Aritomi, Matteo, Yao-Chin, and Yuhang

We opened the PR chamber on last Friday. But moving the last IR back reflection steering mirror, we solved the cut issue of this beam.

Attached figure 1: We just opened PR chamber, we checked with IR viewer. We could see a beam on the right side of chamber window.

Attached figure 2: After moving the last IR back reflection steering mirror, we made IR back reflection hitting on the window. And this IR back reflection is between IR(injection) and GR.