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.

The power lead flows had dropped to 210 mm this morning. I increased HIC142 
from 0.8 to 0.83. The flows are back to <250 mm and the temps are back to 
LHe in-10.8, PL-Pos-11.1, PL-Neg-8.9

The solenoid has been re-started as of August 19. It was cooled down and 
energized over the weekend. Sunday night at 9:30 it tripped due to 
negative power lead going above it's set point. The system stopped flow to 
the solenoid, but kept the compressor and cold box running. While starting 
flow to the solenoid, we got a high pressure trip. I came in and restarted 
the compressor, after Curtis located and reset the over pressure 
interlock. The solenoid is cold and energized as of 3:30 pm yesterday. It 
is still stable as of now.

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.

23:39 Powerleads cold, LHe level over 40% and rising. Energizing solenoid 
to 500 Amps, ramp rate 60. Checking compressor building then going home.

Got a call at about 10:00 this morning, the whole system had tripped off. 
No power bumps or other disturbances. When I arrived the only fault 
indications were "ColdBox Trip" light on the compressor panel and on the 
QRL panel the red "ColdBox" LED was ON. On the SULZER panel the 
yellow "Cryostat Quench" light was ON. On the First Trip logger #1 and #15 
LED's were ON. But no indication about what the actual fault was. Cooling 
water OK, compressed air OK, compressor ventilation OK. Outside ambient 
temperature was cooler than we had last week. BIG1 was off but when I 
turned it back on the vacuum looked good but was slowly rising as the 
solenoid warmed. I put the jumper on the vacuum controller. Prepared system 
for re-start.

Started compressor. Started flow thru coldbox. Raised discharge pressure.
Started turbine flow. Didn't get any freezing but it seemed that T1 speed 
wandered slowly +/-0.1k rev/sec when it got up to about 3.6k revs/sec, but 
this only lasted for a second or two. Not sure if I was just seeing things.
Got turbines up to speed and started // warm return flow. Solenoid had been 
running at 500 Amps and when it quenched and sat warming it had warmed to 
about 40 K. Switched it to //cold return too soon and solenoid started to 
warm slightly. Back to // warm return mode. Had to throttle flow thru 
solenoid with warm return valves to get effective cooling. If had return 
valves wide open TI121 would warm up too much. Discovered that if I 
throttle the flow out of the solenoid slightly then TI121 would fall and 
solenoid would start to cool. Less flow gave more cooling. Don't quite 
understand that one. Switched to // cold return mode when solenoid temps 
falling below 20K.

About 15:00 stable // cold return cooling. Going home for a while.

19:30 solenoid temps bottomed out at about 11K. Switch to series mode. 
Something strange about the first trip detect. I reset it once and when I 
checked it an hour or two later it showed a trip on #1 and #15 LED's even 
though nothing had happened. Something must be causing false indications.

20:15 series cooling, solenoid temps at about 6K, LHe level rising slowly 
at about 10%. Removed jumper on vacuum controller.

Changed to series mode.

cooling rates for the solenoid are good. In parallel cold return.

c1 28, c12 29, c6 11.6, c7 12.5 TI121 22.5

Two power bumps tonight. Everything tripped of. Restarted cooling water 
pump, diff. pump under solenoid etc. Computer stayed on! Starting 
compressor.

Switching to series mode. Jumper on vacuum gauge removed.

Solenoid temps were: C1 & C12 about 30K. C6 &C7 about 11K. Started flow to 
solenoid in parallel cold return. Jumpered out the vacuum gauge for the 
solenoid vacuum.

I was phoned at about 9:30 tonight with a solenoid alarm. After looking at 
the display I found the system to be tripped off. When I came in I found 
the compressor off and the solenoid quenched. There was no real indication 
of the problem other than a cold box fault. I restarted the compressor and 
started flow to the cold box.
Just a reminder: This elog is now at: https://elog.triumf.ca/M9sol

Tuesday 14:55

Removed jumper on back of PIC 901. This jumper should be off during
normal operation so the solenoid/refrigerator is protected from bad vacuum.

At about 14:00 solenoid temps dipping below 8 K. Trace of LHe level (dense 
gas) starting to show. Switching to series cooling mode.

At about 09:30 this morning I noticed the sound coming from the compressor 
building seemed louder than usual. After entering the building I noted that 
the compressor was unloaded to about 50% and the compressor suction was 
running at about 15 psig. Down at the SULZER panel the solenoid vacuum 
system was tripped off, the flow was still in series mode but no LHe level,
solenoid temps at over 40 K. Contacted Doug. Cannot figure out why the 
compressor was unloaded to 50 %. Solenoid had not tripped on bad vacuum 
because jumper was still on PIC901. Doug mentioned there was a power bump 
yesterday at about 15:00. May be when the vacuum system tripped but does 
not explain the compressor unloading.

Doug restarted vacuum system. I stopped flow to solenoid. Stabilized 
pressures. We checked the compressor to try to see what would cause the 
Unloaded state. Could not see any oil leaks. 

Back at Sulzer panel loaded compressor to 100 %. Stabilize pressures. STart
cooling flow to solenoid, // warm return. Adjusting turbine speeds and 
shield heat as required. Switched to // cold return flow after solenoid 
temps down to TIC 121 temp of about 20 K.

Power supply was ramped down yesterday as there are no users.
The Sundance server was rebooted yesterday. This morning the displays were 
all white screened, so I restarted the session. The computer was running 
very slow and I could not get the strip tool to run at all. I rebooted the 
local PC and everything seems to be okay now.
While rebooting the computer had an error message that the hard drive may 
have some bad sectors. Did a scan disk and it seems okay, but the hard 
drive might be dying in the local machine.

When performing last nights refrigerator adjustments I also increased the 
compressor discharge pressure to 11.25 barA. Also the backup air compressor 
was tripped off again and I reset it. Finally I opened the city water flow 
to the compressor water package chiller. PI110-1 reads 9.25 barA and PI120-1
reads just over 4 barA. Both power lead flowmeters pegged to top of scale.
Reset the "first trip" device that Don Dale had loaned us.

This morning the power leads had crept up slightly but still well below 
trip settings. Oscillations have not appeared yet. LHe vessel heater at 
about 14 to 15 %. Shield heat at about 16 %. Saved screen shots of 
m9_solenoid.dl and striptool windows to files may6_04_0900.BMP and 
may6_04_0905.BMP. TE106 is 81.6 Kelvin. Solenoid Current is stable at 404 
Amps. (DVM meter reads 20.2) Both power lead flowmeters still pegged to top 
of scale.

Closed HIC142 for 1 second then opened it wide open again to see effect on 
power lead flows. Other than the initial blip they just fall back to their 
previous value, no improvement. See file may6_04_0915.BMP. Adjusting 
turbine speeds slightly. Going to take a check in the compressor building 
then going on to other work.