 Thu Oct 5 11:51:53 2006, Doug Preddy, Start Up, Adde 2 bottles UHP Helium
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Valved off purifiers, but left LN2 on. |
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Thu Oct 5 10:26:26 2006, Doug Preddy, Start Up, switched to parallel cold return
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Wed Oct 4 18:10:18 2006, Willy Andersson, Start Up, Quick check on system
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System in good // warm return mode, temps coming down nicely. BCP2 cryopump
does not look too healthy, temperature is just over 20K, very close to low
set point.
TIC121 down to 120K, Mu1 return temp at 164K, Mu2 return at 273K, T1 inlet
temp at 208K. Cooling looks good for overnight. |
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Wed Oct 4 07:29:04 2006, Doug Preddy, Start Up, Starting cool down
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Started compressor yesterday with flow through the purifier overnight.
Starting tubines this morning in parallel warm return |
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Thu Aug 17 19:45:27 2006, Willy Andersson, Quench Recovery, switch to series cooling
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Temps of flow returning from solenoid flat lined at about 10K.
Gradually closed CV155.
Then switched to series cooling. |
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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.
preparing to start flow to solenoid in // cold return. |
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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
at about 65% open. |
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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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Thu Aug 10 20:26:09 2006, Willy Andersson, Quench Recovery, solenoid energized
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Powerleads seem stable. |
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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 08:33:44 2006, Doug Preddy, Normal Running, Running low on helium
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Temperture okay, but there are fluctuation in the power leads. PIC229 is
trying to charge. The buffer tank pressure is just >0 psi. I will lower the
liquid level to 40% to allow some helium to boil off into the buffer tank. |
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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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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
began to fall. Asked Don to look at graph of temps later in the night and
if they fall down to a flat line to then reduce CV155 a bit to get the
temps trending further down.
This morning CR_C1_ENT has fallen to a slightly upward trending flat line
of about 12.7 K. Probably ready for switching to series mode by whoever
gets to the system first this morning. |
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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
opening of CV155, setting TIC121 to auto, even tapping TIC121. Finally
tried reducing flow to solenoid by reducing // warm return valves to about
70% open to see if possible to cool just refrigerator a bit.
TIC121 temp fell a bit and then inlet temperatures to solenoid began to
fall and solenoid slowly began to cool even though the mass flow to the
solenoid was reduced. Guess is that with solenoid homogeneusly at about 30K
there was not much resistance to flow so turbine massflow was starved just
enough to stall further cooling.
After temps were on a good downward trend Doug switched to //cold return.
At about 16:00 yesterday I reduced CV155 to about 70% and waited a bit to
confirm that temps were falling and then left the system to cool until
later that evening. |
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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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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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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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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 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
the magnet. Doug should be up now or soon, so I'll wait a little for you
to see this. If you do, call the m9 counting room 222-7379. After waiting
a while, I will just forge ahead. |
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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
try and warm them. Turbine 1 inlet temp dropping (83K)
Power leads cooled and stablized, coil temps came down. Leaving it for 1/2
hour to evaluate. |