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  Mon Sep 30 13:02:51 2013, Masayuki,Manasa, Update, IOO, PMC and MC alignment 
    Reply  Thu Oct 3 01:24:31 2013, Jenne, Rana, Update, IOO, PMC  PMCR_1064822387.bmppmc80.png
       Reply  Sun Oct 6 22:52:09 2013, Jenne, Rana, Update, IOO, input beam to PMC aligned again pmcr.png
          Reply  Mon Oct 14 17:51:40 2013, Jenne, Update, IOO, input beam to PMC drifted again 
             Reply  Mon Oct 21 13:15:52 2013, Koji, Update, IOO, PMC aligned 
             Reply  Fri Oct 25 10:45:16 2013, Steve, Update, PSL, laser drift monitor set up laserDriftMon.jpgPMCT_120d.pngPMCT_1000d.png
                Reply  Fri Oct 25 19:56:58 2013, rana, Update, PSL, laser drift monitor set up PMC-IRSISSS.pngPA250052.JPGPA280044.JPG
                Reply  Fri Jan 10 15:33:02 2014, Steve, Update, PSL, laser drift monitor set up idea 2daysDrift.png
                   Reply  Mon Jan 13 11:08:48 2014, Steve, Update, PSL, 3 good days of IOO pointing 3gdPSLpointing.png
                   Reply  Tue Jan 14 10:12:12 2014, Steve, Update, PSL, laser drift monitor set up idea bad4thday.png
Message ID: 9291     Entry time: Fri Oct 25 10:45:16 2013     In reply to: 9238     Reply to this: 9292   9547
Author: Steve 
Type: Update 
Category: PSL 
Subject: laser drift monitor set up 

Quote:

Quote:

I wonder what's drifting between the laser and the PMC? And why is it getting worse lately?

 The PMC refl is bad in pitch today, and the transmission is only 0.76, rather than our usual 0.83ish.

I did a quick, rough tweak-up of the alignment, and now we're at 0.825 in transmission.

 The PMC transmission continuously degrades. In order to see what is really drifting the laser output after PBS was sampled as shown.

Attachment 1: laserDriftMon.jpg  1.288 MB  | Hide | Hide all
laserDriftMon.jpg
Attachment 2: PMCT_120d.png  34 kB  Uploaded Fri Oct 25 12:01:52 2013  | Hide | Hide all
PMCT_120d.png
Attachment 3: PMCT_1000d.png  33 kB  Uploaded Fri Oct 25 12:20:43 2013  | Hide | Hide all
PMCT_1000d.png
ELOG V3.1.3-