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===== This should be run while the DRM is locked & aligned, and after the double demod demod phases have been set so that the offsets are zero ===== ===== This should be run while the DRM is locked & aligned =====
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{{{
setDDphases }}}

This will servo the DD phases to zero, so there will be no offset at the operating point.

Diagonalize the DRMI Length Control


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.

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 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:

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)