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Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities.

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Laser-driven ion sources generate high-energy particle beams for medical accelerators. This study demonstrates robust ion acceleration using ultraintense lasers and thin foils, relaxing laser requirements for applications.

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Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Particle Acceleration

Background:

  • Laser-driven ion sources offer high energy, high peak current beams for applications like compact medical accelerators.
  • Robust acceleration schemes require stability and controllability, which are sensitive to laser temporal contrast.

Purpose of the Study:

  • To demonstrate robust generation of energetic ions using ultraintense femtosecond lasers and thin Formvar foils.
  • To investigate the influence of laser contrast on ion acceleration performance and target requirements.
  • To identify interaction parameters for application-specific energetic ion beam delivery.

Main Methods:

  • Irradiation of sub-micrometre Formvar foils with ultraintense lasers (>10^21 Wcm^-2).
  • Generation of extreme localized space charge fields (≳30 TVm^-1) via relativistically induced transparency.
  • Replication of the acceleration mechanism on two different laser facilities.

Main Results:

  • >60 MeV protons and >30 MeV u^-1 carbon ions were generated.
  • Optimum target thickness decreased with improved laser contrast due to reduced pre-expansion.
  • Ion acceleration was demonstrated across different laser contrast levels.

Conclusions:

  • Energetic ions can be accelerated via relativistically induced transparency, even with varying laser contrast.
  • This mechanism relaxes stringent laser requirements, broadening applicability.
  • The study provides insights into optimizing parameters for application-specific ion beam generation.