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Reports until 05:38, Friday 13 November 2015
H1 SEI (Lockloss, SEI)
cheryl.vorvick@LIGO.ORG - posted 05:38, Friday 13 November 2015 (23367)
lock loss and ETMY ISI

Three plots attached

Plot 1:  ETMY ISI right before lock loss.  Clear to see motion increasing, and Z positoin rings ups about 45 seconds before lockloss.

Plot 2: ETMY ISI after lock loss.  The ringing in the CPS_X sensor

- at 7:14UTC ISO RX output sees something and the signal grows to 4x it's previous size - red oval

- at 8:10UTC CPS X Location Mon rings up, Jeff and I disable FM8 Boost3, signal quiets around 8:55UTC

- later, with no locking, I disable and enable again to measure a power spectrum (X and Y)

Plot 3: power spectrum comparing ISO X in

--- 2:49UTC (ref6 ,7) - baseline

--- 7:50UTC (ref8, 9) - ISO RX has run up a bit, but ISO X isn't yet

--- 8:45UTC (ref10, 11) - Boost3 turned off on ISO X

--- 10:27UTC (ref22, 23) - as a test I turned off ISO Y Boost3, and yes, it's noticable (bottom plot)

--- 12:22UTC (ref24, 25) - current state, Boost3 filters have been back on since around 11UTC, winds are between 15mph and 40mph, useism is around 0.8 (slightly better than 1.5 hours ago)

Images attached to this report
Displaying report 1-1 of 1.