AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CIRCE
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Entry time:
Thu Nov 27 12:55:03 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>On 22/11/2018 in the afternoon:</p> <p>We increased the ADC thresholds to 40 (previously 8).</p> <p>For an alpha source with pulser connected, the event multiplicity dropped from ~63 to ~10. Dead time ~ 7%</p> <p>Checking the timing signals for the near S2:</p> <ul> <li>RAL X channels 0 - 5 bad, 6 and 7 good -> disconnected timing</li> <li>RAL U, XII, XIII, R, and S good</li> <li>RAL W channels 0 - 5 good, 6 and 7 bad</li> <li>RAL Q all bad -> disconnected timing</li> </ul> <p>Started alpha source run with pulser (same pulser settings as run before)</p> <ul> <li>Run # 181122161955</li> </ul> <p>After run the Far S2 RAL thresholds set to 10mV, the close S2 thresholds set to 50mV</p> <p>Started alpha source run, no pulser</p> <ul> <li>Run # 181122170947</li> </ul> <p>Stopped run due to poor alpha rate -> ECL-Nim ribbon cable disconnected.</p> <p>Checking bias:</p> <ul> <li>Far S2 bias = -130V, leak I = 1.91uA</li> <li>Close S2 bias = -129.9V, leak I = 13.11uA</li> <li>diode bias = -70V, leak I = 0uA</li> </ul> <p>Vented chamber and checked 12um mylar foil in front of close S2 - no visual damage. LEft</p> <p>Close detector changed: S2 2623-26 (505um) replaced with S2 2623-18 (508um). Mounted new S2 in close position with 12um mylar</p> <p>Removed alpha source - needed by other experiment. Otherwise target ladder configuration is same as eLog entry #47</p> <p>Checked grounding cables going from preamps to ICU boxes were tightly connected</p> <p>Attempted to bias close S2 -> no leak current! Left lab for the day.</p> <p>The next morning (23/11/2018):</p> <p>We found the BNC - SMC bulkhead connector attached to the near S2 preamp box is missing a pin. We dismounted the near S2.</p> <p>We observed ~50kHz noise on Far S2, this is removed when we lifted the preamp - ICU box ribbon cables away from the chamber vacuum gauges.</p></td> </tr> </tbody> </table> </p><p> </p>
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