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Entry  Thu Apr 29 11:51:27 2021, Anchal, Summary, LSC, Start of measuring IMC WFS noise contribution in ar cavity length noise 
    Reply  Thu Apr 29 15:11:33 2021, gautam, Update, CDS, RFM  RFM_errs.pngScreenshot_2021-04-29_15-12-56.png
       Reply  Thu Apr 29 17:43:16 2021, Koji, Update, CDS, RFM  
       Reply  Thu Apr 29 17:43:48 2021, Anchal, Update, CDS, F2A Filters double check F2AFiltersON.png
          Reply  Fri Apr 30 00:20:30 2021, gautam, Update, CDS, F2A Filters double check 
    Reply  Thu Apr 29 17:51:19 2021, Anchal, Summary, LSC, Start of measuring IMC WFS noise contribution in arm cavity length noise WFS1_PIT_exc_80-100Hz_Arms_ASD.pdf
       Reply  Fri Apr 30 00:18:40 2021, gautam, Summary, LSC, Start of measuring IMC WFS noise contribution in arm cavity length noise 
       Reply  Mon May 3 09:14:01 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdfWFS1_PIT_Noise_Inj_Test_ARM_locked.pdf
          Reply  Mon May 3 17:28:58 2021, Anchal, Paco, Rana, Update, LSC, IMC WFS noise contribution in arm cavity length noise excitationoftheMCanglessothatwecanseesomethingdotpng.pngexcitationoftheMCanglessothatwecanseesomethingdotpngbutthistimeitsMC2.png
             Reply  Tue May 4 11:43:09 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise ArmCavNoiseContributions.pdfIOO-MC1_PIT_NoiseInjTest2.pdfIOO-MC1_PIT_NoiseInjTest_AWGGUI_Config.png
                Reply  Fri May 7 11:54:02 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise ITMX-XARM_TF.pdfITMY-YARM_TF.pdfArmCavNoiseContributions.pdf
                   Reply  Mon May 10 18:19:12 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise, Corrections ArmCavNoiseContributions.pdf
                      Reply  Wed May 12 10:53:20 2021, Anchal, Paco, Update, LSC, PSL-IMC PDH Loop and XARM PDH Loop diagram IMC_SingleArm.pdf
Message ID: 16112     Entry time: Mon May 3 17:28:58 2021     In reply to: 16108     Reply to this: 16117
Author: Anchal, Paco, Rana 
Type: Update 
Category: LSC 
Subject: IMC WFS noise contribution in arm cavity length noise 

Rana came and helped us figure us where to inject the noise. Following are the characteristics of the test we did:

  • Inject normal noise at C1:IOO-MC1_PIT_EXC using AWGGUI.
  • Excitation amplitude of 54321 in band 12-37Hz with Cheby1 8th order bandpass filter with same limits.
  • Look at power spectrum of C1:IOO-MC_F_DQ, C1:IOO-WFS1-PIT_OUT_DQ and the C1:IOO-MC1_PIT_EXC itself.
  • Increased the gain of the noise excitation until we see some effect in MC_F.
  • Diaggui also showed coherence plot in the bottom, which let's us have an estimate of how much we need to go further.

Attachment 1 shows a screenshot with awggui and diaggui screens displaying the signal in both angular and longitudinal channels.

Attachment 2 shows the analogous screenshot for MC2.

 

Attachment 1: excitationoftheMCanglessothatwecanseesomethingdotpng.png  589 kB  Uploaded Mon May 3 18:35:36 2021  | Hide | Hide all
excitationoftheMCanglessothatwecanseesomethingdotpng.png
Attachment 2: excitationoftheMCanglessothatwecanseesomethingdotpngbutthistimeitsMC2.png  923 kB  Uploaded Mon May 3 19:37:43 2021  | Hide | Hide all
excitationoftheMCanglessothatwecanseesomethingdotpngbutthistimeitsMC2.png
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