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Message ID: 14151     Entry time: Thu Aug 9 22:50:13 2018
Author: gautam 
Type: Update 
Category: CDS 
Subject: AlignSoft script modified 

After this work of increasing the series resistance on ETMX, there have been numerous occassions where the insufficient misalignment of ETMX has caused problems in locking vertex cavities. Today, I modified the script (located at /opt/rtcds/caltech/c1/medm/MISC/ifoalign/AlignSoft.py) to avoid such problems. The way the misalign script works is to write an offset value to the "TO_COIL" filter bank (accessed via "Output Filters" button on the Suspension master MEDM screen - not the most intuitive place to put an offset but okay). So I just increased the value of this offset from 250 counts to 2500 counts (for ETMX only). I checked that the script works, now when both ETMs are misaligned, the AS55Q signal shows a clean Michelson-like sine wave as it fringes instead of having the arm cavity PDH fringes as well yes.

Note that the svn doesn't seem to work on the newly upgraded SL7 machines: svn status gives me the following output.

svn: E155036: Please see the 'svn upgrade' command
svn: E155036: Working copy '/cvs/cds/rtcds/userapps/trunk/cds/c1/medm/MISC/ifoalign' is too old (format 10, created by Subversion 1.6)

 Is it safe to run 'svn upgrade'? Or is it time to migrate to git.ligo.org/40m/scripts?

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