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Selective Ion Acceleration by Intense Radiation Pressure.

A McIlvenny1, D Doria1,2, L Romagnani1,3

  • 1Centre for Plasma Physics, Queens University Belfast, Belfast BT7 1NN, United Kingdom.

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|November 19, 2021
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Summary
This summary is machine-generated.

This study demonstrates selective acceleration of carbon ions using intense laser pulses. Optimized conditions yielded higher carbon ion energies than protons, a novel finding in laser-driven ion acceleration.

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Area of Science:

  • Plasma Physics
  • Laser-driven Ion Acceleration

Background:

  • Laser-matter interactions are crucial for particle acceleration.
  • Typically, protons are preferentially accelerated over heavier ions in laser-foil experiments.

Purpose of the Study:

  • To investigate selective acceleration of carbon ions using intense, circularly polarized laser pulses.
  • To understand the underlying acceleration mechanisms and identify optimal conditions for heavy ion acceleration.

Main Methods:

  • Interaction of ultrashort, circularly polarized laser pulses (5.5×10^20 W/cm^2) with ultrathin carbon foils.
  • Experimental measurements of ion energies and supporting particle-in-cell simulations.
  • Analysis of laser pulse contrast and target thickness effects.

Main Results:

  • Selective acceleration of carbon ions was achieved, outperforming contaminant protons (33 MeV/nucleon vs 18 MeV).
  • Different dominant acceleration mechanisms were identified for carbon ions and protons.
  • An intensity-dependent optimum target thickness for radiation pressure acceleration was highlighted.

Conclusions:

  • Preceding laser energy significantly influences preferential acceleration of heavier ions.
  • Optimized laser parameters and target conditions can enable selective heavy ion acceleration, contrary to typical observations.
  • Findings suggest novel pathways for generating high-energy heavy ion beams.