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X-ray characterization of a multichannel smart-pixel array detector.

Steve Ross1, Michael Haji-Sheikh1, Andrew Huntington2

  • 1Northern Illinois University, Department of Electrical Engineering, DeKalb, IL 60115, USA.

Journal of Synchrotron Radiation
|December 25, 2015
PubMed
Summary
This summary is machine-generated.

The Voxtel VX-798 X-ray pixel array detector (PAD) demonstrates selective X-ray counting with high energy and time resolution. This smart-pixel technology enables advanced synchrotron X-ray measurements.

Keywords:
CMOS ASICX-ray detectorpixel array detector

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Area of Science:

  • Materials Science
  • Instrumentation
  • Physics

Background:

  • The development of advanced X-ray detectors is crucial for high-resolution scientific imaging and spectroscopy.
  • Existing detectors often face limitations in energy resolution, time resolution, or count rate capabilities.

Purpose of the Study:

  • To present the first synchrotron X-ray characterization of the Voxtel VX-798 prototype X-ray pixel array detector (PAD).
  • To demonstrate the detector's capability for selective X-ray counting with precise energy and time windowing.
  • To evaluate the detector's performance for advanced synchrotron-based measurements.

Main Methods:

  • Characterization of the 48x48 pixel silicon PAD coupled to a CMOS readout ASIC using synchrotron X-rays.
  • Testing of individual X-ray counting within defined time windows and energy ranges.
  • Measurement of energy resolution, gating time, linearity, and spatial resolution (line and point spread functions).

Main Results:

  • The detector achieved a 60 ns gating time and 700 eV energy resolution, matching design parameters.
  • Demonstrated selective X-ray counting per pixel with programmable energy and time windows.
  • Linearity followed an isolated dead-time model, suggesting potential for megahertz count rates.
  • Negligible spatial blurring was observed, and picosecond time-resolved measurements were achieved.

Conclusions:

  • The Voxtel VX-798 PAD is a high-performance detector suitable for advanced synchrotron applications.
  • Its smart-pixel technology allows software optimization of energy and time resolution.
  • The detector is capable of performing picosecond time-resolved X-ray diffraction and fluorescence spectroscopy.