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 Apr 4 07:19:03 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 19/11/2018:</p> <p>During the vacuum test - see eLog entry #43 we performed noise tests on the preamplifiers with no S2 detector connected</p> <p>First we performed a "tabletop" test - the preamplifiers were not connected to the chamber.</p> <p>Preamp I for the near S2 is connected to RAL modules (reading left to right): X, XII, XIII, R, S, Q, U, and W, via long (~5m) preamp - ICU cables 13, 14, 15, and 16</p> <p>Preamp II for the far S2 is connected to RAL modules (reading left to right): I, II, XI, IV, V, VI, VII, VIII, via long (~5m) preamp - ICU cables 0, 1, 2, and 3</p> <p>We powered preamps I and II with + and - 15V. The power supply shows the correct currents drawn: ~1.5A for +ve and ~0.75A for -ve</p> <p>We found our test 16 pin cables #45 had a dead channel 0, we switched to cable #46 which shows all 8 channels working.</p> <p>We found the following dead channels on the RAL modules:</p> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <tbody> <tr> <td>RAL</td> <td>CH #</td> </tr> <tr> <td>U</td> <td>0</td> </tr> <tr> <td>W</td> <td>0, 7</td> </tr> <tr> <td>I</td> <td>0, 5 (Both disabled in ICU)</td> </tr> <tr> <td>II</td> <td> <p>0, 2</p> </td> </tr> </tbody> </table> <p>We mounted preamps I and II to the top of the chamber. We mounted preamp I on the far S2 mount and preamp II on the near S2 mount, however we were not connecting to the S2's and so continued with the electronics tests.</p> <p>Now we saw the following dead channels on the RAL modules:</p> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <tbody> <tr> <td>RAL</td> <td>CH #</td> </tr> <tr> <td>W</td> <td>7</td> </tr> <tr> <td>I</td> <td>0, 5 (disabled in ICU)</td> </tr> <tr> <td>II</td> <td>0, 2</td> </tr> </tbody> </table> <p>We checked the signal to noise ratio for RAL X CH0:</p> <p>The input pulser amplitude = 50mV, the RAL analogue amplitude = 950 mV, the RMS noise = 40mV. The S/N ~4.2%.</p> <p>We stopped tests for the day.</p></td> </tr> </tbody> </table> </p><p> </p>
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