camilla.compton@LIGO.ORG - posted 08:55, Tuesday 17 September 2024 - last comment - 12:59, Wednesday 02 October 2024(80132)
HWS Masks Reinstalled and code restarted.
WP 12080 After turning the HWS lasers back on in 80043, today I reinstalled the masks. To get the right amount of light on the CCD camera, ITMX is set to 1Hz and ITMY to 20Hz. New references taken at 15:50UTC, 30 minutes after we lost lock, so the IFO wouldn't have been 100% cold.
Comments related to this report
camilla.compton@LIGO.ORG - 15:48, Tuesday 17 September 2024 (80148)
Comparing to March 76385, the ITMX main point absorber looks to be heating up more than it has in the past but the main IFO beam also looks a little lower and offset than March (origin cross is the same), so that could be causing the point absorber to look different. The ITMX P2L is the same as March and Y2L 0.1 higher.
Images attached to this comment
camilla.compton@LIGO.ORG - 12:59, Wednesday 02 October 2024 (80431)
HWS is aligned and working well.
Plots are attached comparing 40 seconds, 120 seconds and 20 minutes after we power to 60W input.
Comparing to March 76385, the ITMX main point absorber looks to be heating up more than it has in the past but the main IFO beam also looks a little lower and offset than March (origin cross is the same), so that could be causing the point absorber to look different. The ITMX P2L is the same as March and Y2L 0.1 higher.
Noticed the ITMY HWS code had stopped, error attached. While we were out of observing today, I restarted it.