 Wed Oct 13 08:17:00 2004, Experimentor, Start Up, cycling 142 when temp hit 10.68
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I tried cycling the valve twice -- at about 11:30 and again around 1:00,
trying both the buttons and the dial -- but it has had no effect on
the temperatures (aside from the transient spikes). That might be
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 Sun Oct 17 04:26:29 2004, Other, Start Up, cycling 142 when temp hit 10.68
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> I tried cycling the valve twice -- at about 11:30 and again around 1:00,
> trying both the buttons and the dial -- but it has had no effect on
> the temperatures (aside from the transient spikes). That might be
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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..
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Mon Oct 11 03:56:14 2004, Experimentor, Start Up, cv142 valve
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noticed that the lead temp rose to 24K over the past 4 hours. had control
room personnle cycle the cv142 valve. temperature dropped.
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Mon Oct 11 11:49:34 2004, Experimentor, Start Up, cv142 valve
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noticed temp rise, which occured only about 5 hours after the
last "reset" .... the time between resets seems to be decreasing, which is
not a good sign.
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Mon Oct 11 22:32:11 2004, Experimentor, Start Up, cv142 valve
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temp of leads begins its exponential rise again (caught it at 12K), approx
11 hours after last reset. this time asked operator to shut off valve for
3 seconds, then turn back on.
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Tue Oct 12 02:05:31 2004, Experimentor, Start Up, cv142 valve
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after only two hours since last lead cycling, they warm up quickly.
ops cycles the valve, but more quickly this time, off ... 1 sec ... on.
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Tue Oct 12 13:00:08 2004, Curtis Ballard, Start Up, cv142 valve
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Curtis closes and opens slowly at about 11:00 am this morning. Wants to see
if that works better than the sudden on/off switch.
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Sun Oct 15 07:09:41 2006, Other, Normal Running, cryopump bcp2 trip
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Donald Arseneau reporting
Not really solenoid realated, but FYI...
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Thu Jun 2 09:16:40 2005, Doug Preddy, Quench Recovery, continuing to cool 
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| See screen grab |
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Mon Sep 13 13:56:06 2004, Doug Preddy, Shut Down, compressor off
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| compressor off |
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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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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
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Fri Jul 25 21:48:15 2008, Doug Preddy, Quench Recovery, another quench
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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??) |
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Thu Aug 19 10:28:32 2004, Doug Preddy, Start Up, after M9bv5 FIX
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Over the last couple of days we replaced the gate on the M9BV5 valve. The
old one had worn the teflon sliders on the sides. Metal shavings on bottom
of body. Found a replacement with metal rollers, rather than slides.
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Tue Oct 5 07:18:16 2004, Doug Preddy, Start Up, adjust compressor discharge pressure
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| adjusted compressor discharge pressure to 11 Bar |
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Wed Dec 1 12:55:56 2004, Doug Preddy, Normal Running, added one bottle helium gas
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| buffer tank pressure is up to 6.5 psi. |
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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 Apr 22 10:39:16 2004, Doug Preddy, Normal Running, Yesterday
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Added two bottles of UHP helium to buffer tank.
Had no liquifation rate, so optimized Ti121 and HIC141 . Finally put TIC121
into manual mode at 0.65. Power lead fluctuation died out and liquid
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