User name Wilson TO
Log entry time 21:19:10 on July17,2005
Entry number 148380
target fan went off about 20.17
the alarm went so I turned the fan on again. time delay before turning the
fan on is unclear - about 30 seonds.
Then I noticed the heater power went from its usual 270 to about 900.
The target pressure also dropped below normal and set an alarm.
In retrospect the He gas must have vented when the fan went off.
Then as we were calling JP Chen I made the mistake of turning off the heater -
I should have switched it to manual and reduced the cooling (closed the JT
valve). This accentuated the overcooling. Hopefully there was no leak of air
or anything to solidify and block the pipes
At 21.15 JP is in the hall trying to fill.
Hopefully there is some He nearby.