RyanC, Rahul

I have finished the assembly of two Tip Tilt suspensions (HTTS D1001396_V3), and both of them will be used for Jitter Attenuation Cavity (JAC) for O5 run. These two Tip Tilt suspensions (see two pictures of the finished assembly over here - view01 and view02), named as JM1 and JM3 will be installed in HAM1 chamber in Dec-Jan 2025/26. Give below are the details about the assembly,

1. Wire diameter - 0.0017in or 43 microns (purchased from California Fine Wire company in 2025).

2. Mirror used on JM1 (identified by D1000768_v2 s/n4) -  E1900393_V1_02 s/n 16, AOI = 45 degrees

3. Mirror used on JM3 (identified by D1000768_v2 s/n28) -  E1900393_V1_02 s/n 09, AOI = 5.07 degrees

Details about mirror characterization work is posted in LHO alog 88040.

Both JM1 and JM3 optics have been suspended and coarse balanced, both in pitch and yaw. I will fine tune it once they are plugged-in for electronics testing. 

Wire pulling jig (D1100735_V1) - we faced some issues when we tried using the wire pulling jig - issue captured in this document. I have handed over D1100732 to Tyler for re-work. However, this was not a show stopper as TJ showed us how it was done before (see LLO alog 36765, Nov 2017) and we recreated it - see here for details (using mirror holder with the bottom wire clamp). Also, we have created the intentional wire offset (to compensate for the heavy optic pitching up) on the wire clamps to counterbalance the optic. We have also used a bigger pitch adjuster to give us more dynamic range.

Both the suspensions have their Bosems (four each) attached and next we will connect it to the test stand and start performing SUS health checks.