R. Short, J. Oberling

While H1 was down this morning from wind, we took the opportunity to touch up PMC alignment and recalibrate the rotation stage. With the ISS off, we used the two picomotor-controlled mirrors to increase PMC TRANS from 106.0W to 106.2W and decrease PMC REFL from 21.4W to 20.9W. Not much of an improvement here, unfortunately, so we think this lines up with our theory of increased loss in the PMC cavity (discussed in alog78093). We're now starting to think about swapping the PMC with our fresh spare during a future maintenance period, especially if we see this loss getting worse, but no plan is currently set for that just yet.

After turning the ISS back on, I proceeded to recalibrate the rotation stage since the output from the PMC has changed a couple of times in the past week with our alignment changes. Calibration curve, SDF screenshot accepting new values, and text file from the process are attached.