 Fri Oct 5 13:25:41 2007, Doug Preddy, Quench Recovery, funny graph 
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There was a fluctuation of the positive lead temp with no flow going to
the power leads. |
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Fri Oct 5 10:25:43 2007, Doug Preddy, Quench Recovery, Unknown quench 2
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Kevin and I were at the Sulzer panel when the system quenched 2. No
obvious reasons. Restarted the system. |
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Tue Oct 2 13:02:37 2007, Doug Preddy, Normal Running, PLC problems
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While downloading new code for 2A PLC the M9 and M15 vacuum systems were
shut off. This is due to the two systems piggybacking onto the 2A PLC.
When M9 Epics came back up there was no controls. Eventually I reset the
local/remote switch (thumbwheel #100) to button #1 being on. Mike Leross
added a text and light on the epics vacuum page that says "EPICS works
only when green". If this light is not green, dial thumbwheel #100 and
push button #1. Make sure the light comes on and you should have EPICS
control back.
This caused a glitch in the refrigerator system. It did not trip it off,
but it would have if the solenoid was energised. The panel showed
compressor fault and the temps for TI121, and the powerleads all jumped.
This may be a cause for some of our unknown problems. |
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Thu Sep 27 07:41:15 2007, Doug Preddy, Start Up, Solenoid cold
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Solenoid cold and in series mode. 50% liquid level. Starting flow to
powerleads. |
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Wed Sep 26 08:52:46 2007, Doug Preddy, Start Up, switched to parallel cold return
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Tue Sep 25 07:34:04 2007, Doug Preddy, Start Up, PIC229 to 11 bar
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adjusted turbine speeds and HIC104 to maintain their values. |
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Mon Sep 24 15:08:41 2007, Doug Preddy, Start Up, Started cool down this morning
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The vacuum in the cold box was good on Friday 0.0 X 10-4. Let it pump over
the weekend. Added two bottles of UHP helium to system Friday.
Started the turbines this morning. Cooling in paralell warm return.
Solenoid vacuum is 3.9 x 10-6 |
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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. |
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Tue Sep 18 18:48:11 2007, Curtis Ballard, Maintenance, cold box leak check
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The leak check of the cold box diff pump fittings. Found a leak at the
base of the diff pump on the tee that is apparently used to fill the pump
with oil. The fitting was removed and a plug was removed that resembled a
dip stick (approx 1" long). Tbe dip stick was charred black as if it had
been hot. The seal between the dip stick and the tee was not an O-ring.
It looked like a high temperature glue? For leak checking purposes, an O-
ring was fitted to the dip stick and reinserted in situ. Only the top
portion of the tee was removed. The lower cap was slathered in vacuum
grease. Pumping back down was slow. After two hours the vacuum was down
to 2 torr. At 6:30 pm, the vacuum was 200 mtorr, so I turned on the
filament and tried again to leak check. I was able to get the throttle
valve open a little wider than previously, but we still had a big leak. I
checked at the tee and got a strong response, but I also checked at the
diff pump connections and also got a response, albeit much less. We may
have to blank off the entire diff pump to isolate the cold box so that we
can leak check the system. Dimo said he will be able to help tomorrow.
For now, I will leave the roughing pump on the cold box and isolte the
leak detector. See you tomorrow.
P.S. I left a voice mail re: welding at TITAN 8:30 am/blankets/work
permits/extractor. cb |
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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 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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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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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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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 Jul 31 07:53:57 2007, Kevin Trithardt, Normal Running, cycled power leads
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got a page for the power lead temp
came down and cycled the power leads.. did not seem to make a difference..
Kevin |
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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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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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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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Thu Jul 5 11:01:47 2007, Kevin Trithardt, Other, Current lead warm up
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Due to curent lead temperature occilation Doug recommended warming up the
current leads.
The leads were warmed up this morning then cooled back down. Power supply
is ramping up now.. 2 1/2 hours start to finish. |
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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. |