cheryl.vorvick@LIGO.ORG - posted 19:31, Thursday 18 June 2015 - last comment - 13:05, Friday 19 June 2015(19237)
optic alignment shift in vs out of lock: PR2 pitch and PR3 pitch
Shiela showed me that PR3 alignment in Pitch is different for in vs out of lock, and it's about 1.5urad.
I've been looking at other optics, and today found that PR2 Pitch also has two distinct alignments of in vs out of lock.
Attached is a trend of PR2 during ER7, pitch on the bottom plot, that shows the two states.
The trend of PR3 pitch is essentially PR2 pitch inverted, however due to techincal dificulties, the plot is forthcoming.
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plot showing both PR2 pitch and PR3 pitch.
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