Two-stage acceleration of protons from relativistic laser-solid interaction

被引:7
|
作者
Liu, Jin-Lu [1 ,2 ]
Sheng, Z. M. [1 ,2 ,3 ]
Zheng, J. [1 ,2 ]
Wang, W. M. [3 ]
Yu, M. Y. [4 ,5 ]
Liu, C. S. [6 ]
Mori, W. B. [7 ,8 ]
Zhang, J. [1 ,2 ,3 ]
机构
[1] Shanghai Jiao Tong Univ, Minist Educ, Key Lab Laser Plasmas, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China
[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China
[5] Ruhr Univ Bochum, Inst Theoret Phys 1, D-44780 Bochum, Germany
[6] Univ Maryland, EW Space Sci Ctr, College Pk, MD 20742 USA
[7] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[8] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA
基金
美国国家科学基金会;
关键词
INTENSITY LASER;
D O I
10.1103/PhysRevSTAB.15.101301
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
A two-stage proton acceleration scheme using present-day intense lasers and a unique target design is proposed. The target system consists of a hollow cylinder with conical inner wall, which is followed by the main target with a flat front and a dishlike flared rear surface. At the center of the latter is a tapered proton layer, which is surrounded by side proton layers at an angle to it. In the first acceleration stage, protons in both layers are accelerated by target normal sheath acceleration. The center-layer protons are accelerated forward along the axis while the side protons are accelerated and focused towards them. As a result, the side-layer protons radially compress as well as axially further accelerate the front part of the center-layer protons in the second stage. Two-dimensional (2D) particle-in-cell (PIC) simulations show that a quasimonoenergetic proton bunch with the maximum energy over 250 MeV and energy spread similar to 17% can be generated when such a target is irradiated with an 80 fs laser pulse with focused intensity 3.1 x 10(20) W/cm(2). Three-dimensional (3D) PIC simulation gives the reduced maximum energy similar to 112 MeV but even smaller energy spread similar to 3% under the same laser conditions due to anisotropic electron acceleration with linearly polarized lasers.
引用
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页数:9
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