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Entry  Thu Nov 10 16:44:54 2011, Mirko, Update, Adaptive Filtering, Looking into MC_F & PSL misalignment 10112011076.jpg10112011073.jpg
    Reply  Thu Nov 10 22:00:38 2011, Mirko, Update, Adaptive Filtering, Looking into MC_F & PSL misalignment 6x
Message ID: 5864     Entry time: Thu Nov 10 16:44:54 2011     Reply to this: 5867
Author: Mirko 
Type: Update 
Category: Adaptive Filtering 
Subject: Looking into MC_F & PSL misalignment 

 [Den, Mirko]

While doing the things below we accidentally misaligned the PSL laser. Thanks to Suresh and Jenne for realigning!!

There are a lot of strange features in MC_F (see for example http://nodus.ligo.caltech.edu:8080/40m/5738 )
To get some better understanding of the signals in the control loop we looked some more into what happens to the MC feedback signal after it exits the MC servo board (D040180 see DCC).

10112011076.jpg
The MC_F signal is actually the servo signal: http://nodus.ligo.caltech.edu:8080/40m/5695
The Thorlabs temperature controller is actually used in the PZT path!

 We measured the LP filter in the PZT path (that is kind of mislabeled as temp.)

10112011073.jpg

 

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