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 May 7 12:57:34 2012, Den, Update, IOO, WFS noise in MC gur_suspos_coh.pngmc1_gur.pngmcl_wfs.pngwfs_servo.png
    Reply  Mon May 7 17:28:29 2012, Den, Update, IOO, WFS noise in MC wfs_limit.png
       Reply  Mon May 7 19:39:52 2012, Koji, Update, IOO, WFS noise in MC 
          Reply  Mon May 7 20:15:37 2012, Den, Update, IOO, WFS noise in MC 
Message ID: 6613     Entry time: Mon May 7 17:28:29 2012     In reply to: 6612     Reply to this: 6614
Author: Den 
Type: Update 
Category: IOO 
Subject: WFS noise in MC 


One filter bank adds noise to WFS signals and because of that we loose coherence between MC_F and seismic motion.

 This effect is due to C1:IOO-WFS1_PIT_LIMIT=2000. When I turned if off, coherence between C1:IOO-WFS_PIT input and output signals restored


The other thing is that WFS actuate on the angular motion, but this couples to the position motion. We need to diagonalize the actuator.

ELOG V3.1.3-