T. Sanchez, J. Oberling
This afternoon we took a look at the JAC Refl path and positioning of IOT1. We ended up pushing IOT1 in the +X direction by ~1"; new marks were made on the floor to represent this position.
From here we used JACR-M1 and JACR-M2 to align the beam through the viewport simulator and onto the top periscope mirror of IOT1. This only took a couple of iterations before things looked mostly OK. The beam is currently a little low in the viewport simulator, maybe 0.5" to 1" (rough measurement by eye) and is hitting the top periscope mirror. We finished by measuring the beam height at 2 places on the ISI table roughly 28" apart, to give us an idea of how the beam is pitched.
This seems OK for now, but on some reflection while sitting in my office typing this alog we may want to briefly revisit this. The beam is slightly pitched down and is high on JACR-M2 (~0.5" on a 2" diameter optic), so I think there is some room to improve this, to get the beam closer to center on JACR-M2 while still passing through the viewport simulator and onto the top periscope mirror of IOT1. More to come.