camilla.compton@LIGO.ORG - posted 12:37, Tuesday 16 May 2023 - last comment - 15:27, Friday 28 July 2023(69648)
Turned back on both ETMX and ETMY HWS Lasers and Cameras after 1 week test
WP 11184 This morning, Tony and I turned back on both ETMX and ETMY HWS lasers and their cameras. Had them off for one week (alog 69431) to check for any noise caused by them. Tagging DetChar.
Comments related to this report
ansel.neunzert@LIGO.ORG - 15:27, Friday 28 July 2023 (71797)DetChar
Evan Goetz, Debasmita Nandi, Taylor Starkman, Ansel Neunzert
We compared the weekly average spectrum starting May 10 with the week starting May 17. We saw a few noticeable changes in the weekly spectra, but careful follow-up shows that several of them are unassociated with the HWS changes. In particular, daily spectra show that changes in the 29.96 Hz and 1.66 Hz combs do not happen at the same time as the HWS changes.
There is a small 14.9009 Hz comb that seems to turn on during the week of the test and off afterward. (That is, the comb seems to be associated with the HWS being in the off state, which is fairly counterintuitive). Only a few peaks are visible, and it has not been noticed since.
Mostly noting these things here for future reference and searchability. We do not see large-scale spectral changes associated with this test.
Evan Goetz, Debasmita Nandi, Taylor Starkman, Ansel Neunzert
We compared the weekly average spectrum starting May 10 with the week starting May 17. We saw a few noticeable changes in the weekly spectra, but careful follow-up shows that several of them are unassociated with the HWS changes. In particular, daily spectra show that changes in the 29.96 Hz and 1.66 Hz combs do not happen at the same time as the HWS changes.
There is a small 14.9009 Hz comb that seems to turn on during the week of the test and off afterward. (That is, the comb seems to be associated with the HWS being in the off state, which is fairly counterintuitive). Only a few peaks are visible, and it has not been noticed since.
Mostly noting these things here for future reference and searchability. We do not see large-scale spectral changes associated with this test.