IMC alignment was refined a bit as it changed. We used MC1 and MC3.

The beam with the correct polarization is clearing Faraday.

Used IM3 to center the beam on PRM iris, IM4 to center on PR2 iris, iterate.

• We ended up centering REALLY well on PRM iris but ~1mm too high on PR2 iris because IM4 DAC is already close to railing, and 1mm is nothing on PR2 (or on PRM for that matter). Since it doesn't matter much, we could have relieved IM4 by tilting IM3 down more (i.e. PRM iris too low) but I didn't bother.

The reflection from PRM was centered on the REFL baffle between HAM2 and HAM1 by tweaking PRM.

Misaligned PRM to steer the REFL beam on the high power beam dump through the viewport baffle on top of HAM2.  Pro tips:

• PRM PIT-YAW motion is NOT supposed to look orthogonal on the plane of the viewport baffle on the top, even if PIT/YAW are perfectly orthogonal at PRM. It's not a bad PIT-YAW coupling issue, it's just a poor projection plane issue.
• Use an IR viewer with long 75mm C-mount zoom to see the baffle. Don't lean into the chamber attempting to have a better view, just sit on the work platform and you'll have a good view and your upper body is far more stable . Move the beam by a big amount in PIT until you see the beam at the edge of the baffle hole, go in the opposite direction and do the same, take an average. Do the same for YAW. And you're roughly done. You don't have to do better than roughly.

Attached shows the alignment sliders for things as of now and good "misaligned" offset for PRM.

LVEA is laser safe. Tools and irises and such are still in HAM2 and HAM3.