Acceleration of Protons from a Double-Layer or Multi-Ion-Mized Foil Irradiated by Ultraintense Lasers
Acceleration of protons by the radiation pressure of a circularly polarized laser pulse with the intensity up to 1021 W/cm2 from a double-layer or multi-ionmixed thin foil is investigated by two-dimensional particle-in-cell simulations. The double-layer foil is composed of a heavy ion layer and a proton layer. It is found that the radiation pressure acceleration can be classified into three regimes according to the laser intensity due to the different critical intensities for laser transparency with different ion species. When the laser intensity is moderately high, the laser pushes the electrons neither so slowly nor so quickly that the protons can catch up with the electrons, while the heavy ions cannot. Therefore, the protons can be accelerated efficiently. The proton beam generated from the double-layer foil is of better quality and higher energy than that from a pure proton foil with the same areal electron density. When the laser intensity is relatively low, both the protons and heavy ions are accelerated together, which is not favorable to the proton acceleration. When the laser intensity is relatively high, neither the heavy ions nor the protons can be accelerated efficiently due to the laser transparency through the target.
ion acceleration radiation pressure acceleration intense laser foil interaction particle-in-cell simulation
WANG Weimin SHENG Zhengming YU Lule LI Yutong KAWATA Shigeo ZHANG Jie
Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yohtoh, Utsunomiya 321-8585, Japan
国际会议
西安
英文
277-283
2009-10-26（万方平台首次上网日期，不代表论文的发表时间）