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SUS Lab eLog |
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Thu Feb 13 00:25:36 2020, Duo, DailyProgress, , Noisemon at L1 
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Wed Mar 11 12:46:20 2020, rana, Computing, Noise Budget, Noisemon at L1
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Sat Apr 18 16:21:32 2020, Duo, Computing, Noise Budget, Noisemon:DAC noise analysis from L1 and H1  
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Mon Apr 20 22:56:30 2020, rana, DailyProgress, Noise Budget, Noisemon:DAC noise analysis from L1 and H1 
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Message ID: 1850
Entry time: Mon Apr 20 22:56:30 2020
In reply to: 1849
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Author: |
rana |
Type: |
DailyProgress |
Category: |
Noise Budget |
Subject: |
Noisemon:DAC noise analysis from L1 and H1 |
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for some reason the DAC noise estimate is too high, it can't really be so large compared to the real DARM curve (see the noise budget curves from LLO - there are other noise sources besides DAC noise)
some possibilities:
- maybe the DAC noise calibration into meters is wrong? I can't tell from the code where this came from. It would be good to put a comment in there.
- perhaps most of this noise is actually angular noise. The ASC control signals are adjusted by tuning the digital coefficients (before MASTER_OUT) so that the angle to length coupling is minimized. I think something like this has to be done to remove the angular noise from the DAC noise estimate.
- internal saturation of the DAC noise monitor?
I hve modified the code to plot nicer and also to remove some divide by zero problems. There is also still some warnings about other divide by zero - those should probably be fixed by examining how better to handle it when the coherence goes to zero. |
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Attachment 2: |
dacNB.zip
21.454 MB
Uploaded Tue Apr 21 00:08:10 2020
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