Got a page from Don Flemming at about 18:50 wondering why the power
lead temperatures were rising. See attachment may5_04_1800.BMP It looked as
though the monitoring signals flat lined for about 2 hours for some reason.
Anyway the powerlead temps were definitely rising. When I arrived HIC142
was wide open but both power lead flows were down to 65 (on the scale) and
the flowmeter float was vibrating rapidly. LHe heater at 33 %. Buffer 
pressure at 10 psig. LIC108 at 54 %. CV147 at 0.45 (HIC141). CV141 at 0.6
TCI121 in auto mode.

Closed HIC142 then opened again. Powerlead temps dropped. Opened CV147
from 0.45 to 0.35 (HIC141) Played with setting of set point of TIC121 and
HIC141 to try to increase excess liquefaction. Reduced shield heat to about 
16%. Difficult to say what is going on with powerleads. Temps had dropped to
good levels but now gradually rising, but very slowly. Hopefully they peak 
and level off. Energized solenoid. Cycled HIC142 a few times but temps
would not trend downwards. Leaving it overnight. Doug, please check and 
adjust the system as required in the morning.

should be ready to run.

Started flow to power leads.
TIC121 into auto mode

Solenoid quenched on power lead temp. I ran down and managed to recover it 
with minimal temp rise in the solenoid. Coil temps are falling, liquid is 
building. No flow to the power leads yet.

Power cycled HIC 142 with solenoid power at 400 amps. Flows > 240mm and 
temps have dropped.

power lead ripples increased over last couple of days. They are quickly 
dieing out now and the temps are startint to increase. PL flow is down to 
<180mm. I will power cycle HIC 142.

Solenoid quenched due to power leads at 9:00 tonight. Restarted flow in 
parallel warm mode. 

Same story as yesterday. Ripples dieing out, flows down to <200 mm, temps 
increasing. Turned HIC 142 down to 0.4 then back up to 0.75. Temps dropped 
quickly. Then turned HIC 142 to 0 and back to 0.75. Temps dropping, flow > 
250mm. Did not let negtive lead >10K, so would not have caused a trip.

TIC 121 into auto mode. 

Power leads are being monitored with the strip tool graphs. I saw the temps 
go from having a ripple to almost no ripple, but starting to increase in 
temperature. I also noticed that the flow had dropped to 200 mm. I power 
cycled hic142. This resulted in an immediate drop in temperature, an 
increase of flow to 250 mm, and a slight drop in the LHe level. The temps 
seem to be stable, with only a slight ripple.

Throttled back the LHe in until the power leads started to warm. My goal is 
to flow "warm" gas (hopefully 80K) through the leads to drive any frozen 
impurities out.

Switching over to series mode.

Got pager call at 16:20 this afternoon. Solenoid had tripped on PL 
temperature. Arrived at about 17:00. Did a print screen of the striptool 
graph and solenoid screen. See files Prtscrn1_april25_2004.doc and
Prtscrn2_april25_2004.doc. System was in idle running mode. LHE heater at 
about 30%, buffer tank press at21.5 psig, shield heater at 37.5%. The
jumper is still on the back of the vacuum guage PIC901. The compressor 
building backup air compressor was tripped again, I reset it. HIC 141 was 
set to 0.46 , I set it to 1.1 (closed position). Set solenoid inlet and 
outlet HIC's to valve closed positions. Energized warm return HIC's then 
slowly opened warm return valves to vent pressure in solenoid. Cracked open 
solenoid inlet valves to get abot 1.5 barA pressure on PI143 and PI146. LHe 
level started to drop. Contiued slowly until all LHe boiled away. PI143 and 
PI146 at about 5 barA. Had to adjust turbine speeds and shield heat. Opened 
cold returns then closed warm returns. Gradually increased solenoid inlet 
valves until wide open. Adjust turbine speeds and shiled heater. At about 
21:00 stable // cold return cooling. Temperatures dropping gradually. See 
files april25_2004_2113.BMP and april25_2004_2114.BMP 

Have powerlead supply valve HIC142 open to 0.46 during cooling just to see 
what happens. Time now about 21:42. Leaving system in // cold return 
cooling. Should be ready for series switch over in the morning.

PIC 229 was down to 10.8 bar this morning. PIC 229 was trying to open CV211 
to charge the system. I realized that in restoring the control to CV211 I 
did not get the wire into the connector properly. Went back up to the 
compressor building  and reconnected the control wire to CV211. pressure is 
back to 11 bar. TI121, LHE in and liquid level ripples are now all reduced.

System was ramped up to 500 amps yesterday at 14:00

Added two bottles of UHP helium to buffer tank.
Had no liquifation rate, so optimized Ti121 and HIC141 . Finally put TIC121 
into manual mode at 0.65. Power lead fluctuation died out and liquid 
started building. 
This morning changed TIC121 back to auto mode and played with it's setting 
to minimize the power lead and TI121 ripples. 
TI121 ripples seem tied to power lead ripples.
System seems stable enough to energize the solenoid.

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.

Switched to series mode.

Closed cv155

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.

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