camilla.compton@LIGO.ORG - posted 14:52, Wednesday 11 October 2023 - last comment - 16:21, Wednesday 11 October 2023(73393)
MICH and SRCL LSC FF Remeasured
Camilla, Jenne. Started in 73345. H1 had been locked ~5 hours.
Didn't exactly follow instructions in lsc/h1/scripts/feedforward/README.md, as took residual measurements with no FF and took FF measurements with actuation through ETMY PUM rather than ETMX.
- IFO taken to NLN_CAL_MEAS, turned MICH and SRCL FFs off (gains to zero), took MICH_excitation.xml and SRCL_excitation.xml measurements.
- Swapped FF actuation from ETMX to ETMY PUM with attached script (Jenne pasted line-by-line into interactive 'guardian'), ramp MICHFF /SRCLFF gain to 0, turn off all FF's but keep highpasses on, turn off INPUT, ramp gain back to 1, took MICHFF_excitation_ETMYpum.xml and SRCLFF_excitation_ETMYpum.xml measurements.
- Exported all data to .txt files.
- Didn't correctly undo the ETMY to ETMX FF actuation swap and caused a lockloss.
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Gabriele helped fit the filters and we saved them to MICHFF and SRCLFF as 10-11-23-EY.