 Fri Apr 16 10:15:26 2004, Doug Preddy, Start Up, Changes to M9sol Vacuum PC
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Yesterday and today there have been a number of changes made to the M9
Vacuum control computer. The computer now automatically boots up to the
Epics control page. This logbook is also automatically started. |
Mon Apr 19 15:06:49 2004, Doug Preddy, Start Up, Started turbines 
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Purifier run over the weekend. Both LN2 dewars empty, but purifier cold.
Disabled CV211 and flowed all charge gas through purifier. Started turbine
at 11:00am. set strip tool to monitor temps. Started M9BCP2. Pumped out
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Tue Apr 20 07:06:41 2004, Doug Preddy, Start Up, morning day 2
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| Temps in solenoid are equalling out. Increasing PIC229 to 11 bar. |
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Tue Apr 20 07:33:03 2004, Doug Preddy, Start Up, PIC229 at 11bar
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| PIC229 at 11 bar. Changed strip tool to 15 sec increments. |
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Wed Apr 21 06:39:17 2004, Doug Preddy, Start Up, over night
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Changed to parallel cold mode at 9:30.
At about 4:30 the city water chiller was turned on. The air compressor had
also tripped off. It was reset and restarted. |
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Wed Apr 21 06:48:31 2004, Doug Preddy, Start Up, JT bypass closed
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| Closed cv155 |
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Wed Apr 21 08:16:18 2004, Doug Preddy, Start Up, switch to series mode
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| Switched to series mode. |
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Wed Apr 21 09:57:59 2004, Willy Andersson, Start Up, System status
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Buffer tank pressure is down to about 6 psig. Too low to keep up
with liquefaction requirements to build LHe level. Doug Preddy
requested that I help Curtis Ballard top up system with new
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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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Mon Oct 4 09:16:29 2004, Doug Preddy, Start Up, Started turbines
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| Started flow to the turbimes with the solenoid in parallel warm return. |
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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 Oct 6 07:57:01 2004, Doug Preddy, Start Up, parallel cold return
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Switched to parallel cold return at 4:00 yesterday afternoon.
6:30 this morning started closing cv155 as temps had bottomed out at 24K. |
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Wed Oct 6 09:25:54 2004, Doug Preddy, Start Up, switch to series mode
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| switched to series mode |
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Thu Oct 7 13:33:20 2004, Doug Preddy, Start Up, turned off purifier
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| turned off purifier |
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Sun Oct 10 17:36:35 2004, Experimentor, Start Up, power leads
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At 5:30 pm sundat, power lead temp is about 10.6K. script tool still
notworking
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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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