On the weekend someone used this log to send spam messages. I have 
installed a password for the write privilege. Please contact me at 6399 
for the password.
Doug

I have installed a new control computer at the M9 solenoid control panel

The power has been out for about 24 hours. Recovering coldbox, solenoid and 
beamline vacuum.PLC is down for the vacuum system. Started compressor and 
am flowing warm helium through the soleniod to warm it up while the vacuum 
recovers.

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

Compressor tripped this morning at ~8:45. I restarted the compressor, but 
turbine 1 would not spin up. I let it warm for an hour and it started. I 
started flow to the solenoind in parallel cold return.

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.

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. 

Compressor still on. Starting flow to solenoid

solenoid tripped on power lead temp. I was here and caught it. System 
cooling.

power leads cold 50% liquid.
Turning on power supply

Switched to series mode at about 7:45.

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.

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

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

Hi there,

This is Khashayar (experimenter). Lookin at all different temperatures and 
levelson the monitor, it seems everything is stable now. I wonder if you 
could let us know what time we can have beam again? Would you please send an 
email to kghandi@mta.ca if you know the answer? You can also reach me at my 
cell# (506)961-0802 any time.

Thanks

Khashayar

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

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

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.