Run 42 - 15:00
Detectors IN (left arm pot =36.54 mm, right arm pot = 70.49 mm). Stationary. Same as run 40
Electron cooler voltage 751.89 V this corresponds to 1.3444 MeV/u. This should be on the right of the peak of the resonance.
Target density is 5.03e11 at/cm2, ring pressure looks OK YR09 2.36e-10 mbar.
Horizontal beam position is -7.5 mm, vertical beam position is 0.0 mm. Same as run 40.
Beam is in the ring for 4 seconds and total cycle time between injections is 8 seconds. Notice this is the samet as run 40, different to run 35.
Statistics, merger statistics, histograms all zero'd
System wide checks ok. Temperatures ok. Leakage current ok. Merger ok.
Attatchment 1: Stats
Attatchment 2: Temperatures
Attatchments 3-6: Waveforms
Attatchment 7:Leakage current
Attatchment 8: Monitoring code rates
15.35 DSSSD #0 leakage current trending somewhat upwards cf. somewhat downwards for DSSSD #1-3
ML CRYRING hall ambient temprature c. 17.7. deg C and on downward trend.
Probably indicates radiation damage/surface charging of DSSSD #0 - leave DSSSD #0 biased for 24-48h following run and monitor leakage current
15:46
Seeing some beam intensity drops occasionally. Small drop that instantamnously went back up around 15:20 and then stbale beam unitl around 15:44 and then two small-time beam drops within 2 minutes. See attatchment 9. Continuing to monitor. Target density remains stable at 5e11.
16:45
Beam dropping again and continuing to drop (began at 16:35). Target density 4.7e11. Called HKR and they will try to increase the intensity. See attatchment 10.
17:00
System checks ok. Temperatures ok. Leakage current plot okay. Merger ok. Beam intensity still reduced to same amount as in attatchment 10). Target density approx 5e11.
Attatchment 1:1 Stats
Attatchment 12: Temperatures
Attatchments 13-16: Waveforms
Attatchment 17:Leakage current
Attatchment 18: Monitoring code rates
17:10
HKR cryring asked for target to be removed to check intensity. Target was removed.
17:17
Target back in, intensity back to around 2.5e7. Stable. Target desity 5e11.
18:42
All system checks and tempeatures ok. Beam stable. Target 2.3e11.
Leakage current: red line still trending upwards but slowly. See image 24.
10:30
Beam went down about 21:45. Called HKR and they were able to almost immediately restore the beam. Beam intensity ~2.5e7.
Target density 5.6e11 at/cm2, pressure in YR09 ~2.5e-10 mbar.
FEE temps and system check OK
Merger and tape server OK
Merger stats (attachment 25)
All rates in spectrum browser look OK
Monitoring code rates indicate beam on target.
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