System in good // warm return mode, temps coming down nicely. BCP2 cryopump 
does not look too healthy, temperature is just over 20K, very close to low 
set point.

TIC121 down to 120K, Mu1 return temp at 164K, Mu2 return at 273K, T1 inlet 
temp at 208K. Cooling looks good for overnight.

Main compressor tripped, refrigerator shutdown. Checked with experimentors 
and main control room, no indications of power bump etc.

Restarted compressor, // warm then // cold return. One of the MV5x valves 
frozen open, had to de-power valve  a couple of times to get it to seal.

Switched to series mode about 6 hours ago. Cooling continued including 
power leads until LHe level at about 50% and powerleads appeared stable.

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

Leaving system cooling in // cold return mode, cooldown rates still good. 
Had flow on to powerleads since re-starting cooling flow to solenoid.
Either I (when I return to work later this morning) or Doug will do the 
switch to series mode.

Powerlead temperatures have bottomed out, energizing solenoid to 300 
amps, ramp rate 60.