david.barker@LIGO.ORG - posted 08:58, Thursday 27 November 2025 - last comment - 01:39, Monday 01 December 2025(88265)
FCES VEA temperature drop overnight
FMCSSTAT alarm is for the FCES temperature drop. The heating cycle stopped around 22:15 Wed 26nov2025 and the room temperature has been dropping since.
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Richard has asked for a cell phone alarm on FCES VEA temperature. I have added the following alarm:
<Channel name="H0:FMC-FCES_VEA_SPACE_TEMP_DEGF" low="39" high="90" description="FCES VEA Temp">
which texts/emails Richard and Tyler if alarm persists for 10 minutes or more.
On a positive note the drop on temperature aides the internal pressure of all vacuum envelopes, internal to HAM8 and HAM8 annulus. See attached plot for internal pressure of HAM8 for a change of about 2.0x10-08 Torr.
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