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Generation of ultrahigh field by micro-bubble implosion.

M Murakami1, A Arefiev2, M A Zosa3

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Researchers propose a novel bubble implosion technique using micro-bubbles and intense lasers to accelerate protons beyond 100 MeV. This method could advance fundamental physics and applications like tumor therapy.

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Area of Science:

  • Plasma Physics
  • Laser-Induced Acceleration
  • Particle Physics

Background:

  • Proton acceleration is crucial for fundamental physics research and applications such as inertial confinement fusion and tumor therapy.
  • Achieving proton energies beyond 100 MeV presents significant scientific and technological challenges.

Purpose of the Study:

  • To introduce and validate a novel concept for generating ultrahigh fields and relativistic protons via bubble implosions.
  • To explore the potential of this method for breaking the 100-MeV barrier in proton acceleration.

Main Methods:

  • Combining micro-bubbles with ultraintense laser pulses (10^20-10^22 W cm^-2).
  • Utilizing spherically symmetric Coulomb forces for volumetric proton acceleration.
  • Conducting three-dimensional particle-in-cell simulations to model bubble dynamics.

Main Results:

  • Demonstrated the formation of ultrahigh electric fields and relativistic protons.
  • Observed volumetric acceleration of bubble wall protons towards the center.
  • Simulations confirmed the robustness of Coulomb-imploded bubbles acting as nano-pulsars with repeated implosions/explosions.

Conclusions:

  • The proposed bubble implosion concept offers a viable pathway to generate energetic proton flashes.
  • The method is robust and has the potential to achieve proton energies exceeding the 100-MeV threshold.
  • Experimental verification is feasible with current technological capabilities.