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S1287
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S1447 23Na(a,p)
S1540
S1381
S1847 Catania
S1287
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Entry time:
Thu Nov 14 20:54:50 2024
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11.15 See attachment 1 for overnight EPICS log of TUDA2.CG5 Downstream flange *not* secured by four bolts Current pressure 0.97Torr - rate of increase ~0.2 Torr/5h This history is very similar to the previous test (with the flange secured by four bolts) - see https://elog.triumf.ca/Tuda/S1287/10 Conclude - leak-in rate not affected by (i) lack of bolts securing downstream flange, (ii) addition of cabling within TUDA chamber - provided that the TUDA chamber has previously been pumped to 'good' vacuum (< 1E-05Torr, say). 16.40 Modified preamp services cabling to avoid unterminated test - input to PD preamp which causes reflections to previous test - inputs to the S2 preamps. +/-15V PSUs #1 +15V/0.25A -15V/0.1A (1x 16ch PD preamp + 1x MSL type W preamp - not installed) #2 +15V/1.5A -15V/0.55A (2x MSL type S2 + 1x 16ch PD preamp units) 16.51 Time to 250mTorr ~14m Time from 250mTorr to 4.75E-05Torr ~40m See attachment 2 17.50 FTS RS44 set point +5.5 deg C 18.48 TUDA2.PNG5 7.8E-06Torr FTS RS44 set point +21 deg C Cryo pump gate valve closed Turbo pump off Four bolts securing downstream flange removed Vent to c. 300mbar with *He* N.B. TUDA2.CG5 reads 770 Torr with 300mBar of He in TUDA chamber MKS Baratron (capacitance manometer - gas independent reading) attached to manual vent port of the Varian V550 turbo pump Pressure reading at 'good' vacuum 0.0 Torr - no offset Bourdon MKS S2 preamp Baratron Thermocouple (mBar) (Torr) (deg C) 19.08 300 221.7 19.18 300 222.0 +19 19.28 300 222.1 +20 19.38 300 222.3 +20 19.48 300 222.4 +21 20.08 300 222.6 +21
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ELOG V2.9.2-2455