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  Sat Nov 24 23:50:35 2012, Koji, Update, IOO, MC WFS refusing to work 
    Reply  Thu Nov 29 00:15:13 2012, Den, Koji, Update, IOO, MC WFS work wfs_fb.pdfDSC_4942.JPG
Message ID: 7741     Entry time: Sat Nov 24 23:50:35 2012     Reply to this: 7761
Author: Koji 
Type: Update 
Category: IOO 
Subject: MC WFS refusing to work 

Today I found the IMC was misaligned significantly by WFS feedback.
Once the feedback was cleared, it locks with nice visibility.
But WFS misaligns it again as soon as the intergrators are engaged.
I checked the beam on the table, but found nothing really wrong.
The offsets of the error signals were nulled at the input filter modules of the WFS segments.
They did not fix the problem.

The instability started about 48hour ago, that means my work on the AP table did not 
made immediate trouble. But it does not mean anything.

For now, the WFS outputs are off. More work is needed to find what's wrong.


ELOG V3.1.3-