s

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

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

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

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

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

srk

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

syd kreitzman

At 10:30 PM Saturday, Donald Arseneau sees power leads at
25K, having gone up for the previous 10 hours.  (I didn't
see it earlier because striptool wasn't scrolling).  Cycled
valve 142.
--  Donald Arseneau

turned off purifier

switched to series mode

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

adjusted compressor discharge pressure to 11 Bar

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

When the compressor was restarted on Monday, the remote load button would 
not respond. The compressor was shut off. After two days of searching the 
wiring etc. a bad connection was found on DR1 relay (upstairs in the 
compressor control panel). The wire was the "compressor on" sensor. 
Connection was cleaned and retightened.
The compressor was started this morning and is working. 
I pressurized the cold box and started flow to the solenoid and through the 
power leads. I started a continuous flow throughthe LN2 adsorber. This will 
be run over the weekend. Cooling to start Monday morning.

compressor off

The solenoid quenched on powerlead temps this morning at 10:00. It is 
warming up and the power leads are >200K.Isolating and purging the coldbox 
is not very useful now, so I am shutting the system down.

started flow to the power leads at 11:30. Cold and stable at 1:00am. 
Energized solenoid at 1:30.

Solenoid had tripped on powerlead overtemp at about 09:00 this morning. 
Doug recovered the system to // cooling. I switched system to series 
cooling at about 21:30. LHe level at about 10%. Buffer tank pressure is low 
at about 13 psig. Letting LHe level build. Once LHe level rises to about 
35% then I suggest starting flow to the powerleads by opening HIC142 fully 
open. LHe level should continue to build but at a much slower rate. Once 
power lead temps have bottomed out to cr_pl_neg < 9K and cr_pl_pos < 11 K 
(check these values with archived data first) and are stable then can 
energize solenoid.

The LHe in and PL-neg temps have been building up a ripple over the last 
few days. Curtis cycled HIC142 Friday evening at about 5:00. I just had 
the Main control room operator (Peter) cycle them again. The ripples died 
right out. 
Originally the ripple was 10.8-11.4K on the LHe-in and 8.9-9.2K on the PL-
Neg. They are now steady at 10.7K and 8.9K.

Lhe ripple has started. 10.9-11.4K PL-Pos also has a smaller ripple. Both 
flows down to 230mm. Cycled HIC 142 and the ripple disappeared. 
Put TIC121 into auto mode.