gabriele.vajente@LIGO.ORG - posted 15:42, Saturday 15 April 2023 - last comment - 17:30, Saturday 15 April 2023(68709)
Retuned MICH and SRCL feedforward
I retuned the MICH and PRCL feedforwards. The new filters are MICHFF FM4 '4-15-23' and SRCLFF1 FM7 '4-15-23'. Evan helped me accepting all SDFs and updating the guardian code.
The first two attached plots show the improvement in MICH and SRCL subtraction, particularly evident at low frequency. The two other plots show the measured coupling for MICH and SRCL and the filter fits.
This should help reducing the LSC contribution to the noise budget (to be remeasured ).
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Retuned the SRCL FF to improve the high frequency subtraction
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And now we also have a PRCL FF that gives us about 20 db of suppression between 20 and 80 Hz. Automated in guardian
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Improved version of the PRCL FF filter, with better suppression at high frequency
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