aLIGO LHO Logbook

LHO VE

kyle.ryan@LIGO.ORG - posted 17:11, Sunday 14 February 2016 - last comment - 01:49, Monday 15 February 2016(25540)

Manually over-filled CP3

1635 -1700 hrs. local -> To and from Y-mid 

Behaviour a little different today.  ~5 minutes after opening the LLCV bypass valve 1/2 turn open there was no indication of vapor at the exhaust.  It took an additional 5 minutes after opening a full turn before complete.  As found, the exhaust pipe was noticeably absent most of the semi-permanent ice build up - warmer ambient temps? 

Next over-fill to be Tuesday, Feb. 16th before 4:00 pm

Comments related to this report

michael.zucker@LIGO.ORG - 01:49, Monday 15 February 2016 (25544)VE

Link

Re: this and the previous entry about exhaust LPM, it will depend on beam tube temperature (thermal radiation). We should model that and see if it improves predicted consumption.
Do we have thermometer channels?