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Message ID: 15247     Entry time: Wed Mar 4 11:16:37 2020
Author: gautam 
Type: Update 
Category: PSL 
Subject: PMC realignment 

I realigned the input pointing into the PMC this morning. Usually, the way I do this is to minimize any discernible mode structure in the PMC reflection CCD image. Today, I noticed that making the DC reflection go down also makes the DC transmission go down. Possibilities:

  • we are sampling slightly different spots inside the PMC cavity which change the buildup by ~2-3%.
  • we are misaligned on the transmission/reflection photodiode.
  • ??
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PMCrealignment.png
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