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 Apr 2 18:24:34 2012, keiko, Update, LSC, RAM simulation for Full ifo 
    Reply  Tue Apr 3 01:52:15 2012, Zach, Update, LSC, RAM simulation for Full ifo 
       Reply  Tue Apr 3 14:11:33 2012, keiko, Update, LSC, RAM simulation for Full ifo 
    Reply  Tue Apr 3 14:17:18 2012, keiko, Update, LSC, RAM simulation for Full ifo flowchart.png
       Reply  Tue Apr 3 15:50:58 2012, keiko, Update, LSC, RAM simulation for Full ifo 
          Reply  Tue Apr 3 22:50:37 2012, keiko, Update, LSC, RAM simulation for Full ifo 
             Reply  Wed Apr 4 23:57:35 2012, keiko, Update, LSC, RAM simulation for Full ifo 
                Reply  Sat Apr 7 00:31:12 2012, keiko, Update, LSC, RAM simulation for Full ifo plot4a.pngplot4b.png
Message ID: 6475     Entry time: Mon Apr 2 18:24:34 2012     Reply to this: 6478   6481
Author: keiko 
Type: Update 
Category: LSC 
Subject: RAM simulation for Full ifo 

 I extended my RAM script from DRMI (3DoF) to the full IFO (5DoF).

Again, it calculates the operation point offsets for each DoF from the opt model with RAM. Then the position offsets are added to the model, and calculates the LSC matrix. RAM level is assumed as 0.1% of the PM modulation level, as usual, and lossless for a simple model.

 

 

Original matrix without RAM:

REFL f1 : 1.000000    0.000000    0.000008    -0.000005    0.000003 

  AS f2 : 0.000001    1.000000    0.000005    -0.003523    -0.000001 

 POP f1 : -3956.958708    -0.000183    1.000000    0.019064    0.000055 

 POP f2 : -32.766392    -0.154433    -0.072624    1.000000    0.024289 

 POP f2 : 922.415913    -0.006625    1.488912    0.042962    1.000000 

 

(MICH and SRCL uses the same sensor, with optimised demodulation phase for each DoF.) 

Operation position offsets are:

PRCL   -3.9125e-11 m

SRCL    9.1250e-12 m

CARM  5.0000e-15 m  

and no position offsets for DARM and MICH (because they are differential sensor and not affected by RAM offsets).

 

Resulting matrix with RAM + RAM offsets, normalised by the original matrix:  

REFL f1 : 0.001663    -0.000000    0.003519    0.000005    -0.000003 

  AS f2 : 0.000004    0.514424    0.000004    -0.001676    -0.000001 

 POP f1 : 7.140984    -0.001205    15.051807    0.019254    0.000417 

 POP f2 : 0.029112    -0.319792    0.042583    1.000460    0.024298 

 POP f2 : -0.310318    -0.014385    -1.761519    0.043005    0.999819 

 

As you can see in the second matrix, the CARM and DARM rows are completely destroyed by the RAM offsets! The signals are half reduced in the DARM case, so the mixture between DARM and MICH are about 50% degraded.

 I also would like to extend this script to use the DC readout, but don't know how to calculate the postion offset for AS_DC because the error signal is not zero-crossing for AS_DC anymore. Do you have any suggestions for me?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ELOG V3.1.3-