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Area of Science:

  • Plasma Physics
  • High-Energy-Density Physics
  • Particle Diagnostics

Background:

  • Proton radiography is crucial for measuring electromagnetic (EM) fields in high-energy-density, laser-produced plasmas.
  • EM field information is extracted from proton fluence patterns via an inversion process.

Purpose of the Study:

  • To implement and validate nonzero boundary conditions for improved magnetic field reconstruction.
  • To develop a novel approach for determining the unperturbed proton source profile.
  • To introduce a method for quantifying inversion uncertainty due to source retrieval errors.

Main Methods:

  • Experiments conducted on laser-driven foils using the OMEGA laser.
  • Magnetic field reconstructions performed using both fluence-based and mesh-based methods.
  • Implementation of nonzero boundary conditions and iterative source profile optimization.

Main Results:

  • Nonzero boundary conditions are essential for achieving agreement between fluence-based and mesh-based reconstruction methods.
  • The novel source profile determination method significantly enhances EM field recovery accuracy.
  • A scheme to quantify uncertainty in EM field inversion is proposed.

Conclusions:

  • Accurate magnetic field reconstruction in laser-produced plasmas requires careful implementation of boundary conditions and source profile determination.
  • The developed techniques improve the reliability and accuracy of proton radiography as a diagnostic tool.
  • Quantifying uncertainty is critical for robust interpretation of reconstructed EM fields.