This us a follow up of https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=17788.

What was done:

1. A round piece of Lexan was cut out by Bubba. It is dropped in over the viewport such that it securely sits on top of the viewport flange without touching the viewport.
2. The old lexan cover was removed and the new one was dropped in.
3. The old lexan protector assy was removed.
4. The new beam dump optical table assy was installed.
5. LVEA was transitioned to the laser hazard, MC was locked at 2.2W, PRM was misaligned.
6. The beam was not found, so PRM was scanned until we have a reasonable beam. At this point, we were only getting 1W out.
7. Alignment of the PRM was further adjusted until we get 1.6W or so through the lexan. Steering mirror was aligned to send the beam to SiC plate.
8. Lexan plate was removed, the beam dump alignment was still good, and we were getting 1.8W out of 2.2W we sent in. The beam goes through MC and then Faraday twice, and this is a reasonable number. According to Paul, MC (one way) and FI (one way) combined efficiency is about 85%. Assuming that FI is 90% one way, in our case it's a total of 0.85*.9=0.77. And 2.2W*0.77=1.7W.
9. The lid of the assy was put on.
10. Though unrelated to the beam dump, Gerardo found that the accelerometer on HAM2 was knocked/moved from its intended position. It was already like that when we climbed up on HAM2 yesterday.

Corey took a bunch of pictures, which he will post on resource space.