Reports until 16:24, Wednesday 07 November 2012
H1 IOO
paul.fulda@LIGO.ORG - posted 16:24, Wednesday 07 November 2012 (4627)
Parking beam viewport baffle installation

[Giacomo, Paul]

We installed the parking beam viewport baffle in HAM 2 this afternoon. The installation went smoothly; it was easy to access the viewport standoffs by sitting on the table with our feet on the HAM1 side nozzle. Just in case, we had put a C3 sheet over most of the the table to protect against dropped screws. I attached some images of the installation process. 

We did however notice a slight issue with the standoff posts. The posts have to be screwed into the viewport reducer by hand, and since they are cylindrical it is not easy to torque them very much. The silver coated screws that screw the baffle assembly to the standoffs are quite tight within the standoff thread though. Since the baffle assembly should be adjusted in rotation to pass the beam through the aperture, one may be required to unscrew these screws. Unless a pair of pliers or similar is used to hold the standoff in place, attempting to unscrew the screw that fixes the baffle assembly to the standoffs will instead unscrew the standoffs from the viewport reducer. This should be kept in mind for anyone adjusting the baffle rotation, and potentially for LLO / India installation too. It was suggested to look into a small redesign of the standoffs to fix this issue.

Images attached to this report