Shroud panel update:
For the OMC Trans video beam, we further abused the shroud panel successfully move it enough such that the beam comes out. However, that made it somehow impossible to mount the panel on the cage using at least three screws.
We debated how we should secure the panel robustly, but in the end concluded that enlarging existing hole (by milling, good job Tyler!) is the way to go. That way we don't have to do crazy things for hardwares, the panels can stay where they are supposed to be. See Betsy's pictures for the milling vs drilling vs whatever-ing. The modified panels will be installed tomorrow.
We already installed a viewport simulator on HAM6.
Grounding problem was fixed:
ASC-AS_C grounding was fixed. We first touched the AS-AS_C cable on ISI table and nothing changed, we jiggled the cable coming from the top of the ISI to stage 0 and nothing changed, then we jiggled the section between stage 0 and the feedthrough and nothing changed.
Just to make sure, Rahul disconnected the DB25 connection on ISI table and the grounding was gone, which was a surprise. In the end, it was the unused QPD cable assy that was laying on top of the ISI table. ASC-AS_C and the unused QPD cable assy share the same DB25 connector. The shield collar on the unused PCB was touching the ISI table, causing problem for ASC-AS_C. We relocated the unused PCB so that it won't touch. See Rahul's pictures.
HAM6 grounding issues:-
Picture 1: shield collar on the unused PCB touching ISI table.
picture2: shield collar on the unused PCB readjusted and then grounding issues were gone.
picture3: showing in use QPD cable assy cable clamping/routing.
After some failed attempts to cut a hole out of a glass panel and retain the panel (not a thing stain glass'ers do apparently with standard cutting tools, according to google), we switched methods and got diamond glass hole saws. These chewed up the glass pretty badly (quite a few practice rounds attempting to improve such as faster, slower, more water, taped, sandwiched, etc). And we were leary of where the paint from the hole saw went. #thumbsdown.
Then Tyler decided to try milling a square out of the glass. Some more practice rounds and a new tooling fixture plate later, he managed a clean-ish looking square cut around the original 0.6" beam hole. There are 2 chips at the square but the square is 1.5" on a side so these chips should be well out of the beam way and we'll tyr to improve the setup tomorrow for panel 2. It may have some chips, but this solution seems to be the best mediocre solution we have come up with with the HAM6 team. Attached is the photo assay, ala Tyler and I, of the evolution in glass hole cutting which took most of the day. Note, the last picture showing the new square hole has egregious reflections of the room light in yellow rectangles and dirty smudges all over which will be cleaned, both of which you should ignore.
https://dcc.ligo.org/DocDB/0117/D1500044/002/D1500044-v2.PDF Is the back panel modified today (not shown on drawing, but for part number ref).
Tomorrow I will clean this piece and help install it at the -Y OMC side of the shroud assy, while Tyler performs the same type of square-hole cut on the +X panel spare (D1500045).