Yesterday and today there have been a number of changes made to the M9 
Vacuum control computer. The computer now automatically boots up to the 
Epics control page. This logbook is also automatically started.

Purifier run over the weekend. Both LN2 dewars empty, but purifier cold. 
Disabled CV211 and flowed all charge gas through purifier. Started turbine 
at 11:00am. set strip tool to monitor temps. Started M9BCP2. Pumped out 
beamline between BV% and BV7. Opened BV6.

Temps in solenoid are equalling out. Increasing PIC229 to 11 bar. 

PIC229 at 11 bar. Changed strip tool to 15 sec increments.

Changed to parallel cold mode at 9:30.
At about 4:30 the city water chiller was turned on. The air compressor had 
also tripped off. It was reset and restarted.

Closed cv155

Switched to series mode.

Buffer tank pressure is down to about 6 psig. Too low to keep up
with liquefaction requirements to build LHe level. Doug Preddy
requested that I help Curtis Ballard top up system with new
bottle of UHP helium Through purifier. As of 09:45 not yet able 
to find Curtis.

PI229 discharge pressure dropped slightly to 10.45 barA. Set point
is 11 barA. Turbine speeds OK. CV211 is wide open. Energized HIC142
and set to 0.7 to start flow to powerleads. Up in compressor room
checked purifier. LN2 system running OK. In purifier package flowmeter
looks like oil or brownish spots on inside of rotameter glass. Possible
migration of trapped contaminants after correcting flow arrangement
through purifier. Initially buffer tank circulation flow entered
through AV3 but was corrected to enter through AV5.

Have 10:00 meeting, system seems stable and should be OK until I can
contact Curtis to top up system with UHP helium through purifier.

Over the last couple of days we replaced the gate on the M9BV5 valve. The 
old one had worn the teflon sliders on the sides. Metal shavings on bottom 
of body. Found a replacement with metal rollers, rather than slides. 
Pumped out downstream of gate valve. It's down to 5E-7 (moved the cable on 
the ion gauge so it now reads.)
Started cooling down the solenoid. Charging through the adsorber. LN2 fill 
piping broke. Repaired by resoldering. 
Ion gauge on solenoid seems to have burnt out last night.

Started flow to the turbimes with the solenoid in parallel warm return.

adjusted compressor discharge pressure to 11 Bar

Switched to parallel cold return at 4:00 yesterday afternoon.
6:30 this morning started closing cv155 as temps had bottomed out at 24K.

switched to series mode

turned off purifier

At 5:30 pm sundat, power lead temp is about 10.6K.  script tool still 
notworking

syd kreitzman

noticed that the lead temp rose to 24K over the past 4 hours. had control 
room personnle cycle the cv142 valve. temperature dropped.

srk

noticed temp rise, which occured only about 5 hours after the 
last "reset" .... the time between resets seems to be decreasing, which is 
not a good sign. 

had the controll room guys reset the cv142 valve (i.e. cycle it off/on)

syd

temp of leads begins its exponential rise again (caught it at 12K), approx 
11 hours after last reset.  this time asked operator to shut off valve for 
3 seconds, then turn back on. 

previous recycle, asked operator to shut off valve for two seconds ... and 
the warm up time was 11 hours.

previous^2 recyle, asked operator to shut off valve for 1 second ... and 
the warm up time was only 4 hours. 

Syd

after only two hours since last lead cycling, they warm up quickly. 
ops cycles the valve, but more quickly this time, off ... 1 sec ... on. 

syd

Curtis closes and opens slowly at about 11:00 am this morning. Wants to see 
if that works better than the sudden on/off switch. 

reported by srk