camilla.compton@LIGO.ORG - posted 10:40, Thursday 05 October 2023 - last comment - 14:31, Thursday 05 October 2023(73289)
ETM Ring Heater Test During Observing from 17:35UTC
Ryan C, Camilla. We popped into commissioning to adjust the ETM ring heaters up from 1.0W to 1.1W/segment at 19:35 17:35UTC, accepted changes in sdf. Back in observing while the slow thermalization happens, plan to revert to nominal in 3 hours at 20:35UTC. This weeks past ring heater tests are 73093 and 73272.
Circulating power decreased 3kW, ndscope attached, kappa_c 0.3% decrease. HOM peaks moved down in frequency as expected. High frequency noise slightly decreased but this could be due to the reduction in circulating power. 52Hz jitter noise in DARM shows an increase.