aLIGO LHO Logbook

H1 General (TCS)

oli.patane@LIGO.ORG - posted 12:30, Wednesday 19 July 2023 - last comment - 12:59, Thursday 20 July 2023(71506)

Pushed out of Observing by TCS-ITMX SDF Diff

At 18:50, we were briefly pushed out of observing when the ITMX CO2 laser lost lock, and the resulting SDF differences in H1:TCS-ITMX_CO2_CHILLER_SERVO_GAIN & H1:TCS-ITMX_CO2_PZT_SERVO_GAIN (see attached). The SDF differences disappeared on their own about a minute later as the CO2 laser locked back on, and we observed that the power in H1:TCS-ITMX_CO2_LSRPWR_HD_PD_OUTPUT went down slightly from 46.7W before it lost lock to 46.4W after it locked back on.

At 18:53 we put the detector back into Observing

Images attached to this report

Comments related to this report

camilla.compton@LIGO.ORG - 12:59, Thursday 20 July 2023 (71554)

Link

This is the third time this has happened in 1 month, see 71213, 70910. We should investigate what the issue is. We had seen similar behavior with CO2Y in the past and blamed the CO2 chiller, 54980.