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Entry time:
Thu Nov 14 20:14:56 2024
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> Continuation of yesterday's test with c. 300mBar of He > in the TUDA chamber. > > Bourdon MKS S2 preamp > Baratron Thermocouple > (mBar) (Torr) (deg C) > > 09.45 300 222.8 +21 > 10.44 300 222.9 +21 > 11.48 300 223.1 +22 > > 11.49 FTS RS44 set point +22.0 deg C > +/-15V preamp power ON > > 12.01 300 223.4 +26 FTS RS44 @ set point > 12.31 300 223.7 +26 > 13.00 300 223.9 +26 > > 13.01 FTS RS44 set point +15.0 deg C > > 13.11 300 223.4 +21 FTS RS44 @ set point > 13.41 300 223.0 +22 > 14.11 300 222.9 +22 > 15.14 300 222.9 +22 > 16.11 300 222.9 +22 > 17.11 300 223.1 +22 > 18.16 300 223.1 +22 > 19.10 300 223.2 +22 > 20.19 300 223.1 +21 > > 20.20 +/-15V preamp power OFF > FTS RS44 set point +20 deg C > > 20.25 Bolts securing downstream flange re-installed > - finger tight only > > 20.45 Vent TUDA chamber to air, i.e. chamber contains He & air > > See attachment 1. Conclude that the preamps can be operated with > the FTS RS44 recirculating chiller set point +15 deg C with 300mBar > of He. The S2-1 preamplifier thermocouple indicates that the preamplifiers > are operating at about ambient temperature with little apparent effect > on gas pressure. > > N.B. For vacuum operation, the FTS RS44 set point should be +5.5 deg C > > > > Pulser tests > > BNC PB-4 settings: > Amplitude 90,000 x5 attenuator IN > frequency 266Hz > delay MIN > tail pulse > t_r 50ns tau_d 1000us > INT ref > polarity + (for p+n junction strips, - for n+n ohmic strips) > > All ADC & TDC channels OK > > ADCs > > FWHM > Detector (ch) (keV) > > S2-1 p+n #23 1.6 30 > S2-1 n+n #8 1.6 30 > S2-2 p+n #23 1.7 15 > S2-2 n+n #8 1.8 16 > W p+n #8 2.2 19 } using signals > W n+n #8 4.3 37 } from S2-2 preamps > PD #0 1.7 81 > > TDCs (0.8ns/ch) > > Centroid FWHM > Detector (ch) (ch) > > S2-1 p+n #23 245 1.4 > S2-1 n+n #8 254 1.9 > S2-2 p+n #23 253 1.7 > S2-2 n+n #8 260 1.8 > W p+n #8 254 1.8 > W n+n #8 266 1.2 > PD #0 233 1.6
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ELOG V2.9.2-2455