AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CIRCE
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Entry time:
Fri Mar 28 20:49:00 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 20/11/2018:</p> <p>At 9:00 we walked into the lab, David R reported he found all the pumps OFF. A thunderstorm occurred overnight causing a power outage.</p> <p>Last night we had switched off the electronics (Preamp power, RAL amp rack, and NIM bin).</p> <p>This morning we determined everything was ok to switch on.</p> <p>Using eLog entries #26 and #27 as reference we mounted the following detectors and foils:</p> <ul> <li>Far S2: 2323-18, 12um mylar</li> <li>Near S2: 2623-26, 12um mylar</li> <li>Silicon pin diode: 0.9um mylar</li> </ul> <p>The pin diode used in previous tests had something deposited (fingerprint?) on the crystal, so we replaced this with a new clean diode.</p> <p>We mounted the detectors and foils inside the chamber, the target ladder was kept in its configuration with all blank frames (see eLog entry # 41). See attached picture 1 for the 12um mylar mounted in front of the far S2.</p> <p>We mounted preamp I on the near position and preamp II on the far position, as will be used during the measurement.</p> <p>We sealed the chamber to ensure it was light tight.</p> <p>We applied pramp power, expected currents were drawn.</p> <p>With no S2 bias we see high noise on the majority of the RAL amplifiers for both preamps I and II. We switched off the lab lighting and found the chamber was indeed light tight - there were no observable changes in noise.</p> <p>We discovered CH2 of the Silena HV module does not supply bias.</p> <p>We applied -10V bias to both S2's. The far S2 is biased using CH1 and the near S2 is biased using CH4 of the HV module. The leakage currents read: Far S2 = 0.35uA, Near S2 = 1.81uA.</p> <p>With bias RAL X CH 0 baseline RMS noise ~ 55mV.</p> <p>We biased the pin diode with its operating -70V using CH3 of the HV module, leak I = 0.01uA.</p> <p>We decided to switch off all biases and prepare for tests under vacuum with an alpha source.</p> <p>CH1 and 4 of the HV module were set to -130V ready for the S2's</p> <p> </p> <p> </p></td> </tr> </tbody> </table> </p><p> </p>
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