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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: 16108     Entry time: Mon May 3 09:14:01 2021     In reply to: 16101     Reply to this: 16112
Author: Anchal, Paco 
Type: Update 
Category: LSC 
Subject: IMC WFS noise contribution in arm cavity length noise 

Lock ARMs

  • Try IFO Configure ! Restore Y Arm (POY) and saw XARM lock, not YARM. Looks like YARM biases on ITMY and ETMY are not optimal, so we slide C1:SUS-ETMY_OFF from 3.0 --> -14.0 and watch Y catch its lock.
  • Run ASS scripts for both arms and get TRY/TRX ~ 0.95
    • We ran X, then Y and noted that TRX dropped to ~0.8 so we ran it again and it was well after that. From now on, we will do Y, then X.

WFS1 noise injection

  • Turn WFS limits off by running switchOffWFSlims.sh
  • Inject broadband noise (80-90 Hz band) of varying amplitudes from 100 - 100000 counts on C1:IOO-WFS1_PIT_EXC
  • After this we try to track its propagation through various channels, starting with
    • C1:LSC-XARM_IN1_DQ / C1:LSC-YARM_IN1_DQ
    • C1:SUS-ETMX_LSC_OUT_DQ / C1:SUS-ETMY_LSC_OUT_DQ
    • C1:IOO-MC_F_DQ
    • C1:SUS-MC1_**COIL_OUT / C1:SUS-MC2_**COIL_OUT / C1:SUS-MC3_**COIL_OUT
    • C1:IOO-WFS1_PIT_ERR / C1:IOO-WFS1_YAW_ERR
    • C1:IOO-WFS1_PIT_IN2

** denotes [UL, UR, LL, LR]; the output coils.

  • Attachment 1 shows the power spectra with IMC unlocked
  • Attachment 2 shows the power spectra with the ARMs (and IMC) locked
Attachment 1: WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf  43 kB  Uploaded Mon May 3 13:06:44 2021  | Hide | Hide all
WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdf
Attachment 2: WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf  46 kB  Uploaded Mon May 3 13:07:57 2021  | Hide | Hide all
WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf WFS1_PIT_Noise_Inj_Test_ARM_locked.pdf
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