TravisS, NikoL, JimW, RickS

This morning, after Jim locked the ICS, we aligned the ETM (to the OptLev) and installed the Pcal target on the ETM suspension frame.

We checked the gaps between Periscope upper flexures and the A7 adapter wall.  They were both well over  0.230", on both the front and back sides.   We rotated the upper flexure compression screws to decrease the gaps (increase the compression) to less than 0.220".

We then checked the centering of the Pcal beams on the periscope optics.  They were not too bad.

We then carefully aligned the Pcal beams to the input beam scribes on the Pcal ETM target (see attached photos) using the final relay mirrors on the input paths on the periscope structure and re-checked the beam centering on the periscope mirrors.  They were pretty good.

We removed the ETM alignment target.

We then carefully centered the beams on the input aperture of the Receiver Module integrating sphere using the turning mirrors in the Receiver Module.

Overall, things look pretty good, Pcal-wise, at Xend.