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Reports until 01:34, Tuesday 21 June 2016
H1 SUS (ISC)
nutsinee.kijbunchoo@LIGO.ORG - posted 01:34, Tuesday 21 June 2016 - last comment - 13:43, Tuesday 21 June 2016(27872)
Violin mode 2nd harmonics work

Because we used up all the filter banks for the fundamentals, I made broadband filters for the high ETM 2nd harmonics.

 

ETMX 1003.664, 1003.778, 1004.078 and 1004.537 are damped with MODE9 FM1, FM4, FM10 (notch at 1003.907 Hz) with -50 gain.

butter("BandPass",4,1003.67,1004.54)gain(120,"dB")*gain(100,"dB")* ellip("BandStop",2,3,40,1003.807,1004.007)

This filter was later found to be ringing 1003.778 Hz. It has to be reconfigured. The individual damp settings for 1003.664, 1003.778, 1003.907, 1004.078, and 1004.537 are 0deg, +-180deg, 0deg, +-180deg, and 0 deg. 

ETMY 1009.44 and 1009.49 are damped with MODE10 FM1, FM4 with +150 gain

butter("BandPass",4,1009.44,1009.49)zpk([0;0],[],1,"n")*gain(100,"dB")

ETMY 1008.45, 1008.49, and 1009.02 are damped with -60deg, -60deg, and 0deg (all + gain). No broadband filter has been made yet.

 

The other high amplitude modes that I haven't tried to damped are ETMX 1005.17, 1005.94, and 1006.5

Comments related to this report
nutsinee.kijbunchoo@LIGO.ORG - 13:43, Tuesday 21 June 2016 (27889)

ETMX MODE9 FM1 now covers 1003.667, 1003.778, and 1003.907. The face are correct here and should be damped with positive gain setting.

ETMY MODE 9 FM1 now covers 1008.45, 1008.49, 1009.02. The phase is close to what damped last night. Still has to be tested.

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