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Optimizing laser-driven proton acceleration from overdense targets.

A Stockem Novo1, M C Kaluza2,3, R A Fonseca4,5

  • 1Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- &Astrophysik, Ruhr-Universität, Bochum, Germany.

Scientific Reports
|July 21, 2016
PubMed
Summary
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We control ion acceleration in laser-plasma interactions by tuning to collisionless shock acceleration. This method optimizes ion beam properties like maximum energy and ion count for potential 100 MeV proton beams.

Area of Science:

  • Physics
  • Plasma Physics
  • Laser-Plasma Interactions

Background:

  • Laser-plasma interactions offer pathways for ion acceleration.
  • Controlling ion beam properties is crucial for applications.

Purpose of the Study:

  • To demonstrate tuning of ion acceleration mechanisms to collisionless shock acceleration.
  • To achieve control over final ion beam properties.

Main Methods:

  • Three-dimensional particle-in-cell simulations.
  • Utilizing a two-pulse laser setup with an isolated solid density target.
  • Investigating various ion acceleration regimes: target normal sheath acceleration, hole boring, and collisionless shock acceleration.

Main Results:

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  • Collisionless shock acceleration yields the most energetic ions when target density is near-critical (ne ≈ 0.5 ncr).
  • Tuning laser pulse timing allows access to different acceleration regimes.
  • Scaling laser power suggests 100 MeV protons are achievable in the petawatt (PW) range.

    • Conclusions:

    • Collisionless shock acceleration is a viable mechanism for high-energy ion beam generation.
    • Precise control over laser parameters enables tailoring of ion beam characteristics.
    • The proposed technique shows promise for experimental realization of MeV proton beams.