peter.king@LIGO.ORG - posted 07:10, Monday 16 May 2016 - last comment - 08:10, Monday 16 May 2016(27204)
laser status
The laser was off this morning. The chiller indicated that there was a "Flow sensor 1" error.
Looking at the data from the various flow sensors, maybe, just maybe, the problem is with the flow sensor attached to the auxiliary circuit (which monitors flows to the power meters ...). The attached plot seems to imply that the flow to the power meters dropped before the crystal chiller flow declined. Would need to check that the power meters are really attached to this part of the cooling circuit because the diode chiller was running this morning. For reference the cooling system information is under https://dcc.ligo.org/DocDB/0067/T1100373/002/LIGO-T1100373-v2%20Coolant%20system%20operating%20and%20maintenance%20manual.pdf