ID |
Date |
Author |
Operational Mode |
Subject |
|
86
|
Sun Nov 28 10:15:18 2004 |
Willy Andersson | Quench Recovery | Powerlead quench ? |
Got page very early this morning. Couldn't come in til 08:30. System was
in idle running mode and someone had reset the QRL panel so my guess is
that the solenoid tripped on powerlead overtemp. HIC142 was not fully open
and I suspect this is why powerleads heated up. Now in // cold return mode.
Solenoid temps down to 25K and slowly going down. Have HIC142 slightly open
to keep powerleads cool. Strongly recommend that when running HIC142 should
be fully open to try to reduce the probability of powerlead warmup. |
|
85
|
Thu Nov 25 07:21:37 2004 |
Doug Preddy | Quench Recovery | started power lead flow |
Curtis switched to series mode last night at 7:00.
Startedflow to power leads at 7:00 this morning. |
|
84
|
Wed Nov 24 14:58:42 2004 |
Doug Preddy | Quench Recovery | today |
Came in this morning to find the helium return line to the buffer tank
frosted up. MV51 has been stuck open the whole time. That exlains the
cooldown rate and other problem. Cycled MV51 a few times and it now seems
closed. Switched back to parallel cold return this moring at 8:00. Rates
are much better. The E-log was also down this morning. |
|
83
|
Wed Nov 24 07:28:38 2004 |
Other | | Mission Impossible |
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|
82
|
Wed Nov 24 07:28:30 2004 |
Other | | Mission Impossible |
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|
81
|
Tue Nov 23 15:10:06 2004 |
Doug Preddy | Quench Recovery | switched to parallel cold return mode |
|
|
80
|
Tue Nov 23 11:35:44 2004 |
Doug Preddy | Quench Recovery | Another power bump |
Compressor tripped off again due to a power bump. Meson hall water off, so
vacuum pumps off again.
Pumps back on , vacuum pumps on, starting compressor. |
|
79
|
Tue Nov 23 09:30:15 2004 |
Doug Preddy | Quench Recovery | started flow to solenoid |
Started flow to solenoid in parallel warm return. |
|
78
|
Tue Nov 23 07:47:00 2004 |
Doug Preddy | Quench Recovery | Solenoid quench Nov 21 |
Solenoid quenched Nov 21 due to alarge power bump. Everything tripped off
including vacuum and water pumps. Cold box vacuum was at 3.6e-1, so pumped
it out overnight.
Started compressor at 7:20. Started turbines at 7:40. |
|
77
|
Thu Nov 4 13:33:49 2004 |
Doug Preddy | Normal Running | Power supply problems |
Last night the power supply was ramping up at a very slow rate. This
morning it was energized,but with no current even though the limit was set
to 500 amps. Klaus R. found the pot. that set the current limit was bad.
Repaired it. First try at ramping caused a voltage imbalance and a quench
I. After a quick recovery, the second try was successfull. Solenoid ramping
to 500 amps at a good rate. |
|
76
|
Mon Nov 1 07:17:44 2004 |
Doug Preddy | Normal Running | power lead flow gone bad |
power temps as follows:
LHE_IN 23
PL_POS 36
PL_NEG 31
Flow <90mm
cycled HIC 142 off and on in 1/2 hour. |
|
75
|
Fri Oct 29 14:25:23 2004 |
Doug Preddy | Normal Running | power lead flows dropping |
Flow is down to <190 mm. temps are starting to climb. Cycled HIC142 |
|
74
|
Tue Oct 26 09:45:24 2004 |
Doug Preddy | Normal Running | power leads warming |
Flow to power leads dropped to <80 mm. Cycled HIC142. Temps dropping, flows
>250. |
|
73
|
Mon Oct 25 15:44:15 2004 |
Doug Preddy | Normal Running | Power lead temps starting to ripple |
Power lead temps starting to ripple at a 1.5min period. PL flows are
both>250 mm. |
|
72
|
Fri Oct 22 09:15:06 2004 |
Doug Preddy | Start Up | started flow to power leads |
Started flow to power leads HIC142 at 0.8. |
|
71
|
Thu Oct 21 15:41:29 2004 |
Doug Preddy | Start Up | switched to series mode |
|
|
70
|
Thu Oct 21 07:16:35 2004 |
Doug Preddy | Start Up | switched to parallel cold return |
|
|
69
|
Wed Oct 20 09:38:17 2004 |
Doug Preddy | Start Up | restarting system |
Solenoid tripped off Monday morning due to high compressor pressure.
Regenerated purifier on Tuesday. Started compressor at 9:00 this morning. |
|
68
|
Sun Oct 17 05:03:13 2004 |
Other | Start Up | Cycle valve after oscillations begin |
(Sat night/Sun AM) Helium temperature started oscillating, so
powered off magnet (precautionary) and cycled valve 142 (at 04:12).
Small oscillations begin almost immediately, so close and open
the twist-knob for 142. Works better. |
|
67
|
Sun Oct 17 04:26:29 2004 |
Other | Start Up | cycling 142 when temp hit 10.68 |
> 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
> bad. We will have to see if it altered the trend.
>
> --
> Donald Arseneau
It did -- temperatures held stable for several days |