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Entry  Wed Mar 6 18:14:33 2013, Manasa, Summary, LSC, Calibration of BS, ITMX and ITMY actuators MICHerrCalibration.pngMICHerrCalibration.pngMICHOLTF.pngactcalibITMBS.png
    Reply  Thu Mar 7 01:43:35 2013, yuta, Update, LSC, calibrated MI differential length spectra LSCMICHOLTF_MI.pngMImotion.png
    Reply  Fri Mar 8 02:17:04 2013, yuta, Update, LSC, calibration of PRM actuator calibREFL55Q.pngactcalibPRM.pngOLTF_PRCL.png
       Reply  Fri Mar 8 03:07:19 2013, yuta, Update, LSC, calibrated PRM-ITMY length spectra LSCPRCLOLTF_PRITMY.pngPRITMYmotion.png
Message ID: 8256     Entry time: Fri Mar 8 03:07:19 2013     In reply to: 8255
Author: yuta 
Type: Update 
Category: LSC 
Subject: calibrated PRM-ITMY length spectra 

Measured free swing PRM-ITMY length was 230 nm RMS.
MI differential length was 85 nm RMS(elog #8248). This tells you that PR2, PR3 are not so noisy compared with usual suspensions.

Openloop transfer function:
  OLTF of PRM-ITMY cavity lock using REFL55_Q_ERR as error signal and PRM as actuator is below.
  UGF ~ 120 Hz, phase margin ~ 50 deg.
  Somehow, phase delay was 460 usec, which is smaller than the empirical value 550 usec.
LSCPRCLOLTF_PRITMY.png


PRM-ITMY length spectra:
  Below. Calibration was done using calibrated REFL55_Q_ERR and actuator response(elog #8255).
PRITMYmotion.png

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