AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CARME
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Sat Aug 16 05:39:56 2025
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>23:40</p> <p>Offline anlaysis shows two clear peaks for DSSD1 and 2 at very low energies close to the threshold. One must be elastics and the other a noise peak.</p> <p>For DSSD3 the noise level is so exceptionally high due to the low threshold that nothing can be discerned from background.</p> <p>Therefore I decided to stop the previous run and increase the slow comparator threshold for DSSD3 from 50 keV to 80 keV (same as DSSD2).</p> <p>Run 65 started.</p> <p>150 keV/u beam on target, Target overlap confirmed with lifetime measurement using bunched beam.</p> <p>Detectors in with servos only. Both arms are IN and stationary.</p> <p>Left potentiometer = 36.54 mm</p> <p>Right potentiometer = 37.96 mm</p> <p>Data rate has dropped to 1.5 MB/sec and merger is between 600k and 900k.</p> <p>Stats attached at new thresholds.</p> <p>Stats zero'd to see number of pause and resume overnight.</p> <p>02:30</p> <p>Some reaction counts visible on monitoring histograms (rate v low)</p> <p>Checks OK, same fee (aida16 fails clock and adc as before)</p> <p>pause info items after a few hours attached</p> <p>05:00</p> <p>We see the peaks much more clearly now. Rate is low but they are there. Target density looks like it has been fluctuating in the low 10^12 region. </p> <p>Note for this energy with 1e8 pps, 1e12 target density I estimate ~2 counts/h per detector for the 3He peak.from our spreadsheet calculator. After 6 hours of this run I saw about 10-15 counts in the peak of DSSD2, perhaps the same in DSSD3. DSSD1 has missing strips so is harder to see. This rate is about 48 hours for 5% (if we had 4 dssds). </p> <p>Checks OK</p> <p>Leakage current of dssd4 has been stable at 40V for a while now. Pushed voltage up to 75V with leakage current stable. At 80V it started to go over current</p> <p>Turned bias to 60V and have left on at this level. It looks stable. Perhaps in the morning it can be pushed to close to 100V.</p> <p> </p> <p><strong>0</strong><strong>7:15</strong></p> <p>Temps OK</p> <p>System wide checks: 16 fails ADC calibration, 14 fails WR decoder</p> <p>Rates OK, some Pause/resume statementes overnight. See attached x2</p> <p>Merger OK. 1.5 Mb/s</p> <p>Peaks clearly visible in two detectors.</p> <p> </p> <p><strong>08:25</strong> All checks OK. DSSD 4 to 75V - OK.</p> <p><strong>09:10 </strong>All checks OK. DSSD 4 to 80V. Trying to improve target (2-4E12).</p></td> </tr> </tbody> </table> </p><p> </p>
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