Module and Diode Noise Power Spectrum and Correlations.

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Presentation transcript:

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 Removed bad diodes: module 4 U2 module 38 Q1 Module 40 Q1

FFT of Double Demodulated Diode Signals mV 2 /Hz versus freq(Hz) Scan Synchronous Signal Other glitches

TT-modules

FFT of Double Demodulated Diode Signals mV 2 /Hz versus freq(Hz) Scan Synchronous Signal Other glitches

Q1Q2 U1U2 Typical Fit Result to function P 1 /f + P 2 Typically cannot fit the first bin

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 (Q 1, Q 2, U 1, U 2 ) refer to average over all frequencies > 10 Hz

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

Q1-Q2, U1-U2, and Q-U correlation dependence on power difference between Leg A and Leg B Q1 - Q2 U1 - U2 Q – U

Correlation Dependence on Power Imbalance, and Hybrid Imperfection

Typical Diode-Diode Noise Correlation versus FrequencyC ij versus freq (Hz)

Bad Diode-Diode Noise Correlation versus Frequency from module 9 C ij versus freq (Hz)

Noise Correlation Between Diodes (within same module) * I haven’t checked, but this result seems to agree with study by I. Buder

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)