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Entry  Wed Jul 9 21:05:31 2014, manasa, Update, General, AOM and PSL Ringdown  data_code.zipPSL_ringFit.pdfAOMringFit.pdf
    Reply  Thu Jul 10 00:38:20 2014, manasa, Update, General, AOM and PSL Ringdown  
Message ID: 10171     Entry time: Thu Jul 10 00:38:20 2014     In reply to: 10168
Author: manasa 
Type: Update 
Category: General 
Subject: AOM and PSL Ringdown  


RXA: some more comments...

  1. The fact that the AOM can only modulate the power by a tiny bit means that it is very mis-aligned or that the driver is broken.
  2. You need to take into account the AOM step time in the calculation of the PMC step time. Its not a step response if the input step is not a step, but a exponential.
  3. I wouldn't trust that old John Miller entry for the PMC Finesse. As you can see from his elog, even he didn't trust it.
  4. As we were discussing before, making a little step is not the same as a full ringdown. cf. G000413 and T900007


I think we should revisit the AOM alignment because the last time it was aligned, PMC trans dropped from 0.84 to 0.15 (a little more than 80%) for 0-1V modulation input to the AOM driver [elog]. The drop in power right now is ~10-15% only.

I could not find any elogs of AOM alignment touchups after Oct 2012.
But can the ISS team throw some light on the status of AOM when they were installing the ISS servo before we decide on touching the AOM alignment? [elog

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