module and diode noise power spectrum and correlations
DESCRIPTION
Module and Diode Noise Power Spectrum and Correlations. Cuts Data from W-band CES #3 Run ID# 3010 B-glitch correction using adc_anomaly_info.txt -w91-multi-v3.txt (default diode rms = 0.2 counts) Not looking at TT modules (modules 85-90) Removed bad modules: 7, 8, 28, 42, 81 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/1.jpg)
Module and DiodeNoise Power Spectrum
and Correlations
![Page 2: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/2.jpg)
Cuts
Data from W-band CES #3 Run ID# 3010
B-glitch correction using adc_anomaly_info.txt-w91-multi-v3.txt(default diode rms = 0.2 counts)
Not looking at TT modules (modules 85-90)
Removed bad modules:
7, 8, 28, 42, 81
Removed bad diodes:
module 4 U2module 38 Q1Module 40 Q1
![Page 3: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/3.jpg)
FFT of Double Demodulated Diode Signals
mV2/Hz versus freq(Hz)
Averaged over all Modules and Diodes
Scan Synchronous Signal
Other glitches
![Page 4: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/4.jpg)
TT-modules
![Page 5: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/5.jpg)
FFT of Double Demodulated Diode Signals
mV2/Hz versus freq(Hz)
Some Modules show Stronger Glitch Signals(could be ground pickup)
Scan Synchronous Signal
Other glitches
![Page 6: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/6.jpg)
Q1 Q2
U1 U2
Typical Fit Result to function P1/f + P2 Typically cannot fit the first bin
![Page 7: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/7.jpg)
![Page 8: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/8.jpg)
Definition of White Noise Correlation (from I. Buder)
F are the frequency components from the FFT
F-bar denote complex conjugate of F
i,j are diode indices (Q1, Q2, U1, U2)
< > refer to average over all frequencies > 10 Hz
![Page 9: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/9.jpg)
DDmod Ideal Combination Correlation Coeff
Q1 – Q2 0
U1 – U2 0
Q – U 0.5
From: Chicago Memo on Noise Correlations
Assuming NO polarization at input
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Q1-Q2, U1-U2, and Q-U correlation dependence on power difference between Leg A and Leg B
Q1 - Q2U1 - U2
Q – U
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Correlation Dependence on Power Imbalance, and Hybrid Imperfection
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Typical Diode-Diode Noise Correlation versus FrequencyCij versus freq (Hz)
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Bad Diode-Diode Noise Correlation versus Frequency from module 9Cij versus freq (Hz)
![Page 14: Module and Diode Noise Power Spectrum and Correlations](https://reader035.vdocument.in/reader035/viewer/2022062501/5681677f550346895ddc88d4/html5/thumbnails/14.jpg)
Noise Correlation Between Diodes (within same module)
* I haven’t checked, but this result seems to agree with study by I. Buder
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What next ?
Implement B-glitching correction (done)
Analyze 91 modules from one CES (done)
Write fitter to fit for 1/f knee and white noise level (done)
Write fitter to fit for correlation coefficients (done)
Analyze more CES
Examine Glitch patterns in FFT (may be due SSS)