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.

Curtis switched to series mode last night at 7:00.
Startedflow to power leads at 7:00 this morning.

Came down to check on system. CV211 was fully open, trying to charge the 
system. Ripples on LHe in and PL neg. CV141 fully closed. I closed CV147 to 
0.45 to try and move CV141 open. Checked the buffer tank pressure, it was 
almost at zero. Lowering the liquid level to 40%.

buffer tank pressure is up to 6.5 psi.

Ripples got worse overnight.LHe in 10.3-11.7, PL Neg 8.0-8.7. Flows <200mm.
cycled CV142. Flows 240mm. LHe in 10.3-11.3  PL Neg 7.9-8.1

I loked at the power lead temps this morning. LHe_in 10.4-12.0  PL-Neg 8.0-
9.0  PL-Pos 9.8-10.4. Flows down to 160mm. Called Ops and got Danica to 
cycle CV142. Ripples and flow improved on the second try.

The cold box was isolated and pumped out after it warmed up. It has been 
refilled with helium.
Turbine 2 speed indicator failed at some time during the last run. After 
the turbine inlet vavle was closed the turbine continued to read full 
speed. I am removing the controller to look at it. The main power has been 
turned of for this procedure.

The following relays have been replaced in the Sulzer control panel:
K341, K379, K132, K324A, K314, K125, K127, K133, K252, K227, K233, K238, 
K239, K245, K246.
These were the one that had indications of sever rusting inside the case.
There are five more spare relays in the gray cupboard.

The turbine 2 speed indicator control box STA 120 has been replaced with a 
newer style Jaquet controller. This is similar to the ones used in the 
ISAC helium liquifier. See attached photos for set up parameters. These 
were taken from the old controller, Sulzer documentation, and the ISAC 2 
controllers.

The solenoid was pumped out Monday and yesterday after the quads just 
downstream of the solenoid were put back in place. The quad just 
downstream of the solenoid was remove to replace two coils on it. 
The cold box vacuum had tripped off some time in the last little while. 
Started it pumping on Monday also. The compressor was started Tuesday 
afternoon and flow was started to the solenoid. The purifier was 
regenerated and put on line in it's total buffer tank flow mode. The cold 
box was pressurized and the turbines were briefly spun up to check the 
operation of the new turbine speed indicator. It seems to be working 
properly. 
Flow to the turbines was started this morning and all went well. The speed 
indicator works properly. 
M9BIG1 started ot 6.6 x 10-6 before flow was started. One hour later it 
reads 4.8 x 10-6

I recieved a call from ops at 22:00 tonight that the solenoid had alarmed. 
I came in and found a cold box fault, with the compressor tripped off. I 
was unable to restart the compressor. I cleared the cryostat quench and 
compressor trips. The system looked as though it was ready to start. I 
pushed the compressor "ON" button, but as soon as the main contactor 
closed, the compressor tripped again. After a few trys and a bit of 
searching, I tried resetting the compressor over-pressure switch. That 
allowed me to restart the compressor. Once the high pressure comes up I'll 
start flow to the turbines.

See attached file for a screen grab of temps.

This is a strip tool  plot of the cooldown

See screen grab

The compressor was restarted and the solenoid is cooling (sort of) in 
parallel cold return.

see bitmap for temps/pressures after presurrizing coldbox. Preparing to 
start flow to turbines, then will start flow to solenoid in parallel warm 
return.

The solenoid was found to be warm on Monday morning. M9Q3 had a bad water 
leak over the weekend. The water header serving Q3 was turned off and the 
leak confirmed. Q3 was isolated and the header was turned back on. My 
supposition is that while the main header was turned off, the diff. pump 
under the solenoid tripped. When I looked at it this morning the 
compressor was off and the vesssel vacuum was very bad. The PLC connection 
to EPICs is down, so I can not restart the vacuum system yet. Mike Leross 
is looking at the problem. 
There was no trip signal to the main control room. It looks as though the 
control room signal was bypassed downstairs. 
The power supply fault light was on on the QRL panel, but I okayed Bob 
Hilton locking out the power supply in order that Q3's water leak can be 
repired. Shutting of the main breaker may have turned on this light. The 
other possibility is that the power supply was not ramped down and shut 
off properly.

Recovered the vacuum in the solenoid, then started the compressor.
Started flow to solenoid in parallel warm return.