<p>Run 42 - 15:00</p>
<p>Detectors IN (left arm pot =36.54 mm, right arm pot = 70.49 mm). Stationary. Same as run 40</p>
<p>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.</p>
<p>Target density is 5.03e11 at/cm2, ring pressure looks OK YR09 2.36e-10 mbar.</p>
<p>Horizontal beam position is -7.5 mm, vertical beam position is 0.0 mm. Same as run 40.</p>
<p>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.</p>
<p>Statistics, merger statistics, histograms all zero'd</p>
<p>System wide checks ok. Temperatures ok. Leakage current ok. Merger ok.</p>
<p>Attatchment 1: Stats</p>
<p>Attatchment 2: Temperatures</p>
<p>Attatchments 3-6: Waveforms</p>
<p>Attatchment 7:Leakage current</p>
<p>Attatchment 8: Monitoring code rates</p>
<p> </p>
<p> </p>
<p>15.35 DSSSD #0 leakage current trending somewhat upwards cf. somewhat downwards for DSSSD #1-3</p>
<p> ML CRYRING hall ambient temprature c. 17.7. deg C and on downward trend.</p>
<p> Probably indicates radiation damage/surface charging of DSSSD #0 - leave DSSSD #0 biased for 24-48h following run and monitor leakage current</p>
<p>15:46</p>
<p>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.</p>
<p>16:45</p>
<p>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.</p>
<p>17:00</p>
<p>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.</p>
<p>Attatchment 1:1 Stats</p>
<p>Attatchment 12: Temperatures</p>
<p>Attatchments 13-16: Waveforms</p>
<p>Attatchment 17:Leakage current</p>
<p>Attatchment 18: Monitoring code rates</p>
<p>17:10</p>
<p>HKR cryring asked for target to be removed to check intensity. Target was removed.</p>
<p>17:17</p>
<p>Target back in, intensity back to around 2.5e7. Stable. Target desity 5e11.</p>
<p>18:42</p>
<p>All system checks and tempeatures ok. Beam stable. Target 2.3e11.</p>
<p>Leakage current: red line still trending upwards but slowly. See image 24.</p>
<p>10:30</p>
<p>Beam went down about 21:45. Called HKR and they were able to almost immediately restore the beam. Beam intensity ~2.5e7.</p>
<p>Target density 5.6e11 at/cm2, pressure in YR09 ~2.5e-10 mbar.</p>
<p>FEE temps and system check OK</p>
<p>Merger and tape server OK</p>
<p>Merger stats (attachment 25)</p>
<p>All rates in spectrum browser look OK</p>
<p>Monitoring code rates indicate beam on target.</p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p> |