When we aligned TMSY to the ETMY such that the green beam retro-reflects from the ETMY, we needed to put about 400urad YAW offset in TMS suspension bias.

TMSY slider can take 600urad so there's still 200urad head room, but that's too thin a margin as it could be easily eaten by yet unknown ETMY YAW offset.

We used pusher setup to move the TMSY cage as we watched the beam motion. Fixing the dog clamps and removing the pusher moved the TMS back a bit, but we ended up with a perfect alignment with 40urad YAW offset, which is really good. We also adjusted the PIT balance by moving big slide masses under the TMS ISC table, and a small screw used as a weight on the TMS ISC table.

We aligned the IR transmission path that goes to ISCTEY by using the green beam leaking into IR path. We also adjusted the high power beam dump path. During this procedure we found that moving steering mirrors change the balance, and adjusted the slide masses again.

We will look at the IR QPD path tomorrow.