evan.hall@LIGO.ORG - posted 12:44, Friday 16 January 2015 - last comment - 16:23, Friday 16 January 2015(16116)
ETMX oplev recentered
Nergis, Evan
The ETMX oplev was badly miscentered in yaw. We have recentered it.
We did not make any changes to the whitening board settings. A picture is attached.
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Sheila, Evan
We have now engaged the ETMX L2 pitch oplev damping with the following filter settings:
-
FM1:
zpk([0],[50],10,"n") -
FM7:
ellip("LowPass",4,2,40,15) - Gain = -0.5 ct/ct
An OLTF of the damping loop is attached.
Qualitatively, this loop appears to make the buildup of ALS-X light more stable during locking activities.
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