (0x1). (see attchement 1)

Ring cycle is every 10 seconds. Beam position unchanged, Beam position. Vertical =0.0mm , Horizontal=0.0 mm

Ring vacuum is now 3.16e-11 mbar. Before switching off the gas target density was 2e12 at/cm2

Data rate is 89 kB/sec

ADC data items stats remain largely unchanged at new threshold. (see attachment 2)

Aida01 has increased to several thousand. Tried check ASIC control on asic #4 of aida01->no effect on higher rates.

01:20

All checks OK.

After 20 minutes of running see energy histogram and xy histogram (attachments 3,4)

Interesting xy pattern (hydrogen? Injection noise?)

Note put aida13-aida16 slow comparator threshold back to 0x24 as we had some rates coming through (~1kHz) which is now back to zero. If we revive the detector in the morning, the thresholds should be lowered in line with other detectors.

03:00

All checks OK

04:30

All checks ok

7:20

All checks ok

Run stopped, final energy histogram and xy histogram attached.

Doing morning check. Checked the leakage currents, all ok. Attachment 1

Temperatures ok, attchment 2

System wide check, all correct.

Statistics ok (as far as we can tell) attachment 3

Spectrum browser ok, attachment 4

Checked merger, spinner spinning...

Attachment 5 shows the BPM scope (i.e. induced signals from the ion buchnes) for the duration of injection, bunching, acceleration, debunching.

Beam current is around 2.5E7 and the target dencity is 6.3E11 cm2.

Run 48 started

Run 48 started. Everything is running again. We started at 3E13 at/cm2

D+ beam deuterium target. D+ beam energy is still 0.5 MeV/u. (beam calc calculation is 0.5143 MeV/u). See previous entry for beamcalc.

All four detectors positioned fully out and stationary, however we switched off detector #4.

Left potentiometer = -3.03mm (corresponds to x = 0, which is the more trustworthy value)

Right potentiometer = 1.74 mm (corresponds to y = -500, which is the more trustworthy value)

Ring cycle time is 10 seconds.

Cooler set value = 297.2 V, 8 mA. Read value = 296.7 V, 7 mA

All leakage currents look good (except dssd4, currently turned off)

Beam position. Vertical =0.0mm , Horizontal=0.0 mm

Data rate ~ 108kB/s

16:40  Change Gasjet target Y=-500 to Y=0
17:37  Change Gasjet target Y= 0 to Y= 500

20:30 We now take some time to optimize the areal density
20:30  Change Gasjet target Y= 500 to Y= 1000 (resulting in 2E12)
20:32  Change Gasjet target Y= 1000 to Y= 500 (resulting in 4E12)
20:33  Change Gasjet target Y= 500 to Y= 0 (resulting in 7E12)
20:35  Change Gasjet target Y= 0 to Y= -500 (resulting in 1.1E13)
20:37  Change Gasjet target Y= -500 to Y= -1000 (resulting in 1.8E13, still increasing and amazing for almost 1h)

21:48: Since approximately 20min its just going down systematically from a stable 2E13 to 6E12...) Lets try another round of optimization...
21:48  Change Gasjet target Y= -1000 to Y= -1500 (starting at 7E12 and resulting in 2E12)
21:49  Change Gasjet target Y= -1500 to Y= -1000 (starting at 2E12 and resulting in 6E12)
21:50  Change Gasjet target Y= -1000 to Y= -500 (starting at 6E12 and resulting in 9E12)
21:51  Change Gasjet target Y= -500 to Y= 0 (starting at 9E12 and resulting in 1.3E13 but dropping back to 7E12 within 3min)

21:54  Change Gasjet target. Leaving Y at 0, but moving X from 0 to -500 (starting at 6E12 and resulting in 3E12)
21:55  Change Gasjet target. Leaving Y at 0, but moving X from -500 to 0 (starting at 3E12 and resulting in 4E12)
21:56  Change Gasjet target. Leaving Y at 0, but moving X from 0 to +500 (starting at 4E12 and resulting in 6E12)

21:59  Change Gasjet target. Leaving X at 500, but moving Y from 0 to +500 (starting at 5E12 and resulting in 7E11...)
22:00  Change Gasjet target. Leaving X at 500, but moving Y from +500 to 0 (starting at 7E11 and resulting in 2E12)

Side comment: It seems no matter what we do, that there is a general decrease within the last 30min...

22:00  Change Gasjet target. Leaving X at 500, but moving Y from +500 to 0 (starting at 7E11 and resulting in 2E12)

Okay... No matter what we do... Its still decreasing...

22:03  Change Gasjet target. Leaving Y at 0, but moving X from 500  to 0 (starting at 1E12 and resulting in 2E12)
22:06  Change Gasjet target. Leaving X at 0, but moving Y = 0 from  to -500 (starting at 2E12 and resulting in 5E12
22:09  Change Gasjet target. Leaving X at 0, but moving Y = -500 from  to -1000 (starting at 5E12 and just randomly fluctuating within the next 15min... and more decreasing than increasing...)

22:25  Change Gasjet target. Leaving X at 0, but moving Y = -1000 from  to -1500 (starting at 1E12 and resulting in 2E12... )
22:31  Change Gasjet target. Leaving X at 0, but moving Y = -1500 from  to -2000 (starting at 1E12 and resulting in 8E11... ) Whaaaat????
22:32  Change Gasjet target. Leaving X at 0, but moving Y = -2000 from  to -1000 (starting at 9E11 and resulting in 4E12... ) Okaaaay lets wait and see...

01:00

Run stopped.

Final statistics very high. Over 10,000 counts for 3He and 3H, Over 5000 counts for proton.

Final energy histogram and xy plot on final attachments

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 47 started. Target cooling down after water cooler failure, beam only background

D+ beam deuterium target. D+ beam energy is 0.5 MeV/u. (beam calc calculation is 0.5143 MeV/u). See previous entry for beamcalc.

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 10 seconds.

Cooler set value = 297.2 V, 8 mA. Read value = 296.477 V, 6.97 mA

All leakage currents look good (except dssd4, currently stable at V=40)

Beam position. Vertical =0.0mm , Horizontal=0.0 mm

Data rate ~ 25kB/s

13:00

Run stopped to allow tuning of parameters for 0.35 MeV/u

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

Run 45 started.

D+ beam deuterium target. D+ beam energy is 0.5 MeV/u. (beam calc calculation is 0.5143 MeV/u). See attachment for beamCalc

Target density is about 2e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 10 seconds. (optimized with calculation https://web-docs.gsi.de/~stoe_exp/web_programs/optimizer/index.php)

Target T1=29.9K, T2=31.6K.

Nozzle position was not touched since run 40 (not clear how to double check)

YR09-Etarget pressure = 1.33e-10 mbar.

Cooler set value = 297.2 V, 8 mA. Read value = 296.477 V, 6.97 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=0.0 mm

Beam intensity ~6e8 on bunched beam, unknown on coasting.

Data rate ~ 422kB/s

Attachements:

- beam cycle time optimzer results (https://web-docs.gsi.de/~stoe_exp/web_programs/optimizer/index.php)

- full paramodi export

- leackage current plot

- beam target overlap measurement

22:55 - all checks okay

23:00-00:00 atppc025 crashed, taking down the proxy to the internet and anydesk. Recovered remotely moving proxy to atppc022. Let Michael know, then move back to atppc025 (contact CB or JM). 22 seems to work fine, no rush

Tried to move InteractiveMotion.x screen on carme-gsi since it was on atppc025, which froze. Cannot ssh to carmemotorspi from carme-gsi, except if already ssh in. Must be a proxy issue. Motors are stationary, will fix tomorrow morning.

00:00 Found DSSD 4 unbiased. Strong spike in leakage current just before midnight. Correlated with atppc025 freezing? Maybe a power fluctuation? No storage. Attempting to re-bias. Beam and target appear to be fine. Merger appears to be fine.

Moved right arm slightly with servo. No effect on bias.

V = 50 -> 14 uA oscillating

V = 40 -> 7 uA oscillating

V = 30 -> 4uA stable

V = 35 -> 6.5 uA unstable

Cannot bias above 35 V. Will leave DSSD4 condition overnight. LEC-> MEC on DSSD 4.

Run 45 final histograms save. Started new run with same conditions except DSSD 4.

04:00

Temps OK

Rates OK (no dssd 4)

Merger OK (38 kb/s)

Histo attached

Could increase bias in 4 to around 70 V before the current got unstable. Ramped down to 30 V again. Need to try significantly slower, 10 V an hour or so -> morning shift.

07:10

Since 4:35 no electron cooler

7:15 electron cooler back

Temps OK

Rates OK (except dssd4)

Merger OK (38kB/s)

Histo attached

8:35

V=40  -> 8uA oscillating 

V=50 -> 8uA oscillating

V=40 -> 7uA oscillating 

V=30 -> 3.9uA oscillating 

Performed a V-I curve test of dssd 4

Turned bias OFF, went to 5V and then bias ON again 

V=5 -> 1.245uA stable 

V=10 -> 1.820uA stable 

V=15 -> 2.300uA stable 

V=20 -> 2.720uA stable 

V=25 -> 3.105uA stable 

V=30 -> 3.460uA stable 

V=35 -> 3.795uA stable 

V=40 -> 4.115uA stable 

V=45 -> 4.425uA stable

V=50 -> unstable 

Turned bias OFF again, then back on after few minutes

V=5 -> 1.240uA stable 

V=10 -> 1.820uA stable 

V=15 -> 2.295uA stable 

V=20 -> 2.715uA stable 

V=25 -> 3.100uA stable 

V=30 -> 3.450uA stable 

V=35 -> 3.790uA stable 

V=40 -> 4.110uA stable 

Leaving at 40 for a couple of hours 

10:55

Tried 0x1 for medium/low energy selection for aida 13,14,15,16 but rate was roughly 250000 across all 

11:30

Water coolers have gone down, moinitoring the FEE temperatures, stopped the run 

11:48

Water cooling back

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.

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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: