Diff for "How_To/Diagonalize_the_DRMI_Length_Control"

Differences between revisions 7 and 11 (spanning 4 versions)

Diagonalize the DRMI Length Control

This procedure describes how to measure and invert the input matrix for the 3x3 plant in the DRMI. This is necessary to prevent cross-coupling between the 3 control loops.

It's necessary to redo this procedure anytime there is fiddling with the Mach Zehnder or the Marconi signal generators that provide our modulation frequencies.

This procedure won't work on a solaris machine

This should be run while the DRM is locked & aligned

In the $SCRIPTS/LSC directory, run

setDDphases

This will servo the DD phases to zero, so there will be no offset at the operating point. After that script finishes, run

senseDRM

This will measure the plant, giving you info along the way and putting the results into some files. The last line of screen output should give you something like:

Your command to copy and paste into a terminal is:


tdswrite C1:LSC-ITMTRX_92 -1.1198 \
C1:LSC-ITMTRX_b2 2.8519 \
C1:LSC-ITMTRX_d2 -0.17059 \
C1:LSC-ITMTRX_f2 0.28573 \
C1:LSC-ITMTRX_122 -0.089699 \
C1:LSC-ITMTRX_142 -0.065893 \
C1:LSC-ITMTRX_95 0.30456 \
C1:LSC-ITMTRX_b5 -0.69205 \
C1:LSC-ITMTRX_d5 0.046096 \
C1:LSC-ITMTRX_f5 -0.074476 \
C1:LSC-ITMTRX_125 0.022033 \
C1:LSC-ITMTRX_145 0.0052107 \
C1:LSC-ITMTRX_93 -1.3128 \
C1:LSC-ITMTRX_b3 2.6644 \
C1:LSC-ITMTRX_d3 -1.5412 \
C1:LSC-ITMTRX_f3 -0.82075 \
C1:LSC-ITMTRX_123 -0.49044 \
C1:LSC-ITMTRX_143 0.070841 \
C1:LSC-ITMTRX_33 0 \
C1:LSC-ITMTRX_42 0 \
C1:LSC-ITMTRX_155 0

You can copy & paste this command into a terminal to load the new input matrix values.

How_To/Diagonalize_the_DRMI_Length_Control (last edited 2012-01-03 23:02:45 by localhost)

-  ⇤ ← Revision 7 as of 2009-08-20 05:29:36 → 
  Size: 1457
  Editor: RobertWard
  Comment:
+   ← Revision 11 as of 2009-11-24 01:23:08 → ⇥
  Size: 1709
  Editor: RobertWard
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 4:
+This procedure describes how to measure and invert the input matrix for the 3x3 plant in the DRMI.  This is necessary to prevent cross-coupling between the 3 control loops.  

It's necessary to redo this procedure anytime there is fiddling with the Mach Zehnder or the Marconi signal generators that provide our modulation frequencies.
-Line 6:
+Line 9:
-===== This should be run while the DRM is locked & aligned =====
+==== This procedure won't work on a solaris machine ====
==== This should be run while the DRM is locked & aligned ====
-Line 12:
+Line 17:
-This will servo the DD phases to zero, so there will be no offset at the operating point.
+This will servo the DD phases to zero, so there will be no offset at the operating point.  After that script finishes, run
-Line 17:
+Line 22:
-This will measure the plant, giving you info along the way and putting the results into some files.  The last line of screen output should give you a matlab command to run, such as

{{{ 
Use the matlab command: loadDRMImatrixData('DRMImatrix/DAT_090612-1244839443'); }}}

Run this matlab command, which will give you a tdswrite command:
+This will measure the plant, giving you info along the way and putting the results into some files.  The last line of screen output should give you something like: