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Message ID: 9880     Entry time: Wed Apr 30 16:07:59 2014
Author: manasa 
Type: Update 
Category: LSC 
Subject: ALS X noise post servo modification 

I. The Y arm stayed stable through last night and I have saved the arm lock settings to IFOconfigure.

II. ALS X arm noise measurements

I looked at the before and after noise of ALSX.

Phase tracker gain = 85
Xarm servo gain = -17

The rms in loop noise has dropped from 3KHz to 500 Hz.

Attachment 1: Phase tracker OLTF

Attachment 2: Free running noise and in loop noise

Attachment 3: Out of loop noise (measured with arms locked using PDH for IR)

Attachment 4: ALS arm servo OLTF

xml data files can be found in /users/manasa/data/140430/

Attachment 1: ALSX_PToltf.jpg  94 kB  | Hide | Hide all
Attachment 2: ALSX_FreeInloop.jpg  84 kB  | Hide | Hide all
Attachment 3: ALSX_ool.jpg  82 kB  | Hide | Hide all
Attachment 4: ALSX_OLTF.jpg  76 kB  | Hide | Hide all
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