We measured the free-hanging position (just damping) of the TMS again both at the tele input aperture and at the bottom periscope mirror using the total station, and then measured the dynamic range of the BOSEM.
At the input aperture it was off by 1 mm laterally (and the tolerance is 10mm) so we're very good.
At the bottom periscope mirror it was about 0.5-0.6 mm too low and 1.2mm off to the left (seems like the repeatability of this measurement is about 0.1 to 0.2 mm). It turns out that this is already good enough.
When we gave a huge PIT offset (the left and right BOSEM coil DAC channels should have railed) it moved +-2mm vertically, so 0.5-0.6mm off-cente in PIT is not a problem.
YAW is even lesser of a problem because it's much softer. We were able to move it by 8mm in one direction and 4mm in the other, even before railing DAC. The only reason why we didn't rail DAC was because the entire structure moved so much it interfered with something in the table cloth or BOSEM.
We're in a good shape.
We used flashlight to illuminate QPDs and confirmed that in-vac parts were all working. All segments and DC sum responded to the light sensibly.
There seems to be some heavy whitening going on, but we didn't match the dewhite. We can work on this later.
At this point, I'd say that we're done with initial alignment that we absolutely need to do. Even if we're told to stop right now, that's not a problem as far as the TMS and ISC are concerned.
Though I'm confident that nothing is touching, I'll have a look at the free swing spectrum on Monday.
I'll leave the judgement to the IAS as to whether or not we should pursue further/finer alignment. We could still try to inject an IR laser beam to hit the QPDs, and that's definitely a good thing to know if that works or not, especially for the future installations.
We're NOT done with checking the in-vac connection of picomotors and beam diverter. This could be done while SUS people are closing up next week.