 Thu Jul 20 13:21:57 2006, Willy Andersson, Quench Recovery, started // warm return flow.
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TIC121 was down to 27K
warm return valves were wide open
opened supply valves CV143 and CV146.
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Thu Jul 20 13:27:21 2006, Willy Andersson, Quench Recovery, cold return mode continues...
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cr_c1 and cr_12 are both at about 45K and heading slowly down, so the
gamble of going to // cold return worked. Maximum opening of CV155 is
limited by CV204 goes fully closed and suction pressure begins to rise
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Thu Jul 20 13:34:26 2006, Willy Andersson, Quench Recovery, cold return mode continues...
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Even though cr_c1 and cr_c12 have begun to tick down, cr_c7 and cr_c6 are
actually ticking up. This is probably a wave of warming propagating through
the solenoid. As long as the two inlets are falling in temperature then
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Fri Jul 21 07:39:37 2006, Doug Preddy, Quench Recovery, Cool down continues
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| Raised PIC229 to 11Bar. Started to close HIC155. Cooling rates improve. |
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Fri Jul 21 14:08:04 2006, Doug Preddy, Quench Recovery, switch to series mode
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| Coils temps <10K.Switching to series mode. |
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Fri Jul 21 17:18:19 2006, Willy Andersson, Quench Recovery, Opened HIC142 fully open
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| Power leads have flatlined but still building LHe level. |
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Fri Jul 21 23:36:21 2006, Doug Preddy, Quench Recovery, Final cooldown problems
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80K shield is down to <60K Liquid level not building. Power leads rippling
and warming. T1 inlet 85K with 10%heater load.
Lowered the set point of TI121 to 17K. Shut off flow to the 80K shield to
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Sat Jul 22 06:34:14 2006, Experimentor, Quench Recovery, looking good
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Donald Arseneau reporting.
It is looking pretty good, so I came back in with the intent of energizing
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Fri Jul 28 20:39:40 2006, Doug Preddy, Quench Recovery, Restarting refrigerator
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Solenoid quenched at about 6:00 tonight.
I restarted the compressor, then the cold box and turbines. When cold box
was at 25K I started flow to the solenoid in parallel cold return. |
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Sat Jul 29 05:30:28 2006, Doug Preddy, Quench Recovery, switched to series mode
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| Temps bottomed out at ~16K. Switching to series mode. |
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Sat Jul 29 09:38:06 2006, Doug Preddy, Quench Recovery, power leads cooled
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opened power lead flow about 40 minutes ago. ~12K will let them stablize.
LHE level >20% |
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Tue Aug 8 07:27:49 2006, Doug Preddy, Quench Recovery, Solenoid Quench at about 6:00 this morning
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No indication of problem. Turbines still running, but no flow to solenoid.
Started flow. Solenoid ~20K. |
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Wed Aug 9 06:44:58 2006, Willy Andersson, Quench Recovery, // cold mode cooling continues.
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After restarting flow to the solenoid yesterday in // cold return mode
TIC121 just refused to go lower than about 29K even when we closed CV155
all the way. Tried various things, switching to // warm return, changing
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Wed Aug 9 06:59:43 2006, Willy Andersson, Quench Recovery, more // cold return stuff
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About 21:00 last night the solenoid temps had not changed much, pretty well
flat lined. I guess my reducing CV155 stalled the cooling. Called Don
Arseneau and asked him to increase CV155 to about 80% open. Temps slowly
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Wed Aug 9 07:50:49 2006, Doug Preddy, Quench Recovery, Switched to series mode.
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| Cool down continues. |
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Thu Aug 10 16:33:11 2006, Willy Andersson, Quench Recovery, Flow to solenoid tripped on powerlead temperature.
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Power lead temps were drifting up, tried to tweak TIC121 and HIC141 to
unstall powerlead flow. Got quench. Restarted series flow, building LHe
level. |
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Thu Aug 10 20:26:09 2006, Willy Andersson, Quench Recovery, solenoid energized
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| Powerleads seem stable. |
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Tue Aug 15 08:45:56 2006, Doug Preddy, Quench Recovery, restarted the compressor
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| Solenoid tripped off Sunday. Restarted compressor and cool down of cold box. |
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Tue Aug 15 15:39:27 2006, Willy Andersson, Quench Recovery, switched to parallel cold return
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Return flow temps from solenoid about 40K, TIC121 at about 40K so switching
to //cold return.
Starting with slightly reduced flow through cold returns, CV145 and CV147
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Thu Aug 17 08:04:44 2006, Doug Preddy, Quench Recovery, Solenoid tripped at about 3:00 this morning
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restarting system.
Compressor would not start. Idid not see anything that would not let it
start. Pushed rest button upstairs, and reset contactor. Compressor started.
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