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:

Fri Apr 15 11:00:17 2011

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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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Attachment 1:

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Attachment 2:

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Attachment 3:

ELOG V2.9.2-2455