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Message ID: 6140     Entry time: Wed Dec 21 03:38:14 2011
Author: kiwamu 
Type: Update 
Category: Green Locking 
Subject: Y arm ALS : automation script 80 % done 

Scripting of the single arm automated lock script is 80% done.

The remaining 20 % is not something immediately needed and I start decreasing the priority on the Y arm ALS.

(Remaining stuff)

  • Automated optimization of I/Q phases at the frequency discriminator's signal.
    • this part will be done after we install Jamie's new beat box
  • A routine function which checks if the beat note is within a reasonable bandwidth
    • This part can be done with the frequency-divided signal and the digital delay line frequency discriminator
    • Another approach is to install a frequency counter, which doesn't have to be so precise
  • A state bit which tells us how far the script goes
  • An exit handler.
    • This should run whenever the script is unexpectedly force-quite, to gently bring the ALS system down.
  • A servo which brings the beat frequency to exactly a point where the infrared light is on a resonance point
    • Currently this part is partially human-aided. I put a little bit of correction in the frequency offset by looking at time series
    • To automate this part, we need another LOCKIN system to shake the arm length and demodulates the transmitted light
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