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Count-Rate Statistics for Drift Detectors.

Philip J Pietraski1, Lars R Furenlid2

  • 1National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973 USA. He is now with InterDigital Communications Corporation, Melville, NY 11747 USA.

IEEE Transactions on Nuclear Science
|April 23, 2016
PubMed
Summary
This summary is machine-generated.

Synchrotron X-ray sources are pulsed, affecting photon-counting detector pileup statistics. This study analyzes pileup for drift detectors under various pulsed conditions, crucial for synchrotron experiments.

Keywords:
Drift detectorshigh count-rate detectorspile-up statistics

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Area of Science:

  • X-ray physics
  • Detector technology
  • Synchrotron radiation

Background:

  • Synchrotron light sources provide pulsed X-ray beams, a characteristic often overlooked in detector performance assessments.
  • Photon-counting detectors are vital for synchrotron-based experiments, but their count-rate capabilities can be impacted by source properties.
  • Pileup, where multiple X-ray photons are registered as a single event, is a key factor affecting detector accuracy.

Purpose of the Study:

  • To investigate the impact of pulsed synchrotron X-ray sources on the pileup statistics of drift detectors.
  • To develop theoretical expressions for pileup under different pulsed source conditions relevant to synchrotron operations.

Main Methods:

  • Derivation of pileup statistics expressions for both continuous and pulsed X-ray sources.
  • Analysis of pileup for pulsed sources with periods significantly shorter than detector response times (shaper support, drift time).
  • Examination of pileup for pulsed sources with periods comparable to or longer than detector response times, simulating different synchrotron bunch patterns.

Main Results:

  • Demonstrated the significant effect of pulsed X-ray source duty cycles on drift detector pileup.
  • Provided distinct pileup expressions tailored to different relationships between the X-ray pulse period and detector timing parameters.
  • Quantified pileup variations corresponding to normal and reduced synchrotron bunch fill patterns.

Conclusions:

  • Accurate estimation of photon-counting detector count-rate capabilities in synchrotron experiments requires accounting for the pulsed nature of the X-ray source.
  • The derived expressions offer a framework for understanding and mitigating pileup effects in drift detectors under realistic synchrotron conditions.
  • This work is essential for optimizing detector performance and data quality in synchrotron-based X-ray measurements.