Diff for "How_To/Diagonalize_the_DRMI_Length_Control"

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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 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 1 as of 2009-06-12 21:22:59 → 
  Size: 290
  Editor: RobertWard
  Comment:
+   ← Revision 10 as of 2009-08-20 15:43:19 → ⇥
  Size: 1651
  Editor: RobertWard
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-Diagonalize the DRMI Length Control
+## page was renamed from Diagonalize the DRMI Length Control
== 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 should be run while the DRM is locked & aligned =====
-Line 4:
+Line 12:
+{{{
setDDphases }}}

This will servo the DD phases to zero, so there will be no offset at the operating point.  After that script finishes, run
-Line 8:
+Line 20:
-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
+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:
-Line 11:
+Line 26:
+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 }}}
-Line 12:
+Line 48:
+You can copy & paste this command into a terminal to load the new input matrix values.