Oli, Daniel, Fil, Betsy, Rahul

We have re-installed SUS RM1 and RM2 Tip Tilt suspensions into HAM1 chamber which has the new ISI table - see several pictures attached below. RM1 is on the left (towards PSL side) hand side of this picture and RM2 is on the right (zoomed in). Both the suspensions are positioned roughly as per D1000313_V19, and will be fine tuned (pitch and yaw of the mirror as well) during beam alignment work. The blade springs of both the suspensions have been un-muted - see LHO alog 83984 for details.

Both RM1 and RM2 have been plugged-in to their electronics chain. We had to perform some troubleshooting with RM1 after observing grounding issues. At first Fil and Daniel ruled out any issues with the satellite box and in-air cables. After some investigation, the grounding issue was suspected to be coming from the in-vacuum quadrupus cable (connecting to the Bosem), which is an old cable and looks worn out too.

This morning I replaced the old Bosem cable (D1000228_v3 s/n S1105240) with a 25in long (D2100049 S/N 2200358) cable. Before connecting it to the Bosem, Daniel and I verified that the cable is fine (i.e not grounding) and later on we connected each pin (Bosem) one by one. We had to re-adjust the Kapton tape (installed for additional shielding) since the cable bosem connector was grounding to the chamber. After all these modifications, we can confirm that RM1 and RM2 are free from any grounding issues for now. We will check again before closing the chamber.

Next, I will start taking measurements on these suspensions and will post their health report soon.