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Reports until 09:18, Wednesday 22 July 2015
H1 IOO
betsy.weaver@LIGO.ORG - posted 09:18, Wednesday 22 July 2015 - last comment - 09:20, Wednesday 22 July 2015(19831)
Rotation stage poor performance - no new news here

Attached is a 6 day trend of the H1IMC-PWR_IN showing how the rotation stage finds a variety of stopping places when executing the same request.  This is a long-time known issue, so I'm just reposting to make the problem visible again.  In theory the asc/lsc is supposed to compensate for power-in differences, but a it's hard to hand-wave off a ~25% difference from one down state to another - it makes troubleshooting slow acquisition more muddied than it already is.

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betsy.weaver@LIGO.ORG - 09:20, Wednesday 22 July 2015 (19832)

And here's the high powere full lock rotation stage power request compared to the actual power.

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