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Leonida A Gizzi1,2, Elisabetta Boella3,4, Luca Labate5,6

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Introducing a micrometer scale-length pre-plasma significantly boosts proton acceleration energy from laser-solid interactions. This enhancement in fast electron population and energy distribution is key for laser-driven particle acceleration.

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Area of Science:

  • Plasma Physics
  • High-Intensity Laser-Matter Interactions
  • Particle Acceleration

Background:

  • The plasma gradient at the vacuum-solid interface critically influences ultraintense laser pulse absorption and electron heating.
  • Micrometer scale-length plasmas are theoretically predicted to enhance fast electron populations for laser-driven proton acceleration.
  • Understanding these interactions is crucial for advancing laser-driven ion acceleration techniques.

Purpose of the Study:

  • To experimentally investigate the effect of a micrometer scale-length pre-plasma on proton acceleration from laser-solid interactions.
  • To validate theoretical predictions regarding the role of pre-plasma in enhancing fast electron populations.
  • To elucidate the mechanisms behind enhanced proton cut-off energy in laser-driven acceleration.

Main Methods:

  • Utilizing ultraintense femtosecond laser pulses interacting with thin foil targets.
  • Introducing a micrometer scale-length pre-plasma using a low-energy femtosecond pre-pulse.
  • Employing realistic numerical simulations to model laser-plasma interactions and particle dynamics.

Main Results:

  • A threefold increase in proton cut-off energy was observed with the introduction of a micrometer scale-length pre-plasma.
  • Experimental findings align with numerical simulations predicting enhanced proton acceleration.
  • Stochastic heating of fast electrons was confirmed as a key factor in enhancing the accelerating sheath field.

Conclusions:

  • The controlled creation of micrometer scale-length pre-plasmas is an effective strategy to significantly enhance laser-driven proton acceleration.
  • Pre-plasma engineering plays a vital role in optimizing energy transfer and particle acceleration efficiency.
  • These findings advance the understanding and application of high-intensity laser-plasma interactions for generating energetic ion beams.