Generation of quasi-monoenergetic heavy ion beams via staged shock wave acceleration driven by intense laser pulses in near-critical plasmas

Abstract

Laser-driven ion acceleration potentially offers a compact, cost-effective alternative to conventional accelerators for scientific, technological, and health-care applications. A novel scheme for heavy ion acceleration in near-critical plasmas via staged shock waves driven by intense laser pulses is proposed, where, in front of the heavy ion target, a light ion layer is used for launching a high-speed electrostatic shock wave. This shock is enhanced at the interface before it is transmitted into the heavy ion plasmas. Monoenergetic heavy ion beam with much higher energy can be generated by the transmitted shock, comparing to the shock wave acceleration in pure heavy ion target. Two-dimensional particle-in-cell simulations show that quasi-monoenergetic ${{\rm{C}}}^{6+}$ ion beams with peak energy 168 MeV and considerable particle number $2.1\,\times {10}^{11}$ are obtained by laser pulses at intensity of $1.66\,\times {10}^{20}$ ${\rm{W}}\,{\mathrm{cm}}^{-2}$ in such staged shock wave acceleration scheme. Similarly a high-quality ${\mathrm{Al}}^{10+}$ ion beam with a well-defined peak with energy 250 MeV and spread $\delta E/{E}_{0}=30 \% $ can also be obtained in this scheme.

Keywords

• staged shock waves
• laser-driven heavy ion acceleration
• adjustable energy spectrum
• near-critical plasmas
• shock transmission
• shock wave acceleration