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Quantifying bunch-mode influence on photon-counting detectors at SPring-8.

Yasuhiko Imai1, Takaki Hatsui1

  • 1Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.

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|February 16, 2024
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Summary

Photon-counting 2D detectors exhibit varying count-loss characteristics across different bunch-modes. Understanding these detector behaviors is crucial for optimizing X-ray experiments at synchrotron facilities.

Keywords:
bunch-modescount-lossmaximun count ratesphoton-counting 2D detectorsrate correction

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Area of Science:

  • Physics
  • Materials Science
  • Instrumentation

Background:

  • Photon-counting 2D detectors are essential for modern X-ray imaging and spectroscopy.
  • Detector performance, particularly count-loss characteristics, is influenced by the timing structure of X-ray sources like synchrotron facilities.
  • Accurate data acquisition requires understanding detector linearity under varying X-ray intensities and source timing.

Purpose of the Study:

  • To investigate the count-loss characteristics of photon-counting 2D detectors across different bunch-modes at SPring-8.
  • To introduce and utilize the effective maximum count rate as an indicator of detector linearity.
  • To provide guidance for users and facility designers regarding detector performance and X-ray source timing.

Main Methods:

  • Monte Carlo simulations were employed to model detector behavior.
  • Eight distinct bunch-modes at SPring-8 were simulated.
  • The effective maximum count rate was calculated for various detector dead times (120 ns, 0.5 µs, 3 µs).

Main Results:

  • Effective maximum count rates varied significantly with bunch-mode and detector dead time, ranging from 0.009 to 0.916 Mcps (megacounts per second) pixel⁻¹.
  • Even with optimized count-loss correction, the effective maximum count rate did not exceed 1 Mcps pixel⁻¹ for equal-interval bunch-modes.
  • Differences in count-loss characteristics persisted across bunch-modes, necessitating careful experimental planning.

Conclusions:

  • Users must be aware of bunch-mode-dependent count-loss characteristics for optimal photon-counting 2D detector experiments.
  • Synchrotron facility designers should consider the impact of bunch-mode time structures on detector performance.
  • Careful consideration of detector dead time and X-ray intensity is critical for maintaining data linearity.