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Entry  Sat Dec 10 05:27:43 2011, kiwamu, Update, Green Locking, status update of the Y arm green lock 
    Reply  Sun Dec 11 17:28:36 2011, kiwamu, Update, Green Locking, status update of the Y arm green lock ALSscreens.png
Message ID: 6103     Entry time: Sun Dec 11 17:28:36 2011     In reply to: 6102
Author: kiwamu 
Type: Update 
Category: Green Locking 
Subject: status update of the Y arm green lock 

Quote from #6102

  + Recent goal : automation of the single arm green lock 

As reported in the previous elog entry #6102, the realtime model and screens have been modified.
Here is a summary about what are new in the realtime model.
(What are new ?)
  • The top name of the channels has been changed from GCV to ALS      
    => Although the model name itself is still C1GCV to keep the current relations between other computers.
  • I and Q signals on each sensor.
  • LOCKIN modules to detect the sign of the error signals by shaking suspensions.
  • Offset adjusters, which are combination of a controllable epics value and a low pass filter, to allow a smooth length scan.
  • Input matrix. This branches the input signal to the DOFs as well as the LOCKIN modules.
  • Output matrix to allow some combination of actuation (e.g. DARM, CARM, MCL, etc.,)
  • Output switch to enable/disable any feedbacks to the suspensions
  • Output filters before the suspensions. These filters will be usually flat, but enable us to inject some signals and enable some limiters.
    Here is the latest medm screen for the modified realtime controller.
    It gives you the idea of how the latest model works.


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