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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: 6482     Entry time: Tue Apr 3 15:50:58 2012     In reply to: 6481     Reply to this: 6483
Author: keiko 
Type: Update 
Category: LSC 
Subject: RAM simulation for Full ifo 

Oops, Yesterday's results for DARM was wrong!

I got more convincing results now. 

 

> (B) Are pos-offsets degrade the CARM and DARM so much (See, the quoted result below), is that true? 

 

Here is the new results. It does change CARM a lot, but not DARM:
 
Matrix1 (normalised so that the diagonals are 1):
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 
(=Matrix 2)
 
Position offsets:
only CARM, 4.6e-16 (this number changed because I increased the resolution of the calculation)
 
Matrix3 (normalised by matrix 1):
REFL f1 : 0.039780    -0.000000    0.003656    0.000005    -0.000003 
  AS f2  : 0.000008    1.000017    0.000005    -0.003499    -0.000001 
 POP f1 : 159.146819    -0.000138    15.605155    0.019393    0.000055 
 POP f2 : 1.277223    -0.154415    0.047344    1.000008    0.024289 
 POP f2 : -35.422498    -0.006633    -1.886454    0.042963    1.000000 

 

  • CARM got a small position offset which degrades CARM signal 2 orders of mag (still the biggest signal in the sensor, though).
  • DARM was not so bad, and probably the change of the DoF mixture is mostly not changed.
  • Matrices don't change only with 1e-4 RAM. It changes with position offsets.
  • I'll see how the matrix changes without position offsets but only with RAM effects, changing RAM levels.
  • Again, above is C1 configuration, 1e-4 RAM level of PM level.

 

 

Quote:

I add a flow-chart drawing what the scripts do and how the scripts calculate the LSC matrix.

flowchart.png

 

(1) First, you calculate the LSC matrix WITHOUT RAM or anything, just for a reference. This is the first matrix shown in the quoted post.

(2) The script calculates the LSC matrix with RAM. Also, the PDH signals for all 5 DoF are calculated. The PDH signals have offsets due to the RAM effect. The operating position offsets are saved for the next round.

(3) The script calculates the LSC matrix again, with RAM plus the offset of the operation points. The matrix is shown in the last part of the quoted post.

 

Now I am going to check (A) LSC matrices (matrix 2, the second matrix of above chart) with different RAM levels (B) Are pos-offsets degrade the CARM and DARM so much (See, the quated result below), is that true? 

 

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