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 Apr 1 23:56:36 2015, ericq, Update, LSC, X Green Power drifting Xgreen_drifting.png
    Reply  Thu Apr 2 01:28:34 2015, Jenne, Update, LSC, X Green Power drifting 
       Reply  Thu Apr 2 01:45:44 2015, Jenne, Update, LSC, X Green Power drifting 
Message ID: 11191     Entry time: Wed Apr 1 23:56:36 2015     Reply to this: 11192
Author: ericq 
Type: Update 
Category: LSC 
Subject: X Green Power drifting 

Something funky is happening with the green light locked to the X arm. The green transmitted power is drifiting around. Maybe something weird is happening with the doubler? The digital thermal feedback loop is not on. 

The green has been locked on a TM00 mode this whole time. The step in power is me closing the PSL green shutter, but I'm not doing anything during the smooth changes in power. IR power is steady, so the alignment should be ok. I can't recover full power with the end PZT alignement either. 

 

Attachment 1: Xgreen_drifting.png  26 kB  Uploaded Thu Apr 2 02:44:52 2015  | Hide | Hide all
Xgreen_drifting.png
ELOG V3.1.3-