1 / 15

Module and Diode Noise Power Spectrum and Correlations

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

taniel
Download Presentation

Module and Diode Noise Power Spectrum and Correlations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related