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
 List  |  Find  |  Login  |  Help 
Entry  Wed Nov 16 17:40:48 2011, Mirko, Update, IOO, MC unlocked and misaligned. 
    Reply  Wed Nov 16 18:14:09 2011, Koji, Update, IOO, MC unlocked and misaligned. 
       Reply  Wed Nov 16 20:30:27 2011, not Koji, Update, IOO, MC unlocked and misaligned. 
          Reply  Thu Nov 17 13:58:12 2011, Suresh, Update, IOO, MC unlocked and misaligned. 
Message ID: 5917     Entry time: Wed Nov 16 20:30:27 2011     In reply to: 5916     Reply to this: 5925
Author: not Koji 
Type: Update 
Category: IOO 
Subject: MC unlocked and misaligned. 

Quote:

Actually, do we need to reset the filter history at every lock loss of the MC?

Those DC offsets were necessary to keep the alignment good just until the MC is unlocked.
So if we keep the history, we can maintain the good alignment.

 I suspect the integrators get fed a huge wrong signal on lockloss. Clearing the history on the trans DOFs when the MC was badly aligned gets it nicely aligned again. I switched off the alignment transmission DOFs for now.

ELOG V3.1.3-