kiwamu.izumi@LIGO.ORG - posted 23:46, Tuesday 07 October 2014 - last comment - 09:08, Wednesday 08 October 2014(14357)
SRM M0 stage sensor is not healthy
There is a huge peak at 60 Hz in the damping singals on M0 of the SRM suspension. Also the noise floor seems too high compared with PRM. This must be fixed.
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This has been this way for a long time....
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Not that it should be prevent looking for and solving the problem, but this is most likely related to Integration Issue 935, see original discovery aLOG LHO aLOG 13556. Richard will be looking at it this morning, potential cutting ex-vacuo cabling to try to fix this known in-vac problem.