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Entry  Thu Feb 13 16:35:32 2020, anchal, DailyProgress, BEAT, BN Detector was saturated. Reduced laser powers. 
    Reply  Fri Feb 14 10:59:13 2020, anchal, DailyProgress, BEAT, Beatnote noise lowered in low frequency region 
       Reply  Mon Feb 17 16:08:23 2020, anchal, DailyProgress, BEAT, Beatnote noise lowered in low frequency region with ISS CTN_Noise_Budget_Effect_ISS_ON.pdf
          Reply  Fri Feb 21 16:22:04 2020, anchal, DailyProgress, BEAT, Beatnote noise lowered in low frequency region with ISS CTN_Noise_Budget_Effect_ISS_ON_New.pdf
             Reply  Tue Mar 3 10:02:12 2020, anchal, DailyProgress, BEAT, Lowest ever beatnote spectrum today! CTN_Noise_Budget_March03-2020.pdf
                Reply  Thu Mar 12 11:06:35 2020, anchal, DailyProgress, BEAT, Lowest ever beatnote spectrum today! CTN_Noise_Budget_March11-2020.pdf
                   Reply  Wed Mar 18 12:51:22 2020, anchal, DailyProgress, BEAT, Super beatnote measurement analysis results CTN_Beatnote_SuperMeasurement_March13-16.pdf
                      Reply  Mon Apr 13 16:52:30 2020, anchal, DailyProgress, BEAT, Beatnote measurements back on track CTN_Latest_BN_Spec.pdf
Message ID: 2543     Entry time: Fri Feb 21 16:22:04 2020     In reply to: 2540     Reply to this: 2548
Author: anchal 
Type: DailyProgress 
Category: BEAT 
Subject: Beatnote noise lowered in low frequency region with ISS 

After installing the new ISS, the noise is even lower in lower frequencies. Still no change in the noisy peaks at 400 Hz and around 800 Hz. There is also no difference in noise floor above 200 Hz.

Latest BN Spectrum: CTN_Latest_BN_Spec.pdf

Daily BN Spectrum: CTN_Daily_BN_Spec.pdf

Relevant elog post:

CTN: 2542: Installed New ISS on both paths using SR560s

Attachment 1: CTN_Noise_Budget_Effect_ISS_ON_New.pdf  154 kB  | Hide | Hide all
CTN_Noise_Budget_Effect_ISS_ON_New.pdf
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