WP 11184  This morning I turned off both ETMX and ETMY HWS lasers and their cameras. Plan to leave them off for one week check for any noise caused by them. Tagging DetChar. 

 

We have the M1900163 laser sources installed, EX was installed after the end of O3 62089, EY in O3a/b break 52513. LLO does not have these installed as we showed that they didn't work well (66953, 66011).

The cameras have SYNC frequencies 10Hz and 6Hz for EX and EY. All HWS cameras are powered by external power supplies on the floor to mitigate noise from these frequencies entering DARM (FRS4559).