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Suppression of multiple ion bunches and generation of monoenergetic ion beams in laser foil-plasma |
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| Authors: | Zhang Shan Xie Bai-Song Hong Xue-Ren Wu Hai-Cheng Aimierding Aimidul Zhao Xue-Yan and Liu Ming-Ping |
| Institution: | College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;School of Information Engineering, Nanchang University, Nanchang 330031, China |
| Abstract: | In one-dimensional particle-in-cell simulations, this paper shows that the formation of multiple ion bunches is disadvantageous to the generation of monoenergetic ion beams and can be suppressed by choosing an optimum target thickness in the radiation pressure acceleration mechanism by a circularly polarised laser pulse. As the laser pulse becomes intense, the optimum target thickness obtained by a non-relativistic treatment is no longer adequate. Considering the relativistic Doppler-shifted pressure, it proposes a relativistic formulation to determine the optimum target thickness. The theoretical predictions agree with the simulation results well. The model is also valid for two-dimensional cases. The accelerated ion beams can be compelled to be more stable by choosing the optimum target thickness when they exhibit some unstable behaviours. |
| Keywords: | interaction of ultrastrong laser pulse and plasma radiation pressure acceleration optimum target thickness |
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