 Thu Jul 29 09:01:11 2004, Doug Preddy, Quench Recovery, switched to parallel cold
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| Changed to series mode. |
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Thu Jul 29 13:25:29 2004, Doug Preddy, Quench Recovery, start flow to power leads
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Sat Aug 7 22:37:04 2004, Willy Andersson, Quench Recovery, Compressor tripped off.
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Got a call at about 10:00 this morning, the whole system had tripped off.
No power bumps or other disturbances. When I arrived the only fault
indications were "ColdBox Trip" light on the compressor panel and on the
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Sat Aug 7 23:40:47 2004, Willy Andersson, Quench Recovery, Energizing solenoid
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23:39 Powerleads cold, LHe level over 40% and rising. Energizing solenoid
to 500 Amps, ramp rate 60. Checking compressor building then going home. |
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Thu Sep 2 21:58:34 2004, Willy Andersson, Quench Recovery, Switch to series cooling
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Solenoid had tripped on powerlead overtemp at about 09:00 this morning.
Doug recovered the system to // cooling. I switched system to series
cooling at about 21:30. LHe level at about 10%. Buffer tank pressure is low
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Fri Sep 3 01:28:43 2004, Doug Preddy, Quench Recovery, power up
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started flow to the power leads at 11:30. Cold and stable at 1:00am.
Energized solenoid at 1:30. |
Tue Nov 23 07:47:00 2004, Doug Preddy, Quench Recovery, Solenoid quench Nov 21 
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Solenoid quenched Nov 21 due to alarge power bump. Everything tripped off
including vacuum and water pumps. Cold box vacuum was at 3.6e-1, so pumped
it out overnight.
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Tue Nov 23 09:30:15 2004, Doug Preddy, Quench Recovery, started flow to solenoid
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| Started flow to solenoid in parallel warm return. |
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Tue Nov 23 11:35:44 2004, Doug Preddy, Quench Recovery, Another power bump
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Compressor tripped off again due to a power bump. Meson hall water off, so
vacuum pumps off again.
Pumps back on , vacuum pumps on, starting compressor. |
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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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Sun Nov 28 10:15:18 2004, Willy Andersson, Quench Recovery, Powerlead quench ?
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Got page very early this morning. Couldn't come in til 08:30. System was
in idle running mode and someone had reset the QRL panel so my guess is
that the solenoid tripped on powerlead overtemp. HIC142 was not fully open
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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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Thu Jun 9 21:41:25 2005, Willy Andersson, Quench Recovery, Trying to achieve stable cooling.
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From about 08:00 to 15:00
See Doug's previous entry for quench recovery details.
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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. |