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Entry  Tue May 20 02:12:35 2014, Jenne, Update, LSC, ALS X noise investigation ALS_outofloop_19May2013.pdfXbeatSaturate.png
    Reply  Wed May 21 13:20:34 2014, manasa, Update, LSC, ALS X noise from angular motion of mirrors ALSX_OLYerrITM.png
       Reply  Thu May 22 00:30:40 2014, manasa, Update, LSC, ALS X noise from angular motion of mirrors ALSX_OLPerrITM2.pngALSX_OLYerrITM.pngALSX_OLPerrETM.pngALSX_OLYerrETM2.png
Message ID: 9988     Entry time: Thu May 22 00:30:40 2014     In reply to: 9983
Author: manasa 
Type: Update 
Category: LSC 
Subject: ALS X noise from angular motion of mirrors 

Below are the transfer functions measured between the angular (pit, yaw) motion of X arm mirrors and the ALSX error signal. The measurements were again made for 1Hz-30Hz.

The transfer functions are mostly flat.

ITMX P - 200-300 Hz/urad (beat freq = 45 MHz)

ITMX Y - 700-800 Hz/urad (beat freq = 27MHz)

ETMX P - 500-600 Hz/urad (beat freq = 56 MHz)

ETMX Y - 1000-2000 Hz/urad (beat freq = 62.5MHz)

Data xml files can be found in /users/manasa/data/140521/

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