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Diffraction based method to reconstruct the spectrum of the Thomson scattering x-ray source.

Zhijun Chi1, Lixin Yan1, Zhen Zhang1

  • 1Accelerator Laboratory, Department of Engineering Physics, Tsinghua University, Beijing 100084, China and Ministry of Education, Key Laboratory of Particle and Radiation Imaging, Tsinghua University, Beijing 100084, China.

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A new method precisely measures X-ray spectra from Thomson scattering sources using Highly Oriented Pyrolytic Graphite (HOPG) crystals. This technique enables single-shot spectral analysis of ultra-short, high-intensity X-ray pulses.

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Thomson scattering X-ray sources are valuable tools in science.
  • Accurate spectral characterization of ultra-short, high-intensity X-ray pulses is crucial but challenging.

Purpose of the Study:

  • To develop and demonstrate a precise method for reconstructing the spectrum of Thomson scattering X-ray sources.
  • To enable effective spectral analysis of ultra-short and high-intensity X-ray pulses.

Main Methods:

  • Utilized diffraction from a Highly Oriented Pyrolytic Graphite (HOPG) crystal (15 mm × 15 mm × 1 mm, 1° mosaic spread).
  • Analyzed the diffraction pattern to reconstruct X-ray peak energies and spectral bandwidths.
  • Demonstrated the method at the Tsinghua Thomson scattering X-ray source.

Main Results:

  • Successfully reconstructed X-ray peak energies and energy spectral bandwidths at various polar angles.
  • Experimental results showed good agreement with theoretical values and simulations.
  • The method proved effective for single-shot measurements due to the HOPG crystal's high integral reflectivity.

Conclusions:

  • The proposed HOPG crystal diffraction method offers a precise approach for X-ray spectrum measurement.
  • This technique is suitable for characterizing ultra-short and high-intensity X-ray pulses from Thomson scattering sources.
  • The method facilitates efficient single-shot spectral analysis, meeting growing scientific demands.