Jenne, Camilla
We've moved the LSC FF from ETMX to ETMY PUM and turned on the new LSC FF filters measured in 73393.
This has reduced noise above 50Hz but increased noise below 50Hz, plots attached of the FF and DARM, compare gold to pink. H1 range is simular.
We've left this configuration, edited ISC_LOCK for this to be the new nominal and accepted attached sdfs. We plan to work to iteratively improve the filters in the next few hours with a new set of measurements we took this morning ~18:40UTC.
Jenne and I re-fit new filters iteratively to using the measurements we took this morning and loaded new filters into MICHFF and SRCL1FF, sdf safe and observe accepted and ISC_LOCK updated. H1 range is up ~7Mpc, plot attached, thin line is without cleaning.
We are hopeful that now the LSC FF is driven on ETMY, it will not need to be tuned as often as won't be effected by changing charge ETMX.
Attached MICH excitation comparison (new trace is light blue) which shows we are putting in more MICH 20Hz that previously but this isn't visible in DARM. Note that during the day today Tyler/Robert has turned off fans, reducing peaks ~25, 40, 52Hz 73424.
We checked that these LSC FF filters are not injecting any low frequency noise into DARM.
