High-quality proton bunch from laser interaction with a gas-filled cone target

Abstract

Generation of high-energy proton bunch from interaction of an intense short circularly polarized(CP) laser pulse with a gas-filled cone target(GCT) is investigated using two-dimensional particle-in-cell simulation. The GCT target consists of a hollow cone filled with near-critical gas-plasma and a thin foil attached to the tip of the cone. It is observed that as the laser pulse propagates in the gas-plasma, the nonlinear focusing will result in an enhancement of the laser pulse intensity. It is shown that a large number of energetic electrons are generated from the gas-plasma and accelerated by the self-focused laser pulse. The energetic electrons then transports through the foil, forming a backside sheath field which is stronger than that produced by a simple planar target. A quasi-monoenergetic proton beam with maximum energy of 181 MeV is produced from this GCT target irradiated by a CP laser pulse at an intensity of $2.6\times 10^{20}W/c{m}^2$, which is nearly three times higher compared to simple planar target(67MeV).

References in corpus (4)

• Hole boring in a DT pellet and fast ion ignition with ultra-intense laser pulses
• Novel path towards compact laser ion accelerators for hadron therapy: Tenfold energy increase in laser-driven multi-MeV ion generation using a gas target mixed with submicron clusters
• Generation of GeV protons from 1 PW laser interaction with near critical density targets
• Self-organizing GeV, nano-Coulomb, collimated proton beam from laser foil interaction at 7 * 10^21 W/cm2