ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Entry time:

Wed May 28 16:40:48 2025

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<p>We start a new run with real data taking condititon: beam is ok, target density is 1e12 cm-2, detectors are moving in-out periodically.</p>

<p>&nbsp;</p>

<p>Cooler voltage setpoint 1066.6 V. Read value 1068 V.</p>

<p>Current read = 0.01325 uA</p>

<p>Beam energy = 1.88 MeV/u (from HKR)</p>

<p>Attachment 1 - beamcalc with nominal values</p>

<p>Attachment 32 - beamcalc with actual values</p>

<p>&nbsp;</p>

<p>Right arm at 19.80 mm</p>

<p>Left&nbsp; arm IN at 77.56 mm (OUT 32.77 mm)</p>

<p>vertical beam position 0.0 mm</p>

<p>horizontal beam position&nbsp; -3.0mm</p>

<p>Beam intensity ~1.8e+7 particles.</p>

<p>Target density ~1e12 at/cm2</p>

<p>Target temperatures: T1=31.4 K T2=35.1 K</p>

<p>&nbsp;</p>

<p>17:48</p>

<p>aida01 fault &nbsp;&nbsp; &nbsp; 0x0 : &nbsp;&nbsp; &nbsp; 0x1 : &nbsp;&nbsp; &nbsp; 1 &nbsp;<br />
FPGA Timestamp error counter test result: Passed 15, Failed 1</p>

<p>All checks OK.</p>

<p>The electron current from beamcalc is the setvalue.</p>

<p>&nbsp;</p>

<p>18:51</p>

<p>aida01 fault &nbsp;&nbsp; &nbsp; 0x0 : &nbsp;&nbsp; &nbsp; 0x1 : &nbsp;&nbsp; &nbsp; 1 &nbsp;<br />
FPGA Timestamp error counter test result: Passed 15, Failed 1</p>

<p>All checks OK.</p>

<p>20:20</p>

<p>aida01 fault &nbsp;&nbsp; &nbsp; 0x0 : &nbsp;&nbsp; &nbsp; 0x1 : &nbsp;&nbsp; &nbsp; 1 &nbsp;<br />
FPGA Timestamp error counter test result: Passed 15, Failed 1</p>

<p>All checks OK.</p>

<p>22:02</p>

<p>&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; Base &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;Current &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;Difference<br />
aida01 fault &nbsp;&nbsp; &nbsp; 0x0 : &nbsp;&nbsp; &nbsp; 0x1 : &nbsp;&nbsp; &nbsp; 1 &nbsp;<br />
FPGA Timestamp error counter test result: Passed 15, Failed 1</p>

<p>All checks OK.</p>

<p>&nbsp;</p>

<p>23:13</p>

<p>All checks OK. Target stabilized at ~6.7E11 at/cm^2</p>

<p>00:23</p>

<p>All checks good.</p>

<p>01:01</p>

<p><strong>We are observing what seems to be a steady decrease of the target density</strong>, currently at around 5e11 at/cm2, whihc also seems to be following a decrease in the temperature T2.</p>

<p>1;40</p>

<p>All checks good. Spectra attached in att. 18. Target density still decreasing (3.7E11 at/vcm2)2</p>

<p>2:54</p>

<p>All checks ok. Attached rates and spectra in att. 19-20. target density decreased as continued, now around 2.5E11 at/cm^2.</p>

<p>We tried to move a bit around the nozzle/target, no effect.</p>

<p>Gone back to original value of x=1000, y=-4200.</p>

<p>Moreover, the screen with the program to move the detector seems to be bugged (gray background, a double window): however, the potentiometer value is chnaging and I see the usual effect of detector moving on the statistics, so i think it is fine</p>

<p>3:38</p>

<p>Checks Ok. Target 2.5E11 at/cm2</p>

<p>4:05</p>

<p>The bug disappeared</p>

<p>4:56</p>

<p><strong>Target density is now 1.9E11 at/cm2. It is very low with respect to before, but our reasoning is that nothing can be done about it at night anyway (apart from moving the nozzle, which we tried without effect). O. pointed out that the beam lifetime is still such that the beam is gone before the next injection.</strong></p>

<p>Checks ok. Attachments 21-22 spectra and xy plot. Some structure in top left?</p>

<p>06:00</p>

<p>All check ok. Target density 1.8E11 at/cm2</p>

<p>6:49</p>

<p>all goo, target 1.7E11 at/cm2</p>

<p><strong>07:30</strong></p>

<p>All checks ok, except timestamp (15 passed, 1 failed, see screenshot)</p>

<p><strong>8:30</strong></p>

<p>Tried moving the nozzle. Minor improvement in target density only. x=-1000 y=-4200</p>

<p>Stopped writing to disk while moving nozzle and stopped the motors. Restarted everything and moved to run 29 - no differences vs. 28.</p>

<p><strong>09:11</strong></p>

<p>Temps OK.</p>

<p>Nautilus does not respond to user commands. Attempint to make it work again without rebooting.</p>

<p><strong>10:05</strong></p>

<p>Stopped to reconsider which arm we are moving. Started to move arms around. Decided to stick with left arm.</p>

<p>Started run 30. Same as 28 and 29.</p>

<p>&nbsp;</p>

<p><strong>10:30</strong></p>

<p>Temps OK - attach</p>

<p>Rates OK - attach</p>

<p>Stats OK (taken with arm in) - attach</p>

<p>Current histogram attached</p>

<p>&nbsp;</p>

<p><strong>11:40</strong></p>

<p>Something happened to leakage currents. We see an increase in the top-right detector (which recovered) and a decrease in the bottom-right. Neither is moving.</p>

<p>No changes to left arm detectors, which are moving.</p>

<p>Temperature in the cave stable. No effects on the DAQ.</p>

<p>Temps OK</p>

<p>Rates in aida06 at 10k. Fast discriminator at 100k. Checkloaded. OK. Other rates fine.</p>

<p>Will keep monitoring.</p>

<p>&nbsp;</p>

<p><strong>11:50</strong></p>

<p>aida06 fast discriminator over 100k. Checkloaded x2. OK now. Other rates fine.</p>

<p>No changes to leakage current.</p>

<p>&nbsp;</p>

<p><strong>13:20</strong></p>

<p>Temps OK</p>

<p>Rates OK (aida 06 is no longer counting fast)</p>

<p>Leakage current stable</p>

<p>&nbsp;</p>

<p><strong>14:20</strong></p>

<p>Run continues OK</p>

<p>Temps OK</p>

<p>Stats OK</p>

<hr />

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