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 Feb 6 11:59:12 2013, Jenne, Update, Locking, PRC cavity gains 
    Reply  Wed Feb 6 18:39:08 2013, Jenne, Update, Locking, PRC cavity gains 
       Reply  Wed Feb 6 19:59:35 2013, rana, Update, Locking, PRC cavity gains 
          Reply  Wed Feb 6 20:03:50 2013, Manasa, Update, Locking, PRC cavity gains 
       Reply  Wed Feb 13 14:21:19 2013, Jenne, Update, Locking, PRC cavity gains 
Message ID: 8007     Entry time: Wed Feb 6 11:59:12 2013     Reply to this: 8014
Author: Jenne 
Type: Update 
Category: Locking 
Subject: PRC cavity gains 

EDIT:  These numbers are for a perfect, non-lossy arm cavity.  So, a half real, half imaginary world.

Carrier uses arm cavity reflectivity for perfectly resonant case.

PRC carrier gain, flipped PR2, PR3 = 61

PRC carrier gain, regular PR2, PR3 = 68  (same value, within errors, for no folding at all).

Carrier gain loss = (68-61)/68 = 10%

 

SB uses arm cavity reflectivity for perfectly anti-resonant case.

PRC SB gain, flipped PR2, PR3 = 21

PRC SB gain, regular PR2, PR3 = 22 (same value, within errors, for no folding at all). <--- yes, this this "regular PR2, PR3 = 22..."

SB % gain loss = (22-21)/22 = 4.5%

 

I claim that we will be fine, recycling gain-wise, if we flip the folding mirrors.  If we do as Yuta suggests and flip only one folding mirror, we'll fall somewhere in the middle.

ELOG V3.1.3-