 Wed Jun 14 10:35:30 2006, Willy Andersson, Quench Recovery, Switched to series cooling.
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Had system in //return cooling overnight with small flow to keep power
leads cool. Switched to series mode about 30 minutes ago. Building LHe
level. |
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Wed Jun 14 16:27:01 2006, Willy Andersson, Quench Recovery, Energized solenoid
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| Powerleads appear stable. |
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Thu Jul 20 11:01:09 2006, Willy Andersson, Quench Recovery, Opened up warm return valves CV151 and CV153
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Mu2 pressure was just about at trip point due to trapped volume of helium
warming. So opened up warm returns to bleed off pressure and prevent it
from rising. |
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Thu Jul 20 13:21:57 2006, Willy Andersson, Quench Recovery, started // warm return flow.
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TIC121 was down to 27K
warm return valves were wide open
opened supply valves CV143 and CV146.
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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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Fri Jul 21 17:18:19 2006, Willy Andersson, Quench Recovery, Opened HIC142 fully open
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| Power leads have flatlined but still building LHe level. |
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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
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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
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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 20:26:09 2006, Willy Andersson, Quench Recovery, solenoid energized
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| Powerleads seem stable. |
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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
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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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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.
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Thu Oct 12 11:53:04 2006, Willy Andersson, Quench Recovery, Compressor trip, 09:50 this morning.
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Main compressor tripped, refrigerator shutdown. Checked with experimentors
and main control room, no indications of power bump etc.
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Thu Oct 12 19:54:10 2006, Willy Andersson, Quench Recovery, Energized solenoid.
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Switched to series mode about 6 hours ago. Cooling continued including
power leads until LHe level at about 50% and powerleads appeared stable. |
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Thu Oct 26 04:27:31 2006, Willy Andersson, Quench Recovery, Powerlead overtemp
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02:30 this morning got page from operations.
Looked at system online, appears that there was a powerlead overtemp
that caused the quench. Compressor still running. After arriving to
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Thu Oct 26 04:34:15 2006, Willy Andersson, Quench Recovery, Still in // cold return mode.
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Leaving system cooling in // cold return mode, cooldown rates still good.
Had flow on to powerleads since re-starting cooling flow to solenoid.
Either I (when I return to work later this morning) or Doug will do the
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Wed Nov 15 17:05:49 2006, Willy Andersson, Quench Recovery, powerleads cold, energizing solenoid
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Powerlead temperatures have bottomed out, energizing solenoid to 300
amps, ramp rate 60. |
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Sat Oct 9 22:50:26 2004, Other, , power leads warmed
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At 10:30 PM Saturday, Donald Arseneau sees power leads at
25K, having gone up for the previous 10 hours. (I didn't
see it earlier because striptool wasn't scrolling). Cycled
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