Today, Keita, Jenne, TJ, Nutsinee, Rahul, and I went in to inspect the beam paths that come from the AS viewport and to components towards the OMC. This is a pre-check of the beam location prior to the planned viewport swap early next week.
I verified that the viewport assembly does in-fact look to be the expected D1101095 s/n 003 assembly - I could see the D1101005 stamp (but no s/n) on the viewport glass itself, and the VP metal clamp part was labeled D1101115 s/n 007 - all consistent with the ICS assembly records which state the location of Septum Output. The D1101005 stamp on the optic was at the bottom of the barrel, which according to the drawing means the arror (thick part) is on the 3 o'clock position, as previous installation alogs report. Good.
The location of roughly where the beam comes through the VP is shown in the attached picture. Because we did not want to get the card too near the viewport surface, it the view is a little bit subject - I tried to get the camera view roughly at the beam height.
Jenne then steered the SM to center on the AS_C QPD. Things looked pretty aligned along the path.
Pictures 3,4,5 are of beam location pitch and yaw views in front of OM1, and then location of beam in High Powered beam dump aperture.
Attached some of the not-so-scientifically-useful photos as requested by Betsy. If anyone needs high resolution of any of these photos ping me.
Additional photos.
1st one is the beam going from the septum to OM1, getting close to the fast shutter (but it's not really that close in reality).
2nd one is the septum viewport itself, the thicker side mark is in +X direction. We couldn't see any IR scatter with this exposure setting (this is an IR-sensitive camera). IMC was locked at 5W, so the power hitting this window should have been roughly 10*3%*25%*32%=24mW.
The last one is the photographer taking selfie using the reflection on my safety glasses.
These are all before the viewport swap, obviously. After-the-swap photos are available in another alog (52409).
