 Wed May 5 23:57:38 2004, Willy Andersson, Quench Recovery, Powerleads warming up again. 
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Got a page from Don Flemming at about 18:50 wondering why the power
lead temperatures were rising. See attachment may5_04_1800.BMP It looked as
though the monitoring signals flat lined for about 2 hours for some reason.
Anyway the powerlead temps were definitely rising. When I arrived HIC142
was wide open but both power lead flows were down to 65 (on the scale) and
the flowmeter float was vibrating rapidly. LHe heater at 33 %. Buffer
pressure at 10 psig. LIC108 at 54 %. CV147 at 0.45 (HIC141). CV141 at 0.6
TCI121 in auto mode.
Closed HIC142 then opened again. Powerlead temps dropped. Opened CV147
from 0.45 to 0.35 (HIC141) Played with setting of set point of TIC121 and
HIC141 to try to increase excess liquefaction. Reduced shield heat to about
16%. Difficult to say what is going on with powerleads. Temps had dropped to
good levels but now gradually rising, but very slowly. Hopefully they peak
and level off. Energized solenoid. Cycled HIC142 a few times but temps
would not trend downwards. Leaving it overnight. Doug, please check and
adjust the system as required in the morning. |
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Sun Nov 28 10:15:18 2004, Willy Andersson, Quench Recovery, Powerlead quench ?
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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. |
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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
work set system to // warm return mode to cool down transferlines. Lhe
level starts to boil away. Switch to // cold return mode. Discovered that
seem to get better cooldown rate by not opening supply valves to solenoid
fully. // cold return valves are fully open but both CV143 and CV146 are
only open to 0.55 giving mu1 and mu2 inlet pressures of 2 barA. Getting
good cool down rates and even building LHe level.
04:25 C1 down to 8K, C12 at 7.5K, C6 at 7.5K, 6KS_M at 10.5K |
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Thu Nov 4 13:33:49 2004, Doug Preddy, Normal Running, Power supply problems
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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. |
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Mon Apr 26 08:12:30 2004, Doug Preddy, Quench Recovery, Power leads flow
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Throttled back the LHe in until the power leads started to warm. My goal is
to flow "warm" gas (hopefully 80K) through the leads to drive any frozen
impurities out. |
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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
cycled hic142. This resulted in an immediate drop in temperature, an
increase of flow to 250 mm, and a slight drop in the LHe level. The temps
seem to be stable, with only a slight ripple. |
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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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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
right out.
Originally the ripple was 10.8-11.4K on the LHe-in and 8.9-9.2K on the PL-
Neg. They are now steady at 10.7K and 8.9K. |
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Thu Jul 5 03:04:50 2007, Doug Preddy, Normal Running, Power lead problems
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The power leads temps are starting to cycle again. Earlier today M9
experimentor cycled HIC142 to stablize the oscillations. They started
again early this morning, so cycled HIC142 again. Oscillations died back,
but are still present. Will try and warm the power leads later today when
the experiment's sample is changed. |
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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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Tue Jun 14 18:48:14 2005, Experimentor, Normal Running, Power bump at 18:40
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Solenoid tripped on a power bump at 18:40 Tuesday
-- Donald Arseneau |
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Mon Mar 5 14:59:41 2007, Doug Preddy, Maintenance, Password
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On the weekend someone used this log to send spam messages. I have
installed a password for the write privilege. Please contact me at 6399
for the password.
Doug |
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Tue Oct 2 13:02:37 2007, Doug Preddy, Normal Running, PLC problems
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While downloading new code for 2A PLC the M9 and M15 vacuum systems were
shut off. This is due to the two systems piggybacking onto the 2A PLC.
When M9 Epics came back up there was no controls. Eventually I reset the
local/remote switch (thumbwheel #100) to button #1 being on. Mike Leross
added a text and light on the epics vacuum page that says "EPICS works
only when green". If this light is not green, dial thumbwheel #100 and
push button #1. Make sure the light comes on and you should have EPICS
control back.
This caused a glitch in the refrigerator system. It did not trip it off,
but it would have if the solenoid was energised. The panel showed
compressor fault and the temps for TI121, and the powerleads all jumped.
This may be a cause for some of our unknown problems. |
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Tue Sep 25 07:34:04 2007, Doug Preddy, Start Up, PIC229 to 11 bar
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adjusted turbine speeds and HIC104 to maintain their values. |
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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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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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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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Mon Dec 3 14:59:58 2007, Doug Preddy, Quench Recovery, Not really a quench recovery, But...
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Not really a quench recovery, but...I wanted to send this out via e-mail.
The contactor for the compressor building fan failed recently. Randy is
looking after it, but parts will have to be ordered. The big door should
stay open until the fan is running again.
Other than the fan, the rest of the system weathered the weather okay.
It's up and running until Wednesday morning. After maintenance day, we
should ramp down the solenoid power supply and leave the refrigerator
running. We can do some training and maintenance at this time. I would
also like to keep it cold until blocks can be removed so we can pump out
the cold box. |
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Wed Sep 19 20:53:18 2007, Doug Preddy, Maintenance, More diff pump news
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Cold box pumped out to ~ 190 mTorr overnight.Leak checked the pump again.
Still leaks at dip stick.Tried resetting the o-ring on the dip stick. It
still leaks baddd!!!
Machined the old seal off and installed a smaller o-ring onto dip stick.
Installed 60 ml of new pump oil into pump. Pumping down again.
After 4 hours the cold box is down to 160 mTorr. |
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Wed Nov 24 07:28:30 2004, Other, , Mission Impossible
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