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Entry  Tue Feb 18 23:55:33 2014, Jenne, Update, LSC, ALS locked with LSC! 
    Reply  Wed Feb 19 00:35:23 2014, Koji, Update, LSC, ALS locked with LSC! 
       Reply  Wed Feb 19 01:33:03 2014, Jenne, Update, LSC, ALS locked with LSC! ALS_XARM_LockingFilters.pdfALSvsLSC_AllLockingFilters.pdfLSC_XARM_LockingFilters.pdf
          Reply  Wed Feb 19 03:07:22 2014, Jenne, Update, LSC, ALS locked with LSC! 
Message ID: 9649     Entry time: Tue Feb 18 23:55:33 2014     Reply to this: 9650
Author: Jenne 
Type: Update 
Category: LSC 
Subject: ALS locked with LSC! 

I'm really excited, so I'm posting this, even though I'm still working:

I currently have ALS locked using the LSC system, and have (by hand, coarsely) found IR resonance!  Hooray!

I looked at my error signals, as well as LSC-XARM_IN1 with dataviewer, and noticed that the XARM_IN1 signal was crazy when I was using the ALS signal as the error.  I soon realized that this is because there was a non-zero element in the power normalization matrix, and I'm overriding the trigger.  So, I was trying to divide by zero, and was getting crazy numbers.  After zeroing the power normalization matrix element for the Xarm, the XARM_IN1 signal matched the ALSX_OUT, and I was easily able to acquire lock.

I had already re-transferred over the ALS versions of the filters, so that's what I'm using right now.  Next up (on a 5 minute time-scale) is trying to acquire lock using the regular LSC filters. 

Oh, also, something I hadn't thought of before dinner:  I am setting the offset of the ALSX filter bank such that the output is centered around zero, so that I can lock, since these are not AC coupled servos.

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