Coherences of OAF-CLEAN_DELTAL_EXTERNAL_DQ with all auxiliary channels
GPS 1338534018 + 600 s [2022-06-06 07:00:00 UTC
https://ldas-jobs.ligo-wa.caltech.edu/~gabriele.vajente/brucos/lho_1338534018_modulated/
Some highlights:
PEM-EX_MAG_EBAY_SUSRACK_Y_DQ
PEM-EX_ADC_0_19_OUT_DQ
LSC-REFL_A_RIN_OUT_DQ
ASC-CHARD_Y_OUT_DQ
PEM-CS_ACC_HAM6_OMC_Y_DQ
PEM-CS_ACC_HAM6VAC_SEPTUM_Y_DQ
The coupling from the magnetometer to strain is almost a perfect 1/f^2 shape.
The first two PEM channels are expected to be correlated with DARM. PEM-EX_MAG_EBAY_SUSRACK_Y_DQ monitors the suspension electronics for line sources; but it also picks up magnetic fields produced by currents to the actuators, such as to the PUM coils. PEM-EX_ADC_0_19_OUT_DQ monitors the +18V power to the ESD - strong DARM actuation loads the power supply and causes the voltage to drop slightly.
PEM-CS_ACC_HAM6_OMC_Y_DQ PEM-CS_ACC_HAM6VAC_SEPTUM_Y_DQ are accelerometers around the septum and provide more evidence suggesting that we should remove or replace the septum window.