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Transition Radiation Field Enhanced Laser Proton Acceleration Employing Near-Critical-Density Foam.

C Y Qin1, X S Geng1, H Zhang2,3

  • 1State Key Laboratory of Ultra-intense Laser Science and Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.

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We demonstrate a novel laser proton acceleration scheme using transition radiation fields (TRF) generated by electron bunches. This method significantly boosts proton energy, reaching 90 MeV, and enhances energy coupling for compact accelerators and radiation oncology.

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Area of Science:

  • Plasma Physics
  • Laser-Particle Acceleration
  • High-Energy Physics

Background:

  • Laser-driven protons are crucial for applications like flash radiation oncology and compact accelerators.
  • Efficient energy coupling in laser-induced acceleration is challenging, requiring hybrid mechanisms.
  • Optimizing proton energy necessitates combining multiple accelerating field contributions.

Purpose of the Study:

  • To report a novel laser proton acceleration scheme.
  • To enhance proton energy by utilizing a transition radiation field (TRF).
  • To investigate the synergistic effects of TRF and charge-separation fields (CSF) on proton acceleration.

Main Methods:

  • Experimental production of high-charge electron beams (>30 nC, >13 MeV) using near-critical-density plasmas.
  • Generation of intense transition radiation fields (TRF) by exiting electron beams.
  • Superposition of TRF with charge-separation fields (CSF) for proton acceleration.
  • Analysis of proton energy spectra and comparison with multi-dimensional kinetic simulations.

Main Results:

  • Experimentally produced electron beams emitted intense TRF (up to 0.6 J in 0.1-15 THz range).
  • Proton cut-off energy was boosted by over a factor of two, reaching 90 MeV, due to TRF and CSF superposition.
  • Resulting proton spectra exhibited a distinctive plateau-shaped feature at high energies.
  • Simulations confirmed the synergistic role of TRF and CSF in enhancing proton energy and shaping spectral structure.

Conclusions:

  • The proposed scheme effectively enhances laser-driven proton acceleration.
  • The synergistic interaction between TRF and CSF is key to boosting proton energy and spectral characteristics.
  • This research offers new insights into relativistic electron beam-field coupling for efficient proton acceleration.