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Area of Science:

  • Plasma Physics
  • X-ray Spectroscopy
  • Laser-Driven Acceleration

Background:

  • Laser plasma accelerators (LPAs) produce broadband X-ray sources.
  • Accurate characterization of X-ray spectra and photon flux is essential for understanding LPA physics.
  • Existing methods have limitations in covering the broad energy range and ensuring confidence.

Purpose of the Study:

  • To develop and validate versatile methods for analyzing X-ray energy spectra and photon flux from picosecond laser-driven LPA experiments.
  • To combine multiple analysis techniques for improved confidence and accuracy in X-ray measurements.
  • To characterize and measure X-ray spectra from different emission mechanisms.

Main Methods:

  • Development of a versatile analysis suite combining forward fit, Ross pair, and differential average transmission analysis.
  • Application of methods to three diagnostics: filter wheel (<40 keV), stacked image plate spectrometer (35-100 keV), and step wedge (60-1000 keV).
  • Characterization using laser-driven bremsstrahlung X-rays and measurement of betatron, inverse Compton scattering, and bremsstrahlung X-ray mechanisms.

Main Results:

  • Successful characterization of analysis methods using laser-driven bremsstrahlung X-rays.
  • Measurement of X-ray energy spectra from 10 keV to 1 MeV.
  • Achieved peak flux exceeding 10^10 photons/keV/Sr for broadband X-ray sources.

Conclusions:

  • The combined analysis methods provide a robust and accurate tool for measuring broadband X-ray sources from LPAs.
  • The developed methods enhance confidence in characterizing X-ray spectra across a wide energy range (keV to MeV).
  • This work supports advancements in laser-driven particle acceleration and X-ray science.