Mike V, Rick S, Darkhan T

This afternoon the alignment of the ETMX PCal IR path was finalized.  The upper/inner beam did not require adjustment of the periscope optics. The outer/lower path required realignment of two mirrors.

The alignment of the camera optics was finalized. The paths from both camera viewports were adjusted. The camera and enclosure that were installed in the upper viewport on the West side of the beamtube has been removed for this work, and will be re-installed at its final position in the lower viewport on the east side, next to the OpLev transmitter.

Particle counts were taken before, during, and after the in-chamber work.  After entering the chamber, Rick wiped the floor plates to reduce stirring up dust.  The actual counts will be posted as a comment, but the cleaning reduced the after-chamber-work particle counts from ~2000 cts to ~350cts for 0.3 micron/c.f.. A great improvement.