Danny V., TJ S.

This morning we swapped the 1" PBS ALS-M11 for a 2" from Edmund Optics to relieve some of the clipping seen on the HWSEY. The procedure was the same as for EX, but this time we had to search around a bit for a spot to be seen on both QPDs. I think we got lucky last time. Once we found and centered the spots on the QPDs with good sums, we noticed that the spots on the WFS also looked centered. We then reengaged the loops for the QPDs and WFS, and all was good.

We then checked the HWS beam and it was still clipping, mainly from HWS-M1B & HWS-M1C (table layout: <a href="https://dcc.ligo.org/LIGO-D1400241">D1400241</a>). We swapped M1C with a picomotored optic holder, and after aligning that ran out of time.

There is more aligning to be done, as commissioning permits. Aidan also wants us to try a 50um core fiber, as our 200um diverges faster than we would like.