12:52

Started Run 58 - Beam energy 200 keV/u.

Slow comparator threshold set to 0xc (130 keV) for all channels. Fast discriminators turned OFF for all channels by setting enable mask in discrinator control to 0xfffff. See attachments. 

D+ beam deuterium target. D+ beam energy is now 0.2 MeV/u. (beam calc calculation is 0.2037 MeV/u).

All four detectors positioned fully out and stationary.

Ring cycle time is 5 seconds.

Cooler read value = 117.58 V, 0.00178 mA

Target around 8.9E12 atoms/cm2

All checks ok!

Beam on ionisation profile monitor is lost quite rapidly and looks to increase in size quite a lot due to target interactions. We may have to look at lowering target density

Attachment 25 shows IPM with no target and attachment 26 shows IPM with the target 8e12 at/cm2. Compare also to attachment 12 (IPM with target at 2.6e12).  

14:20

Checks are ok!

15:25

Fees 13-16 switched to MEC and bias on DSSD4 switched off

All other checks ok

17:00

Target dropped to 1-2E12 atoms/cm2

All checks okay- 17:25

17:45

Moved nozzle from x=-1500 to x=-2000, density went from 1E12 to 3E12

Moved nozzle again at 18:00 from x=-2000 to x=-3000 in steps of 500, density at 4E12

18:45

Turned bias ON for dssd4 stable at V=10 but unstable at V=20 so bias turned back OFF

19:30

All checks ok!

IPM attached, target density 2.6 atoms/cm2 (attachment 12)

20:00

Tried moving the nozzle more as target density dropped to 2-3E12 again

Moved in 500 steps either side of x=-2500 but didn't improve, then moved in 100 steps from y=1600 to y=2300 and target density now 6E12 at x=-2500 and y=2300

Tried dssd4 again but only stable to V=20 so bias OFF 

21:50- All checks good, target density stable at 8E12

22:50- All checks fine (see attachments), target density at 6E12

00:10

Checks OK. Have zero'd statistics to see pause and resume statements over an hour.

Rates looks OK. ~140 c/h 3He, and ~80 c/h for 3H and 1H each.

Target has been stable at 7e12 at/cm2 for the last hour. 

02:10

Checks OK. See pause statements after 2 hours - attachment 27, very few overall.

03:07

Checks OK. Target (9-11)E12

04:06

Checks OK. Target (9-11)E12

07:00

Checks OK. Target 9.8E12

page AIDA/Check/Check.tml.  failed

ptoblem fixed

09:00

Checks OK. Target 8.9E12

10:32

No target data displayed for 10 minutes, but jet density unchanged. Restored display from remote access by M.L.

11:22

Storage data stopped and Faraday cup inserted to check the leakage current of Detector #4. Not good, current increases above 10 uA already at 40 V. 

11:29

HV Detector #4 swithced off, Faraday cup removed, data stored again.

11:35

Check OK. Target 8.6E12

13:06

Check OK. Target 7.5E12

15:00

Temperature check - aida03 returns "No response". No response for rates either. Merger looks fine for 3? Likely just happened.

Attempted to STOP the DAQ. All FEEs still going (refused to stop) and 3 in error. Decided to just turn all FEEs off.

Restored DAQ with no issues. 3 is working. Temperatures fine. Rates fine. Unclear what had happened.

Run59 is EMPTY. New run = run 60.

16:00, Full check, everything working after the restart

17:35  Full check, everything is working smoothly!

18:35: Full check, status -Okay.  thickness 5.7E12,

19:35: full ckeck! Status - OKAY, target theckness ~5E12

20:50 : Full check! status - okay

22:00 : Full check, status -okay. Target thickness 6.4E12

22:55 : Full check, status -okay! ------ target thickness 5.8E12

01:00 : Full check, all okay! 

04:00 : Full check, all okay! 

07:00 : Full check, all okay!

10:00

Attempted to change cooling to improve the beam. Changed cooling by 0.5V. Significant improvement in the IPM, but Rutherford goes down. Target missed?

Changed orbit bumps. Increased Rutherford. IPM is back to how it was. Rates are possibly slightly higher? Will attempt more systematically in the afternoon, when we change beam energy again.

Attempted to delay target on by 1 second. No significant changes in beam lifetime or rates. Can try systematically again in the afternoon.

Restored settings to how they were. Started new run 61.

Temps OK

Rates OK

Merger OK

Online histos look OK (did not reset)

Checks

Clock status

FEE64 module aida16 global clocks failed, 6
 Clock status test result: Passed 15, Failed 1

ADC calibration

FEE64 module aida16 failed
Calibration test result: Passed 15, Failed 1

White Rabbit decoder

   
         Base         Current     Difference
aida14 fault      0xbf08 :      0xbf08 :      0  
aida14 : WR status 0x10
 White Rabbit error counter test result: Passed 15, Failed 1

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

FPGA Timestamp error counter test result: Passed 16, Failed 0

11:06

Run during beam change. We will go down to 200 keV/u

All the checks are ok.

No storage mode

Target off

We played with some of the slow comparator thresholds to judge the statistics and data rate. 

Deemed threshold at 100 keV too low for the current beam energy due to excessive rates observed on all FEEs. If required for lower energies we can go to this level. 

Data rate at 130 keV threshold is about 2 MB/sec compared to 8 MB/sec at 100 keV. Note beam energy is 400 keV so no significant benefit going to the lowest threshold. 

NOTE: RunR55 is missing

Run56: Background run with 250 keV/u. Target off using the usual procedure.

All  checks ok!

We moved to nostorage mode and will change the run during the beam change

10:00

The computer screen controlling the DAQ on carme-gsi appeared to have crashed.

Unable to move throught the different windows etc.

Unable to connect via anydesk. ssh access still available. It appears the x-server had crashed, we noticed earlier in the beam certain functions such as screenshots were glitchy so this was probably expected eventually.

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

ssh into carme-gsi and used the command 'systemctl reboot gdml' to attempt to reboot only this server.

This did not have the desired effect, whole of carme-gsi rebooted. We should have turned off the FEEs and stopped the DAQ gracefully but did not.

Restarted carme-gsi and rebooted the FEEs and DAQ system.

All checks OK -> clocks, ADC calibration etc.

ASIC settings loaded are 2025APR08. Only changes made to this settings were reducing the slow comparator threshold from 0x32 (1 MeV) to 0x14 (200 keV). aida03 and aida04 were set to the MEC on these settings, they have now been reset to the LEC channel (0x0). All channels on the LEC.

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

For 200keV the optimal horizontal position is -5mm.
For 250keV the optimal horizontal position is -2mm.

Both values are already given to the operators, so tomorrow we can just switch to 200keV and go on :)

Nonetheless, we now went to 250keV and start measuring.

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.

11:30

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.

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

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 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

Same settings are Run 43 but with coasting beam and scrapers set to:  30 / - 30 mm.

all checks ok, but WR timestamp error, see attached

19:28 the Run 44 has been stopped.

Same settings are Run 42 but bunched beam and scrapers set to:  30 / - 30 mm.

17:00

Scraper tests conducted. We tried moving in the scrapers both at a fixed position throughout and also moving with the injection cycle.

We were unable to find a good position with the scrapers that did not produce significant scattering in the detectors.

Therefore we have moved the scrapers back to the fully out position.

Run 42 started.

We have increased the storage time to 10 reps (1 minute) in order to investigate the shoulders on the 3He peaks online and whether it is likely from injection. I think it is likely just a calibration issue

D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u). See previous entry for beamcalc.

Beam calc - Attachment 1

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 60 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30.0K, T2=31.6K.

Nozzle position x=-2.96, z=1.72 mm

YR09-Etarget pressure = 2.0e-10 mbar.

Cooler set value = 439 V, 15 mA. Read value = 439.81 V, 12.88 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=-1.5 mm

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

Data rate ~ 416kB/s

slow comparator threshold to 0x24 (360 keV)

Run 41 started.

D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u). See previous entry for beamcalc.

Beam calc - Attachment 1

Target density is about 3e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 25 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30.0K, T2=31.9K.

Nozzle position x=-2.96, z=1.72 mm

YR09-Etarget pressure = 2.0e-10 mbar.

Cooler set value = 439 V, 15 mA. Read value = 439.81 V, 12.88 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=-1.5 mm

Beam intensity ~3e8 on bunched beam, 3e8 on coasting. Gleb has increased the intensity this morning.

Data rate ~ 403kB/s

Lowered slow comparator threshold to 0x24 (360 keV)

13:20 Run stopped

Wolfgang tuning next beam energy

All checks fine

Total stats: 7827,4085,1821

OFFLINE CHECK

I have check Run41 and applied the gain calibration from 2024 in addition to a tigher EyEx energy cut (600 keV from 3 MeV for the online script). We no longer see the larger hump to the side of the 3He peak in DSSD1. See final attachment for comparison.

Note no time cuts have been applied to this spectra.and a more rigourous gain calibration using the igher energy D+ runs will likely improve things further. 

16:30

Run 40 started.

D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u)

Beam calc - Attachment 1

Target density is about 1e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 30 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30.1K, T2=31.9K.

Nozzle position x=-2.96, z=1.72 mm

YR09-Etarget pressure = 2.55e-10 mbar.

Cooler set value = 439 V, 15 mA. Read value = 439.81 V, 12.88 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=-1.5 mm

Beam intensity ~1e8 on bunched beam, 1e7 on coasting. This is less intensity than higher energies, may require an increase in the morning. 

Data rate ~ 403kB/s

Lowered slow comparator threshold to 0x24 (360 keV) since we decreased beam energy.

18:36

Temps OK - attached

Rates OK - attached

Merger OK - attached.

Spectra appear to have a flat background to the right of Rutherford that was not there at higher energies.

The xy plot also does not seem to be as centered.

21:17

Tems OK

Stats OK

Merger OK

Leakage current stable

Run continues OK

Ring vacuum 2E-10 mbar, likely getting less target.

02:00

Temps OK

Stats OK

Merger OK

Leakage current OK

Run continues - attached

Ring vacuum as before

04:20

Temps OK

Stats OK

Merger OK

L. current stable

Run continues

Ring vacuum as before

07:00

All checks OK

Leakage currents remain stable.

We have accumulated good statistics. 3He peak does seem a bit off. Cooling could be slightly off. Problem is not so bad looking at Ey compared to Ex. Online code uses pulser calibration only so may be a bit off depending on Ey/Ex.

Target density has been stable in the 1e12-2e12 at/cm2 range overnight. A bit more would be good.

Will ask on call operator to check cooling and try to increase intensity.

Run stopped gas target off.

07:30

Note during the tuning process we observed the same structure at 2.5 MeV in DSSD 1 as we did overnight that may overlap with the 3He peak. Perhaps it can be removed offline. See final attachment

08:45

Run 39 started.

D+ beam deuterium target. D+ beam energy is 1.0 MeV/u. (beam calc calculation is 1.0151 MeV/u)

Beam calc - Attachment 1

Target density is about 5e12 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=30.1K, T2=31.9K.

Nozzle position x=-2.96, z=1.72 mm

YR09-Etarget pressure = 2.55e-10 mbar.

Cooler set value = 575 V, 15 mA. Read value = 575.8 V, 12.9 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=-1.25 mm

Beam intensity ~1e8. We appear to lose intensity when reducing energy. It is still sufficient to for our purposes.

09.38

CRYRING vacuum and ambient temperature - attachments 2-3

09:58

All checks OK.

Target density is ~7e12 at/cm2

Data rate ~300kB/sec

All leakage currents look OK

After 1 hour we have 3671, 2515 and 1064 in each peak respectively. This is also logged on the google docs form in same tab as elog.

10:36

Temps OK

Data rate OK 326 kB/sec

Leakage currents stable

12:30

Temps ok - attach

Rates ok - attach

Merger ok - attach

14:20

Run stopped for energy change.