 Tue Nov 23 15:10:06 2004, Doug Preddy, Quench Recovery, switched to parallel cold return mode
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Wed Nov 24 14:58:42 2004, Doug Preddy, Quench Recovery, today
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Came in this morning to find the helium return line to the buffer tank
frosted up. MV51 has been stuck open the whole time. That exlains the
cooldown rate and other problem. Cycled MV51 a few times and it now seems
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Thu Nov 25 07:21:37 2004, Doug Preddy, Quench Recovery, started power lead flow
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Curtis switched to series mode last night at 7:00.
Startedflow to power leads at 7:00 this morning. |
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Mon Nov 29 09:28:16 2004, Doug Preddy, Normal Running, Buffer tank empty
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Came down to check on system. CV211 was fully open, trying to charge the
system. Ripples on LHe in and PL neg. CV141 fully closed. I closed CV147 to
0.45 to try and move CV141 open. Checked the buffer tank pressure, it was
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Wed Dec 1 12:55:56 2004, Doug Preddy, Normal Running, added one bottle helium gas
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| buffer tank pressure is up to 6.5 psi. |
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Thu Dec 2 10:51:16 2004, Doug Preddy, Normal Running, power lead ripple
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Ripples got worse overnight.LHe in 10.3-11.7, PL Neg 8.0-8.7. Flows <200mm.
cycled CV142. Flows 240mm. LHe in 10.3-11.3 PL Neg 7.9-8.1 |
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Sun Dec 5 11:15:24 2004, Doug Preddy, Normal Running, more ripples
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I loked at the power lead temps this morning. LHe_in 10.4-12.0 PL-Neg 8.0-
9.0 PL-Pos 9.8-10.4. Flows down to 160mm. Called Ops and got Danica to
cycle CV142. Ripples and flow improved on the second try. |
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Fri Mar 11 09:18:30 2005, Doug Preddy, Maintenance, services on system
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The cold box was isolated and pumped out after it warmed up. It has been
refilled with helium.
Turbine 2 speed indicator failed at some time during the last run. After
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Mon Apr 18 09:52:11 2005, Doug Preddy, Maintenance, Relays replaced
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The following relays have been replaced in the Sulzer control panel:
K341, K379, K132, K324A, K314, K125, K127, K133, K252, K227, K233, K238,
K239, K245, K246.
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Thu May 19 15:05:31 2005, Doug Preddy, Maintenance, STA 120 replaced 
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The turbine 2 speed indicator control box STA 120 has been replaced with a
newer style Jaquet controller. This is similar to the ones used in the
ISAC helium liquifier. See attached photos for set up parameters. These
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Wed Jun 1 08:23:19 2005, Doug Preddy, Start Up, start up notes
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The solenoid was pumped out Monday and yesterday after the quads just
downstream of the solenoid were put back in place. The quad just
downstream of the solenoid was remove to replace two coils on it.
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Wed Jun 1 23:48:02 2005, Doug Preddy, Quench Recovery, the first quench
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I recieved a call from ops at 22:00 tonight that the solenoid had alarmed.
I came in and found a cold box fault, with the compressor tripped off. I
was unable to restart the compressor. I cleared the cryostat quench and
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Thu Jun 2 01:26:30 2005, Doug Preddy, Quench Recovery, started flow to solenoid
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| See attached file for a screen grab of temps. |
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Thu Jun 2 01:38:25 2005, Doug Preddy, Quench Recovery, strip tool plot
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| This is a strip tool plot of the cooldown |
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Thu Jun 2 09:16:40 2005, Doug Preddy, Quench Recovery, continuing to cool
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| See screen grab |
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Thu Jun 9 08:56:10 2005, Doug Preddy, Quench Recovery, system back on
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The compressor was restarted and the solenoid is cooling (sort of) in
parallel cold return. |
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Tue Jun 14 20:53:19 2005, Doug Preddy, Quench Recovery, restarted refrigerator after power bump
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see bitmap for temps/pressures after presurrizing coldbox. Preparing to
start flow to turbines, then will start flow to solenoid in parallel warm
return. |
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Tue Jun 14 23:01:22 2005, Doug Preddy, Quench Recovery, switched to parallel cold return
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Mon Jul 18 11:18:40 2005, Doug Preddy, Quench Recovery, Solenoid Quenched over the weekend
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The solenoid was found to be warm on Monday morning. M9Q3 had a bad water
leak over the weekend. The water header serving Q3 was turned off and the
leak confirmed. Q3 was isolated and the header was turned back on. My
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Mon Jul 18 15:51:17 2005, Doug Preddy, Quench Recovery, Compressor restarted, flow to solenoid
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Recovered the vacuum in the solenoid, then started the compressor.
Started flow to solenoid in parallel warm return. |