Power leads have flatlined but still building LHe level.

Coils temps <10K.Switching to series mode.

Raised PIC229 to 11Bar. Started to close HIC155. Cooling rates improve.

Even though cr_c1 and cr_c12 have begun to tick down, cr_c7 and cr_c6 are 
actually ticking up. This is probably a wave of warming propagating through 
the solenoid. As long as the two inlets are falling in temperature then 
things are going in the right direction. Once the warm wave travels through 
the outlets will begin to cool as well.

cr_c1 and cr_12 are both at about 45K and heading slowly down, so the 
gamble of going to // cold return worked. Maximum opening of CV155 is 
limited by CV204 goes fully closed and suction pressure begins to rise 
above set point. Adjust cv155 to keep cv204 just at the closed point. Keep 
tweaking cv155 and turbine speeds as things get cooler.

TIC121 was down to 27K
warm return valves were wide open
opened supply valves CV143 and CV146.
TIC121 went up to about 37K
Mu1 return temperature went down to about same temp as TIC121 so set Mu1 to 
cold return. Open CV145 then close CV151. Mu2 return was still > TIC121 so 
kept it in warm return mode. Adjust turbines as required.
After about 20 minutes Mu2 return temp dropped down to about equal to Mu1 
return temp of about 38K. Then set Mu2 to cold return. Open CV147 then 
close CV143. TIC 121 drops to 30 K. Even though Mu1 and Mu2 return temps 
greater than TIC121 I will keep it in //cold return mode to see if the core 
solenoid temperatures will start to fall. To maximize the use of the 
cooling from T2 outlet temperature CV155 is tweaked open to its maximum 
stable opening. This helps cool the lower heat exchangers. If this works 
then cr_c1 and cr_c12 should start to tick downwards. If they keep rising 
then have to switch back to //warm return.

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.

Started flow to turbines. Both started. T1 seems a bit slow. HIC110 at 0.85 
SI110 = 4100.
Cool down started.

I will leave the cold box to warm overnight and try it again in the morning.

T1 will not spin up. Warming up cold box.

Solenoid Quenched on C1 temp. It went above 5K. Shut off compressor. 
Restarting system @ 12:15

test

power lead warming/ripples caused quench at 18:45 today. Compressor stayed 
on, but flow to solenoid stopped.
I started flow to solenoid at 22:40.

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.

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

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

Powerleads appear stable.

Had system in //return cooling overnight with small flow to keep power 
leads cool. Switched to series mode about 30 minutes ago. Building LHe 
level.