Robert, Sheila, Nutsinee
Today we removed a view port cover on HAM5 north door (faraday side) to look for the IFO beam reflected off AR side of the thin film polarizer. Attached a couple photos we took with our IR camera (Nikon D7100 with IR filter removed)-- We found the beam hitting the HAM6 side of the ZM2 cage. The beam moved towards HAM4 when we did positive yaw on SR2 and moved up when we did negative pitch. This is consistent with how the rejected polarization beam moved in HAM6.
According to Koji's calculation and Corey Austin's response to our alog last night (alog41403) we suspect that our wedge is in the opposite direction.
I changed the direction of the wedge on the TFP in the model and found that the ghost beam lands on the bracket for ZM2 as was seen IRL by Nutsinee, Robert, and Sheila.
