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HBD Transmission Monitor Update III: Noise Analysis

HBD Transmission Monitor Update III: Noise Analysis. B. Azmoun & S. Stoll BNL. HBD Working Group Meeting 10/10/06. Low Sensitivity at either end of Trans. plot. Signal consists of 3 Components: Background Noise Dark Current (DC) pe Signal. Low Sensitivity due to fluctuations

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HBD Transmission Monitor Update III: Noise Analysis

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  1. HBD Transmission Monitor Update III: Noise Analysis B. Azmoun & S. Stoll BNL HBD Working Group Meeting 10/10/06

  2. Low Sensitivity at either end of Trans. plot • Signal consists of 3 Components: • Background Noise • Dark Current (DC) • pe Signal Low Sensitivity due to fluctuations in the Bckgnd “Noise” Component B. Azmoun

  3. Sources of Error Error Dominated by Incorrect DC Subtraction Fluctuations and DC are small Compared to Signal in Central Region Error Dominated by Fluctuations in Noise B. Azmoun

  4. Scans of Noise, Dark Current and pe Current for each PMT of each Cell of Trans. Monitor

  5. CELL 1 Mon. PMT = PA0085Cell PMT = PA0089 B. Azmoun

  6. Noise & DC Spectra B. Azmoun

  7. CELL 2 Mon. PMT = PA0085Cell PMT = PA0088 B. Azmoun

  8. Noise & DC Spectra B. Azmoun

  9. CELL 3 Mon. PMT = PA0085Cell PMT = PA0086 B. Azmoun

  10. Noise & DC Spectra B. Azmoun

  11. Lab spectrometer Mon. PMT = PA0038Cell PMT = PA0080 B. Azmoun

  12. Noise & DC Spectra B. Azmoun

  13. Summary of Observations • The DC of both the “Monitor” and “Sample” are somewhat correlated • The Noise of both the “Monitor” and “Sample” are strongly correlated • The DC is ~const. (Const. offset) • The avg. fluctuations of both the DC scans and Noise scans are about the same Fluctuations are due to Noise, not the PMT itself (i.e., fluctuations in DC) B. Azmoun

  14. Sigma/Mean: Comparison of Lab Spectrometer to HBD Trans Mon. • Sigma/Mean of HBD Trans Monitor is similar to that of the Lab spectrometer, even • though the Lab spect. has about a factor of 10 - 20 less light…the larger fluctuations • in the HBD Trans. Monitor offset the increase in light output. B. Azmoun

  15. Long Duration Scans (DC & Signal) B. Azmoun

  16. Sigma B. Azmoun

  17. Noise & Dc Spectra Vs Time B. Azmoun

  18. Mean and Avg. Fluctuation Vs Time Even over a very long duration (~13hrs.) DC is ~Constant, while the fluctuations in the Monitor and Sample Scans remain Strongly Correlated B. Azmoun

  19. To Do … • Investigate Noise Issues • Lab Noise is a problem in general • What is different between Lab Spect. and HBD Trans monitor • Flow CF4 and check compatibility with Al collimation tube (coated with black layer of ???) B. Azmoun

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