 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.
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Wed Nov 28 15:07:08 2007, Kevin Trithardt, Other, power lead regeneration
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| Power leads cold again, power supply ramping up. |
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Sun Jul 13 20:17:24 2008, Doug Preddy, Other, Helium refrigerator problems
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In early June the helium compressor was running with the solenoid cold. A vavlve broke off at the suction side of the compressor. The entire helium inventory
was lost. The cold box tripped off, but the compressor did not. It ran for ~ 2 hours before I came in and shut the system down. The valve was repairedby
Kevin T and Neil Wong. We ran hot (>100C) nitrogen through the fourth adsorber for one week. The solenoid and cold box were allowed to warm above 273C. |
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Thu Nov 11 15:46:40 2010, Doug Preddy, Other, switched to parallel cold return
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| At 14:45. |
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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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Fri Apr 23 09:19:30 2004, Doug Preddy, Normal Running, CV211
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PIC 229 was down to 10.8 bar this morning. PIC 229 was trying to open CV211
to charge the system. I realized that in restoring the control to CV211 I
did not get the wire into the connector properly. Went back up to the
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Tue Apr 27 09:03:18 2004, Doug Preddy, Normal Running, Power leads
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Power leads are being monitored with the strip tool graphs. I saw the temps
go from having a ripple to almost no ripple, but starting to increase in
temperature. I also noticed that the flow had dropped to 200 mm. I power
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Wed Apr 28 09:30:09 2004, Doug Preddy, Normal Running, power leads again
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Same story as yesterday. Ripples dieing out, flows down to <200 mm, temps
increasing. Turned HIC 142 down to 0.4 then back up to 0.75. Temps dropped
quickly. Then turned HIC 142 to 0 and back to 0.75. Temps dropping, flow >
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Tue May 4 11:20:57 2004, Doug Preddy, Normal Running, power leads going unstable
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power lead ripples increased over last couple of days. They are quickly
dieing out now and the temps are startint to increase. PL flow is down to
<180mm. I will power cycle HIC 142. |
Tue May 4 11:26:38 2004, Doug Preddy, Normal Running, power leads 
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Power cycled HIC 142 with solenoid power at 400 amps. Flows > 240mm and
temps have dropped. |
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Wed May 5 12:13:51 2004, Doug Preddy, Normal Running, power leads cold
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| should be ready to run. |
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Tue Jun 29 14:59:46 2004, Willy Andersson, Normal Running, Removed jumper on vacuum controller.
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Tuesday 14:55
Removed jumper on back of PIC 901. This jumper should be off during
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Tue Aug 24 12:09:50 2004, Doug Preddy, Normal Running, The past few days
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The solenoid has been re-started as of August 19. It was cooled down and
energized over the weekend. Sunday night at 9:30 it tripped due to
negative power lead going above it's set point. The system stopped flow to
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Wed Aug 25 07:47:05 2004, Doug Preddy, Normal Running, Power lead flow
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The power lead flows had dropped to 210 mm this morning. I increased HIC142
from 0.8 to 0.83. The flows are back to <250 mm and the temps are back to
LHe in-10.8, PL-Pos-11.1, PL-Neg-8.9 |
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Wed Aug 25 12:52:53 2004, Doug Preddy, Normal Running, power lead ripple
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Lhe ripple has started. 10.9-11.4K PL-Pos also has a smaller ripple. Both
flows down to 230mm. Cycled HIC 142 and the ripple disappeared.
Put TIC121 into auto mode. |
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Sun Aug 29 14:39:19 2004, Doug Preddy, Normal Running, Power lead ripple
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The LHe in and PL-neg temps have been building up a ripple over the last
few days. Curtis cycled HIC142 Friday evening at about 5:00. I just had
the Main control room operator (Peter) cycle them again. The ripples died
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Mon Oct 25 15:44:15 2004, Doug Preddy, Normal Running, Power lead temps starting to ripple
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Power lead temps starting to ripple at a 1.5min period. PL flows are
both>250 mm. |
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Tue Oct 26 09:45:24 2004, Doug Preddy, Normal Running, power leads warming
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Flow to power leads dropped to <80 mm. Cycled HIC142. Temps dropping, flows
>250. |
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Fri Oct 29 14:25:23 2004, Doug Preddy, Normal Running, power lead flows dropping
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| Flow is down to <190 mm. temps are starting to climb. Cycled HIC142 |
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Mon Nov 1 07:17:44 2004, Doug Preddy, Normal Running, power lead flow gone bad
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power temps as follows:
LHE_IN 23
PL_POS 36
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