 Wed Nov 24 07:28:38 2004, Other, , Mission Impossible
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Tue Nov 7 10:35:32 2006, Doug Preddy, Normal Running, Maintenance day
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I ramped down the solenoid power suplly and shut off flow to the power
leads. I will allow them to warm up and (hopefully) recover the flow rates.
I am also regenerating the M9BCP@ cryopump. |
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Sun Oct 5 11:12:48 2008, Doug Preddy, Normal Running, M9B:V1 interlocks and a IOC crash
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| M9A:V1 was removed this shutdown. It's "in" limit is required to allow M9B:V1 to be opened. I have bypassed the interlocks on M9B:V1 until the M9A:V1 limits can be jumpered. Don Dale and George Clark have been informed.
Also an IOC crashed so the data pages were not updating. Evgeny rebooted the IOC. All is now fixed. |
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Sun Jul 1 16:09:37 2007, Doug Preddy, Normal Running, M9B:DP2 tripped off
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Diffusion pump tripped off and vacuum (and power lead temps) going up. I
had an experimentor cycle HIC 142 at 4:15 this morning. When I got in
today I restarted the pump and it is back to 6.0 x 10-7. Power lead temps
also are going down. |
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Wed Nov 2 10:17:27 2005, Willy Andersson, Start Up, M9B helium refrigerator and solenoid cooldown
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Started M9B MYCOM helium compressor circulating helium through system last
Friday. Right hand purifier was regenerated previously, LN2 fill system
started and flow started from buffer through purifier to low pressure
return line to compressor. Left in this mode over the weekend. Curtis came
in on weekend to add new full LN2 dewar to purifier.
Started // warm return cooling Monday.
Tuesday morning solenoid temps about 35 K and TI121 about 35 K so
switching to // cold cooling.
Note:
PDI 104 guage is very slugish to respond, needs to be replaced or cleaned.
TI148 and TI149 need to be recharged with helium, they do not work yet.
TIC121 may be reading too high a temperature, try to verify it with TE147
before JT effect begins. Now TI121=20.7 K TE147=25 K HIC155 is full
open still.
LIC108 is reading too high, reads 22% LHE but really is no LHE at this
point. |
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Fri Oct 1 11:39:55 2004, Doug Preddy, Maintenance, Loading of compressor not working
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When the compressor was restarted on Monday, the remote load button would
not respond. The compressor was shut off. After two days of searching the
wiring etc. a bad connection was found on DR1 relay (upstairs in the
compressor control panel). The wire was the "compressor on" sensor.
Connection was cleaned and retightened.
The compressor was started this morning and is working.
I pressurized the cold box and started flow to the solenoid and through the
power leads. I started a continuous flow throughthe LN2 adsorber. This will
be run over the weekend. Cooling to start Monday morning. |
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Fri Jun 16 08:12:04 2006, Doug Preddy, Normal Running, LI108 indicates high on EPICS screen
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LI108 indicates high on EPICS screen (150%) Controller shows ~64% |
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Tue Sep 9 15:04:23 2008, Doug Preddy, Maintenance, Jumpered interlock for diff pump water flow
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| Jumpered interlock for diff pump water flow in Proteus box. |
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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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Fri May 21 09:27:39 2004, Doug Preddy, Maintenance, Idle mode
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Power supply was ramped down yesterday as there are no users.
The Sundance server was rebooted yesterday. This morning the displays were
all white screened, so I restarted the session. The computer was running
very slow and I could not get the strip tool to run at all. I rebooted the
local PC and everything seems to be okay now.
While rebooting the computer had an error message that the hard drive may
have some bad sectors. Did a scan disk and it seems okay, but the hard
drive might be dying in the local machine. |
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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. The compressor, all piping, cold box, solenoid and buffer tank were pumped and purged with helium three times. Liquid helium was boiled off to pressurize the system to 10 psi and bottled gas was added to allow the compressor to start. We started the compressor and ran the gas through the purifier for three weeks. During the third week we added a second purifier. The purity was not measurable with the meter that we had. An RGA was set up to give some information on the rate of scrubbing. After three weeks the gas purity was better that 2 PPM. The system was cooled down. We added ~ 75 LL of heium via boil off to the system.
As the cooling progressed it was noted that the power supply for the 80K shield heater was burnt. An auto transformer was wired into the system and will be used until a replacement power supply can be purchased. |
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Mon Aug 9 14:27:12 2010, Doug Preddy, Shut Down, Helium plant shut down
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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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Fri Nov 3 12:09:51 2006, Doug Preddy, Normal Running, Fine tuning
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The power lead temperatures have been climbing at a rate of ~ 0.02K very 8
hours. The negative lead started to show some rippling this morning. The
positive flow had dropped from >250mm to 240mm. I cycled CV142 and the
temps dropped slightly. The negative ripple is gone and the positive flow
is back to >250mm. |
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Fri Dec 19 11:34:10 2003, Doug Preddy, Quench Recovery, Final home of this E-log
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http://isac.triumf.ca/m9sol/
Chris has set up the M9 solenoid e-log at the above web address. Play with
it and let me know if it breaks. |
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Fri Jul 21 23:36:21 2006, Doug Preddy, Quench Recovery, Final cooldown problems
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80K shield is down to <60K Liquid level not building. Power leads rippling
and warming. T1 inlet 85K with 10%heater load.
Lowered the set point of TI121 to 17K. Shut off flow to the 80K shield to
try and warm them. Turbine 1 inlet temp dropping (83K)
Power leads cooled and stablized, coil temps came down. Leaving it for 1/2
hour to evaluate. |
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Wed May 2 16:28:16 2007, Doug Preddy, Normal Running, Energizing solenoid to 500 amps
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Power supply initially would not ramp up. I exercised the rate control
selector switch and found that the power supply would ramp up at only the
30 minute setting. It is ramping up at a rate of about 60 minutes. |
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Sat Aug 7 23:40:47 2004, Willy Andersson, Quench Recovery, Energizing solenoid
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23:39 Powerleads cold, LHe level over 40% and rising. Energizing solenoid
to 500 Amps, ramp rate 60. Checking compressor building then going home. |
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Tue Oct 31 08:37:34 2006, Doug Preddy, Quench Recovery, Energizing solenoid
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Sun Jul 29 04:58:27 2007, Doug Preddy, Quench Recovery, Energizing solenoid
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LHe level~50%. Still have a slight ripple in the power leads, but they are
cold enough to power the solenoid. LHe_in varies between 10.7K - 11.3K. |