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Entry  Wed Jun 15 15:03:41 2022, Koji, Update, PSL, PMC input beam aligned Screenshot_2022-06-15_15-03-16.pngPXL_20220615_212304650.jpg
    Reply  Thu Jun 16 15:29:03 2022, yuta, Update, PSL, PMC input beam aligned again, IMC  Screenshot_2022-06-16_15-27-30.png
       Reply  Wed Nov 16 11:56:21 2022, Radhika, Update, PSL, PMC input beam aligned again, IMC  Screen_Shot_2022-11-16_at_12.04.18_PM.png
          Reply  Mon Nov 21 09:13:31 2022, JC, Update, PSL, PMC input beam aligned again, IMC  
             Reply  Tue Nov 22 08:56:27 2022, JC, Update, PSL, PMC input beam alignment Screenshot_from_2022-11-22_08-58-45.png
                Reply  Mon Nov 28 11:21:25 2022, JC, Update, PSL, PMC input beam alignment Screenshot_from_2022-11-28_11-20-31.png
Message ID: 16917     Entry time: Wed Jun 15 15:03:41 2022     Reply to this: 16922
Author: Koji 
Type: Update 
Category: PSL 
Subject: PMC input beam aligned 

The commissioners complained about the PMC alignment. The PMC input beam was aligned. It made the transmission improved from 0.72 to 0.74.

FYI: Which steering mirrors do we use for the PMC beam alignment?
The mounts are indicated with the red arrows in Attachment 2.
You have to move these two in common and differential for each pitch and yaw.
The first steering (the right one in the picture) has the beam going through the immediate back of the mount.
So touching the yaw knob of this mount needs some care so that you don't block the PMC refl beam.

Attachment 1: Screenshot_2022-06-15_15-03-16.png  37 kB  Uploaded Wed Jun 15 16:05:08 2022  | Hide | Hide all
Screenshot_2022-06-15_15-03-16.png
Attachment 2: PXL_20220615_212304650.jpg  3.206 MB  Uploaded Wed Jun 15 16:29:04 2022  | Hide | Hide all
PXL_20220615_212304650.jpg
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