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Area of Science:

  • Physics
  • Plasma Physics
  • Laser-driven particle acceleration

Background:

  • Compact laser-plasma ion sources have diverse applications, driving demand for higher ion energies and efficiencies.
  • Laser-plasma interactions are complex, offering opportunities for hybrid acceleration schemes to improve control over ion beams.

Purpose of the Study:

  • To experimentally demonstrate an efficient hybrid scheme for proton acceleration.
  • To investigate the underlying physics of radiation pressure-sheath acceleration enhanced by relativistic transparency.

Main Methods:

  • Irradiation of ultrathin foils with linearly polarized laser pulses.
  • Experimental investigation of proton acceleration using a hybrid radiation pressure-sheath acceleration scheme.
  • Analysis of double-peaked electrostatic field structures and super-thermal electron jets.

Main Results:

  • Achieved proton energies exceeding 94 MeV.
  • Demonstrated enhancement of acceleration via relativistic transparency and super-thermal electron jets at optimal foil thickness.
  • Identified a double-peaked electrostatic field structure crucial for efficient acceleration.

Conclusions:

  • The hybrid radiation pressure-sheath acceleration scheme is effective for high-energy proton production.
  • Relativistic transparency and electron dynamics play a key role in optimizing laser-plasma ion acceleration.
  • This approach has implications for future multi-petawatt laser facilities and advanced ion acceleration techniques.