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Module and Diode Noise Power Spectrum and Correlations

This document details the analysis of W-band diode noise power spectrum and correlations, focusing on the B-glitch correction utilizing ADC anomaly information. Bad modules and diodes identified and excluded from the analysis are listed. The study presents FFT results of double demodulated diode signals, investigating synchronous signal glitches and their impact on noise correlation. Additionally, it includes frequency-dependent noise correlation results, correlation coefficient calculations, and future steps for further analysis and examination of glitch patterns in the FFT data.

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Module and Diode Noise Power Spectrum and Correlations

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  1. Module and DiodeNoise Power Spectrumand Correlations

  2. 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

  3. FFT of Double Demodulated Diode Signals mV2/Hz versus freq(Hz) Averaged over all Modules and Diodes Scan Synchronous Signal Other glitches

  4. TT-modules

  5. 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

  6. Typical Fit Result to function P1/f + P2 Typically cannot fit the first bin Q1 Q2 U1 U2

  7. 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

  8. From: Chicago Memo on Noise Correlations Assuming NO polarization at input DDmod Ideal Combination Correlation Coeff Q1 – Q2 0 U1 – U2 0 Q – U 0.5

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

  10. Correlation Dependence on Power Imbalance, and Hybrid Imperfection

  11. Cij versus freq (Hz) Typical Diode-Diode Noise Correlation versus Frequency

  12. Bad Diode-Diode Noise Correlation versus Frequency from module 9 Cij versus freq (Hz)

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

  14. 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)

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