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Entry  Fri Feb 24 03:58:13 2012, kiwamu, Update, LSC, Y arm + PRMI part II 
    Reply  Fri Feb 24 15:01:31 2012, kiwamu, Update, LSC, Y arm + PRMI part II time_series.png
       Reply  Fri Feb 24 19:18:28 2012, kiwamu, Update, LSC, Y arm + PRMI : how they should look like expected_time_series.png
    Reply  Fri Feb 24 18:37:13 2012, rana, Update, LSC, Y arm + PRMI part II 
Message ID: 6317     Entry time: Fri Feb 24 19:18:28 2012     In reply to: 6313
Author: kiwamu 
Type: Update 
Category: LSC 
Subject: Y arm + PRMI : how they should look like 

I calculated how the DC signals should look like in the Y arm PRMI configuration.

The expected signals are overlaid in the same plot as that of shown in #6313.

You can see there are disagreements between the observed and expected signals in the plot below at around the time when the arm is brought to the resonance.

 

(expected behaviors)

  •  TRY: At the end it should be at 1 (remember TRY is normarlized) and should not go more than that, since the power-recycling is in a weird situation and it is not fully recycling the power.
  •  ASDC: It should become brighter at the end because the arm cavity flips the sign of the reflected light and hence the dark port must be on a bright fringe.
  •  REFLDC: It will decrease a little bit because the arm cavity and MICH try to suck some amount of the power into the interferometer.

 

expected_time_series.png

Quote from #6313

The figure below shows the time series of the Y arm + PRMI trail.

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