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.

11.40 DAQ continues
      File G22-205/R38

      ASIC settings
       slow comparator 0x32 all FEE64s

      DSSSD bias & leakage current OK - attachments 1-2

      FEE64 temps OK - attachment 3

      ADC data item stats OK - attachment 4

      WR timestamps OK - attachment 5

      per FEE64 Rate spectra - attachment 6

      Merger & Tape Server - attachments 7-8
       filesystem /mnt/data1 4.7Tb remaining

      Online analysis - per DSSSD energy spectra - elastic peak max count / channel c. 250-300Hz - attachment 9

      CRYRING vacuum & temperature - attachments 10-12
       YR09 e-target gauge indicates vacuum transients from high e-11 to low e-9mbar presumably due to high density D2 target

11.42 All histograms & stats zero'd


17.36 DSSSD bias & leakage current OK - attachments 13-14

      FEE64 temps OK - attachment 15

      ADC data item stats OK - attachment 16

      per FEE64 Rate spectra - attachment 17

      per FEE64 1.8.L spectra - attachments 18-19
       aida11 p+n pulser peak width 63 ch FWHM 
       aida03 n+n pulser peak width 85 ch FWHM

      Merger - attachment 20

      Online analysis spectra - elastic peak max count / channel c. few Hz - attachment 21
       rates much lower than earlier - no beam and/or no target - alert JM

10:56

Run 38 started.

D+ beam deuterium target. D+ beam energy is 1.5 MeV/u. (beam calc calculation is 1.5160 MeV/u)

Beam calc - Attachment 1

Target density is about 8.5e12 at/cm2 after moving nozzle this morning.

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=-2.89, z=1.72 mm

YR09-Etarget pressure = 2.37e-10 mbar.

Cooler set value = 846V, 15 mA. Read value = 847.378V, 13.105mA

Detector 4 looks OK at the moment.

Beam position. Vertical =0.0mm , Horizontal=2.5mm

11:05

All checks OK

Data rate is ~300 kB/sec.

Leakage currents - attachments 2,3

17:56

Rates have dropped significantly. Do not see elastics peak. No beam?

18:23

Check in with HKR. The thunder and lightning storm appears to have knocked out the beam from 17:30 until 18:10.

Beam is now back with an intensity of 2e8 pps.

I have also adjusted the nozzle of the gas target slightly and recovered target pressure of 1e13 from 3e11 at/cm2. This has been stable for the last 15 minutes. I think during shifts we will require some nozzle modifications. It is not vital at higher energies but for energies during the week, we will need.

We again see the very nice elastic scattering pattern on our detector. I am concerned we may be some shadowing on our detector giving rise to the observed circle? Attachment 5

20:30

Checks all OK

Target density in last 30 mins ~1e13 at/cm2

DSSD4 still looking good and  stable

23:00

All checks OK.

Detectors all stable

Target density still in 1e13 range.

We have accumulated lots of stats! This run should provide an excellent run for energy calibration using elastics and reaction peaks.

We run overnight and change energy in the morning

01:00

All checks OK

Detectors stable

Target density stable 1e13.

05:00

All good still

07:05

Run stopped to change energy. Gas target off.

final statistics plot attached.

Leakage currents overnight also. DSSD4 had two transients during the night but recovered.

22:49

Run 37 started.

D+ beam deuterium target. D+ beam energy is 2 MeV/u. (beam calc calculation is 1.9211 MeV/u)

Target density is about 1.3e12 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=-3.11, z=1.77 mm

YR09-Etarget pressure = 1.04e-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.

23:30

Checks OK - high but managable rates from DSSD4

01:00

Checks OK - DSSD4 has settled down. Leakage current attachment 1

Ex energy histograms - attachment 2

X2go check on gas target shows density has dropped to 5e11 at/cm2 in last half an hour. 

03:56

Checks OK

DSSD had more issues but once more settled

Temps OK

Rates OK

DAQ continuing

06:00

Checks OK

08:00

We can now change to 1.5 MeV/u no storage mode enabled. 

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

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. 

08:27

No run going.

Temperatures OK - attach

Attempting to bias channel 3 again. Slowly ramping up.

V = 60, I = 5.3

V = 70, I = 6.1

V = 80, I = 9.0 --> 6.2 (unstable). Decreasing bias.

V = 70, I = 6.0 (stable again)

Leaving at 70 V for a while to condition (?)

Resetting the gnuplot graph. Old caen_current.dat moved to G22-205-caen_current.dat and copied in /TapeServer/G22-205

10:10

Temperatures OK

Leakage current on channel 3 showed some issues, back to stable. See attached.

11:00

Temps OK

Leakage current stable.

Increased bias on channel 3 to 80 V. I = 6.2 uA stable. Leaving for a while.

12:45

Temps OK

Leakage current stable

Increased bias on channel 3 to 90 V. I = 6.3 stable. Leaving for a while.

13:30

Temps OK

Leakage current stable.

Increased bias on channel 3 to 100V. I = 6.3 stable. Hopefully it holds until the end of the beam time.

20:00

Leakage current on channel 3 had issues again and bias was reduced to 50 V. Remained stable. Turned to 60 V now. Still stable. See attachement.

FEEs on detector for -> MEC

Temps OK - attach

Checks as before - attach

Rates OK (four fees not counting as expected) - attach

Deuterium beam in the ring at 2 MeV/A approx 2E8 pps, significant H2+ contamination.

Deuterium target working, fluctuating around 5E12-1E13 atoms/cm2

Vacuum in YR09 - 3E-10 mbar

Beginning beam-target overlap measurements soon.