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Entry  Mon Aug 17 02:05:49 2009, Yoichi,rana, Update, PSL, Reference cavity reflection looks bad P8170113.JPGUntitled.png
    Reply  Mon Aug 17 04:16:13 2009, Yoichi, Update, PSL, Reference cavity reflection looks bad 
Message ID: 1917     Entry time: Mon Aug 17 04:16:13 2009     In reply to: 1915
Author: Yoichi 
Type: Update 
Category: PSL 
Subject: Reference cavity reflection looks bad 

Quote:
Rana, Yoichi
- We also moved the Refcav reflection camera to look at the leakage through a reflection steering mirror so that there's less chance of distortion. There was previously a W1 window in there as a pickofff. Also changed the camera to autogain so that we can see something.

- Re-aligned onto the refl pd.

- Tweaked alignment into RC. Mainly in yaw. Transmission went from 5V to 7V. In your face, Aso!


After our removal of the pick off window and Rana's re-alignment of the beam into the RC, the RC optical gain increased.
FSS was complaining about it by driving the PC feedback crazy.
I reduced the nominal common gain from 12.5dB to 11dB.
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