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Entry  Mon Sep 13 09:15:15 2021, Paco, Update, LSC, MC unlocked? VAC_2021-09-13_09-32-45.png
    Reply  Mon Sep 13 15:14:36 2021, Anchal, Update, LSC, Xend Green laser injection mirrors M1 and M2 not responsive 
       Reply  Thu Sep 30 14:13:18 2021, Anchal, Update, LSC, HV supply to Xend Green laser injection mirrors M1 and M2 PZT restored 
Message ID: 16320     Entry time: Mon Sep 13 09:15:15 2021     Reply to this: 16322
Author: Paco 
Type: Update 
Category: LSC 
Subject: MC unlocked? 

Came in at ~ 9 PT this morning to find the IFO "down". The IMC had lost its lock ~ 6 hours before, so at about 03:00 AM. Nothing seemed like the obvious cause; there was no record of increased seismic activity, all suspensions were damped and no watchdog had tripped, and the pressure trends similar to those in recent pressure incidents show nominal behavior (Attachment #1). What happened?

Anyways I simply tried reopening the PSL shutter, and the IMC caught its lock almost immediately. I then locked the arms and everything seems fine for now cool.

Attachment 1: VAC_2021-09-13_09-32-45.png  74 kB  Uploaded Mon Sep 13 10:36:28 2021  | Hide | Hide all
VAC_2021-09-13_09-32-45.png
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