Reports until 14:54, Tuesday 20 December 2016
H1 IOO (IOO)
cheryl.vorvick@LIGO.ORG - posted 14:54, Tuesday 20 December 2016 - last comment - 16:35, Tuesday 20 December 2016(32781)
IM1, IM2, and IM3, changing alignment targets during the ramp up to O2, now have nominal values

The IM alignments were adjusted many times in the commissioning ramp up to O2, so IMs have not had nominal values for some time, and DIAG_MAIN values were not consistant with the current IM values.

I adjusted IM1-3 alignments after taking some measurements during maintenance today, and in looking at the IM alignment history.

I saw the IM1 pitch had bee restored to the DIAG_MAIN value yesterday, and this was not a correct value.

The current nominal values for IM1-3 OSEM alignments, as deemed good on Dec 8th at 09:00UTC, after a discussion with Jenne, are:

  pitch yaw
IM1 180 1120
IM2 608 -320
IM3 1961 -2

These are also listed in the IM Nominal Alignment medm (IOO sitemap list), and are updated in the DIAG_MAIN code.

To check IM alignment:

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cheryl.vorvick@LIGO.ORG - 16:35, Tuesday 20 December 2016 (32794)
Link

13 day trend - beginning of plots is where IM nominal alignment was set - after that, multiple ISI trips - some drift away from nominal - IM1 pitch change and recovery

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