sheila.dwyer@LIGO.ORG - posted 17:36, Monday 01 June 2015 - last comment - 19:10, Monday 15 June 2015(18762)
SRC angular controls
It seems that the pitch control signal sent to SR2 (from the AS_C sensor) is correcting mostly for motion of SR3, especially in the first hour after powering up. We should think about changing this feedback from SR2 to SR3 after the engineering run.
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Some more information:
As the interferometer gets warmed up, SR3 pitches by 0.7 urad upward while SR2 pitches down by 10 urad via the SRC alignment loop. On the other hand, it is hard to tell how SRM reacts to the heated interferomter. See the attached trend which has the same time period as that Sheila posted.
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