camilla.compton@LIGO.ORG - posted 16:56, Monday 19 December 2022 - last comment - 09:12, Tuesday 20 December 2022(66465)
CO2 X and Y stepper scheduled for 9pm and 2:30am if IFO in NLN tonight.
After successful alog 66429, we are going to try common steps of 0.2W on CO2s every 20 minutes tonight. I have scheduled the script to run at 9pm and 2:30am if the IFO is in NLN. Two times to increase changes that we'll get a successful measurement. If we loose lock while the test is running ISC_LOCK will take control of the CO2s.
step_timer = 1200 # 20 minutes
if optic == 'ITMX':
power_list = [3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, 4.6, 4.6, 4.3, 4.0, 3.7, 3.4, 3.0]
elif optic == 'ITMY':
power_list = [1.3, 1.5, 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.9, 3.0, 2.7, 2.4, 2.1, 1.8, 1.5, 1.3]
Increasing the CO2s common in both arms seemed to have a small negative effect on the IFO.
The arm powers and PR GAIN stayed constant but RF18, 90 and our measures of mode matching (TDEP_F_C and _KAPPA_C) decreased, see plot1 and plot2 attached. IFO had been locked/ thermalizing for 4 hours when the tests began.