 Wed May 30 08:38:38 2007, Doug Preddy, Quench Recovery, Solenoid quenched this morning
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Solenoid quenched this morning on power lead temp (I believe).
I restarted it at ~7:00, but the capacity control for the compressor would
not respond. I shut the system back down and checked as many relays as I
could. I then restarted the system and it is now cooling. I will go
through the wiring diagrams and see if I can locate the bad relay. |
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Wed May 30 11:27:32 2007, Doug Preddy, Quench Recovery, Problems recovering
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Various start up problems :
MV51 stuck open. Finally got it closed by hitting the valve with a hammer.
Vacuum is bad in cold box as MV902 tripped closed.
Vacuum in solenoid has gone bad. Suspect boil off from inside solenoid. So
far it is not recovering.
Previously T1 would not spin up - frozen. |
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Thu May 31 07:11:05 2007, Doug Preddy, Quench Recovery, switched to parallel cold return
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switched to parallel cold return earlier this morning. Vacuum is 5 x 10-5. |
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Thu May 31 11:51:49 2007, Doug Preddy, Quench Recovery, Switched to series mode
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Tue Jun 12 12:48:25 2007, Doug Preddy, Maintenance, added one bottle UHP helium to system
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Thu Jun 14 00:10:10 2007, Doug Preddy, Quench Recovery, recovering from earlier quench
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Solenoid quenched on power lead temperature last night at about 6:00. I
restarted flow to the solenoid in parallel cold return. Switched to series
mode and am building liquid. |
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Sat Jun 16 15:05:03 2007, Doug Preddy, Normal Running, Solenoid power lead temp problem
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Power lead temps rippling and increasing. I asked an operator to cycle
HIC142. This seems to have fixed the problem (for now). |
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Tue Jun 19 21:15:41 2007, Doug Preddy, Quench Recovery, Today's quench
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power lead temps caused a quench at 8:30 this morning. Recovery of system
and flow to solenoid was started by 11:00. Solenoid was switched to series
cold at 3:00. Solenoid and power leads were cold at ~6:30. power supply
was to be energized by experimenters. |
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Sun Jul 1 16:09:37 2007, Doug Preddy, Normal Running, M9B:DP2 tripped off
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Diffusion pump tripped off and vacuum (and power lead temps) going up. I
had an experimentor cycle HIC 142 at 4:15 this morning. When I got in
today I restarted the pump and it is back to 6.0 x 10-7. Power lead temps
also are going down. |
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Wed Jul 4 11:13:12 2007, Doug Preddy, Quench Recovery, test
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This is a test to make sure the e-mail works. |
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Thu Jul 5 03:04:50 2007, Doug Preddy, Normal Running, Power lead problems
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The power leads temps are starting to cycle again. Earlier today M9
experimentor cycled HIC142 to stablize the oscillations. They started
again early this morning, so cycled HIC142 again. Oscillations died back,
but are still present. Will try and warm the power leads later today when
the experiment's sample is changed. |
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Sat Jul 28 15:45:17 2007, Doug Preddy, Quench Recovery, quench recovery
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The solenoid tripped off this morning due to pwer lead over temp. The
compressor was also off. I restarted this morning at about 8:15 in
parallel cold return. Switching to series mode at 3:40. |
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Sat Jul 28 22:30:13 2007, Doug Preddy, Quench Recovery, quench again
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recovered system and energized solenoid at about 6:00 this evening.
At 9:30 power lead temps quenched solenoid again. MV52 stuck open during
start-up. |
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Sun Jul 29 04:58:27 2007, Doug Preddy, Quench Recovery, Energizing solenoid
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LHe level~50%. Still have a slight ripple in the power leads, but they are
cold enough to power the solenoid. LHe_in varies between 10.7K - 11.3K. |
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Mon Aug 6 08:41:31 2007, Doug Preddy, Quench Recovery, Cold box trip at 6:00
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compressor off due to cold box trip at 6:00 this morning. Restarted system
and started flow to solenoid in parallel cold return. |
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Tue Aug 14 10:15:22 2007, Doug Preddy, Maintenance, Solenoid ramped down
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Solenoid ramped down and locked out for M9A slits work. |
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Tue Aug 14 12:55:12 2007, Doug Preddy, Normal Running, Strip tool saves
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There are two strip tools saved:
coils
powerlead |
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Wed Sep 12 12:01:02 2007, Doug Preddy, Maintenance, regenerated adsorber
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regenerated adsorber
replaced MV902 "ON" switch (used nitrogen precooling on switch) |
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Fri Sep 14 12:44:52 2007, Doug Preddy, Start Up, started compressor
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running purifier over weekend |
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Wed Sep 19 20:53:18 2007, Doug Preddy, Maintenance, More diff pump news
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Cold box pumped out to ~ 190 mTorr overnight.Leak checked the pump again.
Still leaks at dip stick.Tried resetting the o-ring on the dip stick. It
still leaks baddd!!!
Machined the old seal off and installed a smaller o-ring onto dip stick.
Installed 60 ml of new pump oil into pump. Pumping down again.
After 4 hours the cold box is down to 160 mTorr. |