Jeff, Sheila, Rahul
Details about OPO health check issues (Yaw dof. - frequencies are off and unnecessary peak observed) is currently being analyzed - see Jeff's alog 88913.
This morning we discussed about possible cable interferences in OPO.
I went into the chamber and took fresh pictures of the OPO from several angles, focusing on cable routing, cable resting on the OPO etc - please find them attached below. I will compare them with the pictures posted in LHO alog 61643 (by Sheila in 2022) and look for possible culprits (a few of them already).
Moving cables could cause some misalignment, hence we will start doing so once Sheila gives us a green light.
This afternoon Sheila and I went into the chamber and nudged some of the cables away from the OPO - Jeff will re-check the TF measurements to look for any improvements.
There is a cable connector sitting on the OPO (which is a new addition to the OPO). I lifted that cable connector and then Sheila looked for alignment shifts - which she confirmed. For now we left the cable connector at the same spot on the OPO. We will think of moving it away after Jeff's results.
Sheila also found some changes in the beam alignment since last week - not sure if this is due to our work (AOSEM re-centered LHO alog 88910) from yesterday - although centering aosem-flag should not change the mechanical alignment.