40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
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
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
ELOG V3.1.3-