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ID Date Author Operational Modedown Subject
  252   Fri Jul 25 21:48:15 2008 Doug PreddyQuench Recoveryanother quench
System was stable and solenoid ramped up at 4:00 today. At about 7:30 it tripped off again. I came in and restarted the compressor and am now cooling in parallel cold return mode. Solenoid is at ~30K. I talked to Kevin and he will get the power leads on tomorrow morning. Once they are stable the power supply can be ramped up. I phoned Curtis, but there was no answer (he may be on holidays??)
  253   Sat Jul 26 01:06:04 2008 Doug PreddyQuench RecoveryRefrigerator in series mode
Switched to series mode. Solenoid ~8K, starting to build liquid.
  254   Sat Jul 26 01:29:21 2008 Doug PreddyQuench Recoverypower leads
ops will monitor liquid level. When it's at 60% they will come down and open the power lead valve. When the temperature ripples die out the solenoid can be energized.
  255   Sat Aug 23 17:02:38 2008 Doug PreddyQuench RecoverySolenoid quenched
The solenoid quenched this afternoon at ~12:30. The compressor shut down. Fault lights were cold box trip. Restarted the compressor by 3:30 and started flow to the solenoid by 4:15. Peter Yandon came down with Ops' radio to investigate the radios may trip the solenoid. When the radio is keyed the vacuum guages jump. CG1, CG5 and the pirani gauges. This would trip of the refrigerator. More investigation to happen tomorrow and on maintenance day.
  256   Sun Aug 24 06:45:14 2008 Doug PreddyQuench Recoveryswitch to series mode
  260   Fri Sep 26 09:45:18 2008 Doug PreddyQuench RecoverySolenoid quenched at 7:50
Compressor on. Turbines started. Vacuum system recovering.
  261   Fri Sep 26 09:50:18 2008 Doug PreddyQuench Recoverystarted flow in parallel cold return mode
  263   Sun Oct 5 18:54:27 2008 Doug PreddyQuench RecoverySolenoid Quench ~16:30
Restarted compressor and flow to coldbox by 18:30
  267   Wed May 27 08:06:00 2009 Doug PreddyQuench RecoverySolenoid quenched at 5:00

The solenoid quenched at 5:00 this morning due to power lead temps. The temps started oscillating about 10 minutes before the trip. The compressor and the cold box stayed on. The flow to the solenoid was stopped.

The solenoid flow was started in parallel cold return at ~7:20.

  268   Wed May 27 13:37:22 2009 Doug PreddyQuench Recoveryswitch to series mode

Switched to series mode at ~11:00. Built liquid to 55% by 13:30. Started flow to the power leads.

  269   Wed May 27 15:01:34 2009 Doug PreddyQuench Recoverypower leads

Power leads are cold. There is still a small ripple. The power supply can be ramped up as soon as the ripples die out.

  270   Fri Jul 10 00:34:03 2009 Doug PreddyQuench Recoverysolewnoid quench due to power bump

Solenoid quench due to power bump caused by an airplane crash in Richmond at ~ 22:00. Compressor off. Water pump off. Restarted compressor at ~ 11:30. Cooling solenoid in parallel cold return mode by 12:15.

  271   Fri Jul 10 01:10:59 2009 Doug PreddyQuench Recoveryswitch to parallel warm return
  272   Tue Jul 14 15:28:36 2009 Doug PreddyQuench RecoverySolenoid ramped up

The solenoid is cold and I have started to ramp up the power supply. Some slight ripples in the power leads, but they are dieing out. Liquid level is a lot more stable this time.

  277   Fri Apr 9 07:34:55 2010 Doug PreddyQuench Recoveryswitched to parallel cold return

Switched to parallel cold return at about 7:30 this morning

 

  279   Mon May 3 07:49:54 2010 Doug PreddyQuench RecoverySolenoid quench Saturday

Solenoid quenched at ~13:30 Saturday. Kevin came in later in the day to recover it. System was in all around mode, no flow to solenoid. Discharge pressure went over 12 bar while starting flow and tripped the compresswor. After restart solenoid was cooling well.

Monday morning 7:30 I opened CV155 to increase the cooldown rate.

  280   Thu May 13 07:39:55 2010 Doug PreddyQuench Recoverysolenoid quench last night

Solenoid quenched on power lead temps last evening. I am recovering it in parallel cold return mode. C12~60K C1~50K.

  281   Thu May 13 14:37:13 2010 Doug PreddyQuench Recoveryswitching to series mode.
  283   Mon Jun 7 09:24:47 2010 Doug PreddyQuench Recoverystarted flow to power leads
  99   Thu Jun 9 06:53:40 2005 ExperimentorOtherTrip at 6:45 Today. 
Solenoid quenched at 6:45.  All temperature monitors were flat until trip.  
Hearing compressor stop was first warning.  Lights are:
Turbine T1 overspeed,  Compresor alarm, cryostat quench.

--Donald Arseneau
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