Dynamics of high-energy proton beam acceleration and focusing from hemisphere-cone targets by high-intensity lasers

被引:49
作者
Qiao, B. [1 ]
Foord, M. E. [2 ]
Wei, M. S. [3 ]
Stephens, R. B. [3 ]
Key, M. H. [2 ]
McLean, H. [2 ]
Patel, P. K. [2 ]
Beg, F. N. [1 ]
机构
[1] Univ Calif San Diego, Ctr Energy Res, La Jolla, CA 92093 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA 94511 USA
[3] Gen Atom, San Diego, CA 92121 USA
来源
PHYSICAL REVIEW E | 2013年 / 87卷 / 01期
关键词
GENERATION; SIMULATION; IRRADIATION; TRANSPORT; PLASMA;
D O I
10.1103/PhysRevE.87.013108
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Acceleration and focusing of high-energy proton beams from fast-ignition (FI) -related hemisphere-cone assembled targets have been numerically studied by hybrid particle-in-cell simulations and compared with those from planar-foil and open-hemisphere targets. The whole physical process including the laser-plasma interaction has been self-consistently modeled for 15 ps, at which time the protons reach asymptotic motion. It is found that the achievable focus of proton beams is limited by the thermal pressure gradients in the co-moving hot electrons, which induce a transverse defocusing electric field that bends proton trajectories near the axis. For the advanced hemisphere-cone target, the flow of hot electrons along the cone wall induces a local transverse focusing sheath field, resulting in a clear enhancement in proton focusing; however, it leads to a significant loss of longitudinal sheath potential, reducing the total conversion efficiency from laser to protons. DOI: 10.1103/PhysRevE.87.013108
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页数:8
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