ELOG S1287

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

S1287

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Entry time:	Thu Nov 14 20:34:24 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 Encoding: HTML ELCode plain Suppress Email notification

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