cheryl.vorvick@LIGO.ORG - posted 22:45, Tuesday 08 December 2015 - last comment - 09:17, Wednesday 09 December 2015(24064)
ETMY ISI blend filters changed - big improvement in motion in Y and RX
Evan Hall suggested changing ETMY ISI blend filters after a couple lock losses between DRMI and ENGAGE_ASC.
The change from all Quiet_90s to Quiet_90 in X direction, and 45mHz in Y direction was easilly seen on ST1_ISO_RX and ST2_ISO_Y, and the ASC control signal in pitch being sent to the optic, ASC-ETMY_PIT_OUTPUT.
Plot attached shows those channels before and after the blend filter change, and ETMX ASC control signal, to compare.
Current blend filter config. medm is also attached.
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Comments related to this report
Why are the y blends set different from the X blends?
Over the past month or so, having the 45 mHz blends on EX causes the ISI to ring up in full lock (for example: alog 23674 and comments).