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.

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.

Solenoid tripped on a power bump at 18:40 Tuesday
-- Donald Arseneau

No experiment running in M9B.

Solenoid current is zero and power supply not armed.

System in stable series cooling mode.

Saturday November 12 the solenoid power supply ramped itself down to zero. 
It would not ramp up unless the ramp rate was set to 30 minutes. At this 
setting the power supply ramped up to the required current. It seems to 
ramp slower than the 30 minute rate. Klaus also looked at the problem. His 
suggestion is to exercise/clean the switches and pots.

power leads warming. closed HIC 142, then re-opened. temps falling

LI108 indicates high on EPICS screen (150%)  Controller shows ~64%

I would have made an entry when it died, but-----

Tuesday night. June 27, 2006, the solenoid quenched for no apparent 
reason. It was restarted Wednesday morning. The vacuum in the solenoid 
went away (up to 8 Torr). This was found to be a result of a leaking 
isolation valve between the solenoid and T2. T2 was vented, which caused 
the solenoid to slowly vet. When T2 was pumped out again, the solenoid 
vacuum recovered. This caused a delay in recovering the solenoid. As of 
Friday morning 7:15 the solenoid power supply was ramped up.

test

Temperture okay, but there are fluctuation in the power leads. PIC229 is 
trying to charge. The buffer tank pressure is just >0 psi. I will lower the 
liquid level to 40% to allow some helium to boil off into the buffer tank.

Donald Arseneau reporting

Not really solenoid realated, but FYI...
The cryopump bcp2 stopped working and the vacuum valves tripped.
When I came in, the CP was over 200K and the pressure (bcg4) read
over 200 torr, with the CP nominally on.  I switched it off and
continued warming; pumped it out; and am now re-cooling.  It seems
to be normal so far.

-D

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. 

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.

Solenoid cold, power leads cold. Alarm handler started.

The PLC Limit switch power supply was tripped off on Saturday. I came in 
and reset it and restarted all the vacuum systems that had tripped off. 
The power leads were found to be warming up. This morning they were at ~ 
45K. I stopped flow to the power leads and will allow them to warm up 
above 80K and then will recool them.