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 May 5 20:30:21 2018, Koji, Update, PSL, Modulation depth measurement for the 3IFO aLIGO EOM and aftermath 
    Reply  Sat May 5 22:32:07 2018, Koji, Update, PSL, Modulation depth measurement for the 3IFO aLIGO EOM  
    Reply  Tue May 15 10:42:14 2018, Koji, Update, PSL, Modulation depth measurement for the 3IFO aLIGO EOM and aftermath 
Message ID: 13819     Entry time: Sat May 5 22:32:07 2018     In reply to: 13818
Author: Koji 
Type: Update 
Category: PSL 
Subject: Modulation depth measurement for the 3IFO aLIGO EOM  

The 3IFO EOM was formerly tuned as the H2 EOM, so the resonant frequencies are different from the nominal aLIGO ones.

PORT1: 8.628MHz / 101 +/- 6 mrad_pk/V_pk
PORT2: 24.082MHz / 41.2 +/- 0.7 mrad_pk/V_pk
PORT3: 43.332MHz / 62.2 +/- 4 mrad_pk/V_pk

9MHz modulation is about x2.4 better than the one installed at LHO.
24MHz modulation is about x14 better. (This is OK as the new 24MHz is not configured to be resonant.)
45MHz modulation is about x1.4 better.
 

ELOG V3.1.3-