[Betsy, Koji] @Bonding lab

The OMC is sit in the bonding lab for curing of the epoxy. Otherwise, it is ready to be moved to the chamber side.

- 3rd OMC optics cleaning

Attachment 1:
We applied FirstContact cleaning of the optical surfaces. The optical side of the breadboard was wiped with IPA-soaked cloth (without touchting the optics).
The FCs will be left until the OMC is brought to the chamber side.

- PD replacement

Attachment 2:
The original OMC DCPDs were replaced with the new high QE DCPDs. The PDs at the BS transmission and reflection sides are from the PD cage A slot 3 (A3) and A4, respectively. They correspodns to the PD serials B1-01 and B1-16. The final testing at Caltech showed the QEs of 0.980 and 0.981 respectively.

The FirstContact seals are attached on the PD apertures to prevent particulates come into the PD surfaces.

- Mounting blacket bonding reinforcement

Attachment 3:
We added a glass prism to reinforce the bonding of one of the mounting blackets on the top (suspension) side of the OMC breadboard. A small amount of glue residue form the existing bond was removed by a razor blade to clean the place for the new prism. As small amount of glue as possible was applied to have round glue foot print, particularly on the glass-glass joint. The glue on the Invar-glass joint looks round. The glue on the glass-glass joint looks square inspite of our effort (We really don't think it is an issue). A steel block was added to hold the prism until the epoxy is cured.