chandra.romel@LIGO.ORG - posted 11:27, Thursday 30 March 2017 - last comment - 17:15, Monday 03 April 2017(35222)
HAM 6 pressure spike
HAM 6 pressure spiked at around 23:00 UTC time on 3/29.
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This looks like about the same time that we were testing the fast shutter. Do we get this kind of pressure spike during a normal lockloss?
We don't typically see spikes like this. We have been monitoring pressures across the site, including HAM 6, in 48 hr increments for a few months now to detect peculiar spikes like this.
Note that we saw several spikes like this before the failure of the OMC which Daniel attributed to "liquid glass": https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28840