Beam energy - 1.361 MeV/u
17:12
Run 28 Started - beam on target
Detectors IN (left arm pot = 36.5 mm, right arm pot = 70.5 mm)
Beam position (vertical offset -9mm, horizontal offset -7.5mm)
Ions circulate in the ring for 3 seconds before they are dumped. Total time between injections is 12 seconds.
Target density apporx 4.2e11 atoms/cm2, pressures in the ring are below 1e-10 mbar. (Attachment 1+2)
Leakage current plot (attachment 3) - change in leakage current is consistent with temperature variation from ML online plot.
18:18
FEE temperatures OK - aida09 is slightly hot - 65.06 C so slightly above vertex temp value of 65C and stays this way over several reloads (attachment 4)
System wide checks OK
Statistics (attachments 5+6) - aida09 and aida12 slightly high stats but still <1K. Check load does not resolve.
Tape server OK - writing ~730 kB/sec
Merger OK
Monitoring code XY plots and Ey energy histograms (attachments 7+8)
18:53 All checks OK
21:58
All system checks ok. Temperatures and leakage current ok. Merger ok.
Attatchment 9: Rates and stats - all below 1k
Attatchment 10: Temperatures
Attatchment 11-14: Waveforms layouts 1,2,7,8 respectively look okay
Attatchment 15: Leakge current
Attatchment 16: lowenergyXY plots
Vacuum pressure is ok.
23:01
system wide checks ok. Temperatures ok. Leakage current ok. Merger ok all went green. Waveforms same as 10pm check.
Statistics - aida09 and aida12 went over 1k (attach 17), but reloaded and settled down again seconds appart (attatch 18). Reloaded again at 23:14 and stats were aove 1k again (attatch 19).
Attatchment 20 is the leakage current, still ok.
Vacuum pressure ok (attatchment 21) - rises after small bump down from the regular value.
01:00
System wide checks ok. Temperatures ok. Leakage current ok (see attatchment 22). Merger ok all went green. Waveforms the same as 10pm check.
Statistics - aida09 and aida12 occasionally just over 1k when reloading a few times, but goes below mostly.
Vacuum pressure ok, stablised after small bump around 10ish (attatchment 23)
03:00
Ring vacuum suffered from long-term creep, especially in YR08. Tweaked nozzle position. Pressure improves, target density slightly affected. Attachment 24-25
Leakage current and temperature indicate we have an increase in temperature in the ring. This is confirmed by vacplot. Attachment 26-27
Merger continues OK 28
Rates and Stats show we have no beam. Going to the lab 29-30.
R28_22 NO BEAM
03:45
No beam in the ring, we are missing all the spills. Called HKR.
Detectors out in case beam manipulation is required.
Stat plot looked OK. 31
04:35
DAQ continues OK on run R28_24, still no beam
Temperatures slightly lower - OK
System wide checks - OK
Stats - OK
Merger - OK
05:44
Beam is back. It had been away since 1:30 am due to a fault in the new EC power supply. Fault reason unclear.
Detectors back in (left 36.54, right 70.49 mm)
R28_26 BEAM ON
(Beam likely off from R28_ 21-25 inclusive)
Temps as before
Stats now OK - att 32
Merger OK - att 33, 34
Stat spectra OK - att 35. Note slope in ASICS (Rutherford?)
Leakage current trending up - likely temperature related.
Ring pressure OK
Gas target 4.14E11
Beam at injection around 7.5E6. Could be higher. Asked for optimisation later today assuming current configuration holds.
06:59
Temperatures OK
System checks OK
Stats looking good in all FEEs except aida01 and aida15
Leakage current has levelled off - looks OK
Ring pressure looks OK and is trending down - target density 4.1e11
Merger and tape server OK
08:30
System checks all OK
Temperatures OK
Merger / tape server OK - data being written R28_29
Target density 4.1e11, ring pressure stable
09:00
Attachment 38 Spectrum browser stats for all FEEs (log scale)
Attachment 39-42 Spectrum browser *L histograms for select channels for each detector. MIDAS data is consistent with inline monitoring plots.
System checks OK
Beam still on - target density and ring pressure remain stable
11:28 We have access to the voltage dividers for the electron cooler. The voltage is -763.625 V. This corresponds to an electron energy of 746.795 eV and a beam energy of 1.361 MeV/u using ML ion calc.
This is above the resonance energy of 1.3435 MeV/u. We will now end the run and set the cooler voltage to this ion energy.
Run ended. Run 29 started while setting beam energy.
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