Effects of hole-boring and relativistic transparency on particle acceleration in overdense plasma irradiated by short multi-PW laser pulses

Abstract

Propagation of short and ultra-intense laser pulses in a semi-infinite space of overdense hydrogen plasma is analyzed via fully-relativistic, real geometry particle-in-cell (PIC) simulations including radiation friction. The relativistic transparency and hole-boring regimes are found to be sensitive to the transverse plasma field, backward light reflection, and laser pulse filamentation. For laser intensities approaching $I\sim 10^{24}$ W/cm${}^2$ the direct laser acceleration of protons, along with ion Coulomb explosion, results in their injection into the acceleration phase of the compressed electron wave at the front of the laser pulses. The protons are observed to be accelerated up to 10-20 GeV with densities around a few times the critical density. The effect strongly depends on initial density and laser intensity disappearing with initial density increase and intensity decrease.

References in corpus (7)

• Radiation Pressure Dominate Regime of Relativistic Ion Acceleration
• Dense Electron-Positron Plasmas and Ultra-Intense Bursts of Gamma-Rays from Laser-Irradiated Solids
• Hole boring in a DT pellet and fast ion ignition with ultra-intense laser pulses
• Laser-driven shock acceleration of monoenergetic ion beams
• Radiation Pressure Acceleration: the factors limiting maximum attainable ion energy
• Petawatt laser absorption bounded
• Laser opacity in underdense preplasma of solid targets due to quantum electrodynamics effects

Cited by in corpus (2)

• Charged particle motion and radiation in strong electromagnetic fields
• PIC methods in astrophysics: Simulations of relativistic jets and kinetic physics in astrophysical systems