Tuda logbooks General E1104 ISACII E1195 E1103 E1147 S1287 S1203 S1233 S1284 S1447 23Na(a,p) S1540 S1381  S1847 Catania

S1287

Fields marked with * are required Entry time: Thu Nov 14 21:01:04 2024 Author*: Type: - please select - Routine Other Category: - please select - General Other Subject: > > 10.02 See attachment 1 for overnight EPICS log of TUDA2.CG5 > Downstream flange secured by four bolts > Current pressure 1.07Torr - rate of increase ~0.2 Torr/5h > > 11.30 TUDA chamber pumped down to ~800mbar > Downstream flange bolts removed - no change in pressure observed > N2 bottle connected to TUDA vent valve - to vent and (hopefully) > exceed atmospheric pressure forcing downstream flange to move open > Pressure measured using MKS Baratron 1000Torr gauge > > Result - pressure increased from 800 to ~1000mbar in ~45s > TUDA chamber pressure did not noticably exceed atmospheric > pressure and there was no obvious movement of downstream flange. > Gas could be felt escaping from sides of downstream flange. > > Conclude - contact with downstream flange O-ring failed at, or near, > atmospheric pressure - this prevented buildup in excess of atmospheric > pressure > > 11.50 Installed: > > preamp services (+/-15V preamp power, +/- preamp test inputs) - 10-way IDC > ribbon cables > > detector HT - SMC/BNC cabling > > preamp signals - 34-way IDC twist-n-flat ribbon cables > > preamp thermocouple attached to an S2-1 preamplifier > > 15.00 Time to 250mTorr ~14m > Time from 250mTorr to 4.75E-5Torr ~45m > See attachment 2 > > 16.04 FTS RS44 set point +5.5 deg C > > 16.21 FTS RS44 temperature +5.6 deg C > > 17.12 TUDA2.PNG5 8.2E-06Torr > FTS RS44 temperature +5.8 deg C > Preamp thermocouple +8 deg C > > 17.13 +/-15V preamp power ON > > 17.18 Preamp thermocouple +14 deg C > TUDA2.PNG5 8.0E-06Torr > > 17.23 Preamp thermocouple +14 deg C > TUDA2.PNG5 7.9E-06Torr > > 17.28 Preamp thermocouple +15 deg C > TUDA2.PNG5 7.7E-06Torr > > 17.43 Preamp thermocouple +15 deg C > TUDA2.PNG5 7.0E-06Torr > > CAEN SY403 HV mainframe > > Channel HT Detector Bias I_L > (V) (uA) > > 1 1 S2-1 -130 -0.03 > 2 2 S2-2 -130 -0.06 > 3 3 W -250 -0.02 > 4 4 PD -30 -0.03 > > Low leakage currents as expected - no evidence of high resistance > shorts > > All other channels set to 0V > > +/-15V PSUs > > #1 +15V/0A -15V/0A (MSL type W preamp not installed) > #2 +15V/1.65A -15V/0.65A (2x MSL type S2 + 1x 16ch PD preamp units) > > 17.58 Preamp thermocouple +13 deg C > TUDA2.PNG5 6.3E-06Torr > > 18.13 Preamp thermocouple +12 deg C > TUDA2.PNG5 5.8-06Torr > > 18.29 Preamp thermocouple +12 deg C > TUDA2.PNG5 5.3-06Torr > > 18.32 +/-15V preamp power OFF > FTS RS44 set point +21 deg C > > 18.39 Cryo gate valve closed > Turbo off and isolated > 4x bolts securing downstream flange removed > > Repeat yesterday's leak-in test (bolts removed) > > Encoding: HTML   ELCode   plain   Suppress Email notification Attachment 1:

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