Reports until 11:01, Monday 05 August 2024
H1 SUS (SUS)
rahul.kumar@LIGO.ORG - posted 11:01, Monday 05 August 2024 (79451)
HAM5 SRM inspected and two EQ stops adjusted

Jeff K, Betsy, Rahul

Making a late entry for SRM rubbing investigation which happened last Thursday (see alog 79425). We went to HAM5 chamber and closely inspected SRM and all the EQ stops for any signs of rubbing. I couldn't see any of them touching/rubbing the chain, also at some places it was hard to see since the suspension is covered in shroud. However, at two places I felt the EQ stops were too close for my comfort, hence I very slightly adjusted them (to create a visible air gap) - first at optic barrel EQ stop and second at the metal upper mass stage. 

Using a dental mirror I also checked the LF and RT bosem flags and found that that LF BOSEM flag is very close to the top LED/PD, with both offsets ON and OFF (was hard too spot any difference) - I am attaching a picture which I took on Jeff's phone. I did not adjust the LF bosem - since we didn't wanted to change the alignment.

Images attached to this report