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Entry  Thu Sep 5 16:59:36 2019, anchal, DailyProgress, BEAT, Beatnote Frequency long time series data BeatnoteLongTimeSeries.pdf
    Reply  Wed Oct 2 12:22:44 2019, anchal, DailyProgress, BEAT, Beatnote Frequency long time series data BeatnoteLongTimeSeries.pdf
       Reply  Tue Oct 8 16:48:07 2019, putInYourRealName, DailyProgress, BEAT, Beatnote Frequency long time series data 
          Reply  Wed Oct 9 16:08:39 2019, anchal, DailyProgress, BEAT, Beatnote Frequency long time series data BeatnoteLongTimeSeriesPart2.pdf
Message ID: 2449     Entry time: Wed Oct 9 16:08:39 2019     In reply to: 2448
Author: anchal 
Type: DailyProgress 
Category: BEAT 
Subject: Beatnote Frequency long time series data 

Whoever commented last, suggested a good idea. So I've here plotted the NPRO slow control voltage signals, converted into the inferred temperature of the cavities (see CTN:2415). I'm not so sure which CMRR the anonymous commentator is talking about. More clarification on that would be helpful.


Conclusions:

  • As the anonymous commentator said, the ideal temperature difference between the cavities would be around 20 uK, but that is clearly not the case as North Cavity varies more than 0.1 K while the South Cavity is relatively more stable.
  • This could also indicate that some external low-frequency noise source drifts the North Lasers frequency by corrupting the FSS.
  • The thermal dynamics of the two cavities should be similar unless same driven current causes starkly different emission of heat from the coil heaters (which are supposedly of same length).
  • Some more help in understanding these results are required, or atleast a person who can bounce back ideas with me.
  • So the can upgrade might be useful afterall. If anything, it will reduce the mysteries related to the cavities locked inside there for the last 5 years.

Code and Data

Attachment 1: BeatnoteLongTimeSeriesPart2.pdf  459 kB  Uploaded Wed Oct 9 17:11:28 2019  | Hide | Hide all
BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf BeatnoteLongTimeSeriesPart2.pdf
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