We've installed a minimum set of optics that are absolutely necessary for HIFO in HAM1. The list of installed optics will be alog-ed by Lisa.
We haven't payed any attention whatsoever to align them, as we don't have any beam for now. Things are just put in place, and we'll need to go back when the beam will be available.
Nothing could have been as smooth and as quick as this. One professor did all in-vac placement and bolt tightening. Don't know if these two things are correlated.
If we have time, we might install other stuff that are not necessary for HIFO in HAM1.
Broken black glass story
Before moving periscope assembly to HAM1, we've noticed that the black glass behind the top periscope mirror was getting loose. On a closer inspection, it turned out that actually the glass was completely broken and the larger piece was held in place just by a friction. The first picture shows the J-clamp with the broken shards of black glasses in the slot. We also observed a LOT of glass powder on the mirror, but fortunately this was all in the back (second picture). Lisa recleaned the mirror, we put another black glass, and everything was fine.
There could be more than one cause for this. Matt and Lisa noticed yesterday that the metal screw to hold the black glass was grinding and making some glass powder, so maybe we need to use PEEK.
Another thing is that, when tightening the J-clamp setscrew for attaching the J-clamp to the mirror holder (as opposed to tightening the screws for the glass), J-clamp moves in such a way that the black glass moves laterally towards or away from the mirror. If the tip of the black glass is already touching the mirror mount, which is hard to avoid unless you pay some attention, the J-clamp motion puts some torque to the black glass. So we need to make sure that the black glass doesn't touch the mirror mount.
And the slot in J-clamp for the black glass is too narrow anyway, sometimes you need to press it in really hard, sometimes it doesn't fit at all, and that doesn't help things. We need to make these grooves wider.