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Reports until 09:08, Friday 30 August 2024
LHO VE
david.barker@LIGO.ORG - posted 09:08, Friday 30 August 2024 - last comment - 10:20, Friday 30 August 2024(79812)
HAM6 vacuum glitch

at 00:29 Fri 30 Aug 2024 PDT there was a short vacuum glitch in HAM6 detected by PT110_MOD1.

The pressure increased from 1.90e-07 to 2.06e-07 Torr.

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david.barker@LIGO.ORG - 09:10, Friday 30 August 2024 (79814)

Gitch was detected by VACSTAT.

VACSTAT is in testing mode, and the MEDMs still needs some polishing. The Overview and PT110 MEDM are attached.

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david.barker@LIGO.ORG - 09:13, Friday 30 August 2024 (79815)

Gitch time doesn't appear to be related to H1 locking or unlocking. 24 hour PT110 and H1 range trend attached.

The smaller, wider glitch on left was at 16:51 Thu and is known about (pump operations as part of noise hunting). The 00:29 glitch is the larger, sharp one to the right.

Images attached to this comment
david.barker@LIGO.ORG - 10:20, Friday 30 August 2024 (79818)

I've promoted VACSTAT from a H3 test system to a H1 pre-production system. This allows me to add the channel H1:CDS-VAC_STAT_GLITCH_DETECTED to the alarms system (alarms was restarted 10:15). For testing it will send alarms to my cellphone.

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