Ionization injection in a laser wakefield accelerator subject to a transverse magnetic field

被引：19
|
作者：
Zhao, Q. [1 ,2 ]
Weng, S. M. [1 ,2 ]
Sheng, Z. M. [1 ,2 ,3 ,6 ]
Chen, M. [1 ,2 ]
Zhang, G. B. [1 ,4 ]
Mori, W. B. [5 ]
Hidding, B. [3 ]
Jaroszynski, D. A. [3 ]
Zhang, J. [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Laser Plasmas MoE, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Collaborat Innovat Ctr IFSA, Shanghai 200240, Peoples R China
[3] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland
[4] Natl Univ Def Technol, Coll Liberal Arts & Sci, Changsha 410073, Hunan, Peoples R China
[5] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[6] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
来源：
NEW JOURNAL OF PHYSICS | 2018年 / 20卷
基金：
美国国家科学基金会; 中国国家自然科学基金; 英国工程与自然科学研究理事会; 欧盟地平线“2020”;
关键词：
laser wakefield acceleration; ionization injection; particle-in-cell simulation; beam loading; high magnetic field; ELECTRON INJECTION; PULSES;
D O I：
10.1088/1367-2630/aac926
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. Onapplication of a few tens of Tesla magnetic field, both the electron trapping condition and the wakefield structure changes significantly such that injection occurs over a shorter distance and at an enhanced rate. Furthermore, beam loading is compensated for, as a result of the intrinsic trapezoidal-shaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field.
引用
收藏
页数：10
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