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  Fri May 21 11:56:34 2010, Alberto, Update, 40m Upgrading, 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. 7x
    Reply  Fri May 21 16:24:11 2010, Koji, Update, LSC, 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. 
    Reply  Mon May 24 10:03:14 2010, rana, Update, LSC, 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. 
       Reply  Mon May 24 11:32:05 2010, rana, Update, LSC, 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. reflRFpowerVsArmLength.png
Message ID: 2973     Entry time: Mon May 24 10:03:14 2010     In reply to: 2966     Reply to this: 2974
Author: rana 
Type: Update 
Category: LSC 
Subject: 40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. 

 

 If you have a working 40m Optickle model, put it in a common place in the SVN, not in your own folder.

I can't figure out why changing the arm length would effect the RF sidebands levels. If you are getting RF sidebands resonating in the arms, then some parameter is not set correctly.

As the RF sideband frequency gets closer to resonating in the arm, the CARM/DARM cross-coupling to the short DOFs probably gets bigger.

ELOG V3.1.3-