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Entry  Mon Jun 3 18:49:44 2013, Gautam, Update, General, ITMx Oplev Fixed  
    Reply  Wed Jun 5 20:45:19 2013, gautam, Update, General, ITMx Oplev Fixed  ITMx_overview.JPGITMx_clipping_.JPG
       Reply  Wed Jun 26 19:02:38 2013, gautam, Update, General, ITMx Oplev (not quite?) Fixed oplev_chamber.pdfphoto_1.JPGphoto_2.JPG
          Reply  Thu Jun 27 18:11:53 2013, gautam, Update, General, ITMx Oplev-POX looks beam okay 
             Reply  Thu Jun 27 23:01:39 2013, gautam, Update, General, ITMx Oplev-servo gains adjusted pitch-plot.pdfyaw-plot.pdf
                Reply  Fri Jun 28 13:10:28 2013, gautam, Update, General, ITMx Oplev-servo gains adjusted pitch-plot_copy.pdfyaw-plot_copy.pdf
Message ID: 8777     Entry time: Thu Jun 27 23:01:39 2013     In reply to: 8770     Reply to this: 8784
Author: gautam 
Type: Update 
Category: General 
Subject: ITMx Oplev-servo gains adjusted 

 

 With rana's input, I changed the ITMx oplev servo gains given the beam path had been changed. The pitch gain was changed from 36 to 30, while the yaw gain was changed from -25 to -40. Transfer function plots attached. The UGF is ~8Hz for pitch and ~7Hz for yaw.

I had to change the envelope amplitudes in the templates for both pitch and yaw to improve the coherence. Above 3Hz, I multiplied the template presets by 10, and below 3Hz, I multiplied these by 25.

 

pitch-plot.pdf

 

yaw-plot.pdf

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