User name Armstrong
Log entry time 06:06:59 on May19,2008
Entry number 238723
keyword=Target: brief alarms
Target alarmed - the ESR supply temperature (haCryo_Supply_T)
went above the yellow and red alarm limits (both are set to 14.50 K
at present); it went up to 14.54 K. High power heater was down to zero W. Tried to open up JT valve two steps of 1%. Cell had
warmed by 0.2 K to 22.2 K. Cycled HPH from PID to manual (10 W) back to PID. After about 2 minutes, the 15 K supply temperature went
back down below the alarm point (now 13.95 K), and cell cooled
back down to 20.00K, and HPH turned back on.
After another minute or so, returned JT valve to original
setpoint, and all is back to normal.