New Feature Request: Tag for VAC glitches
Dave Barker found a lockloss coinciding with a glitch in the EX beam tube ion pump. We could add a tag to see if there are more occurrences.
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=82907
From Dave:
The beam tube ion pump detected a decrease in the vacuum by two orders of magnitude, from 1e-09 to 2e-07 Torr. H1 lost lock at this time, presumably due to photon scattering.
This gas quickly made its way to EX (only 100m away) but was spread out sufficiently by that time that VACSTAT didn’t alarm on the rise.
The vacuum gauges at X6 and Y6 are solar powered, so there are times in the winter when they stop updating if it's not been sunny for several days. Despite this, I’m going to add these gauges to VACSTAT to give the control room a “best effort” red light on the CDS overview when these glitches occur.
For your lockloss tool, you could look at the X6,Y6 gauges to see if they have recorded a glitch at the exact time of the lockloss, and/or look at the EX,EY gauges to see if a glitch shows up over the next few minutes.
Activity
Another example but with an LVEA sensor: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=83345
