Reports until 09:07, Thursday 29 January 2026
H1 SUS (SUS)
rahul.kumar@LIGO.ORG - posted 09:07, Thursday 29 January 2026 (88957)
HAM7 OPO cable dressing (round 2) - Yaw shows no further improvement

Sheila, Jeff, Rahul

Yesterday afternoon we moved around two more cables on the OPO (see picture attached for reference). For the first cable (marked by circle) we lifted the cable connector from the OPO and attached it to the nearby pillar using a PEEK tie. For the second cable (marked by arrows in my picture) I provided more relief to it.

This morning I took transfer function measurements for Y dof (0.02Hz bw and 5 averages, with Yaw dof. un-damped and other dof. being damped during the measurement) - see screenshot attached below. I don't see any improvement (in frequencies splitting) - red trace is the latest measurement and blue is the previous one taken by Jeff two days ago.

Images attached to this report