[Georgia, Jenne]
With the new alignment after the arm peek and the locking of DRMI, we popped in to HAM6 to confirm that all of the clearances are okay, and the beam is well centered on all of the in-vac optics. Summary: we need a dog clamp (email already out to Corey to grab us some), and a teeny bit more work tomorrow, then we're done.
* Clearances seem good, although it would be good for another set of eyes to have a look at the shutter-closed wire clearance.
* We were a bit high on the last steering mirror and the lens in front of AS_C, so Georgia centered us up using the steering mirrors closer to the OM1 transmission point.
* We need to re-look at the AS WFS path. We're a little too close to the edge of the first mirror in transmission of OM3, but can't move the mirror appropriately until we have another dog clamp. Right now it's got one dog, and one bolt in a hole. But, we need to move another mm or so, and then won't be able to use the bolt hole. We're a little close in range on the steering mirror in front of AS_B, so we might also relieve some of that with the upstream mirrors while we're in chamber tomorrow. Also, the beam isn't centered well enough on the BS that splits the 2 WFS beams, or on the lens in front of that BS. So, basically the whole AS WFS path needs attention, but the first thing is that first mirror that needs a new dog clamp.
* There is a connection on the fast shutter that seems like it might be loose. Georgia will post a photo in a comment to this alog. We should make sure this is fully seated.
Here's the photo of the potentially dodgey shutter connection. I'm not sure what these are supposed to look, but it seems like it's on an angle and maybe not all the way in.
We went in today and successfully finished fixing up the AS WFS path.
There are 2 steering mirrors, a lens, and then the beamsplitter before the WFSs. We shifted the first steering mirror after OM3 position so the beam hits its center (clamped with a new dog), and steered this mirror to re-center the beam on the second steering mirror. We used the second steering mirror to center the beam on AS_A. We then re-centered the beam on AS_B with the mirror directly in front of it, this is now no longer at the edge of its range. The fine alignment was done using the AS-centering and OMC QPD loops.