中国物理B ›› 2024, Vol. 33 ›› Issue (6): 64101-064101.doi: 10.1088/1674-1056/ad2dcb

• • 上一篇    下一篇

Divergence angle consideration in energy spread measurement for high-quality relativistic electron beam in laser wakefield acceleration

Guang-Wei Lu(卢光伟)1, Yao-Jun Li(李曜均)1, Xi-Chen Hu(胡曦辰)1, Si-Yu Chen(陈思宇)1, Hao Xu(徐豪)1, Ming-Yang Zhu(祝铭阳)1, Wen-Chao Yan(闫文超)1,2,†, and Li-Ming Chen(陈黎明)1,2,‡   

  1. 1 Key Laboratory for Laser Plasmas of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;
    2 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
  • 收稿日期:2023-11-24 修回日期:2023-12-26 接受日期:2024-02-28 出版日期:2024-06-18 发布日期:2024-06-18
  • 通讯作者: Wen-Chao Yan, Li-Ming Chen E-mail:wenchaoyan@sjtu.edu.cn;lmchen@sjtu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1601700), the National Natural Science Foundation of China (Grant Nos. 12074251, 11991073, 12335016, 12305272, and 12105174), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA25000000 and XDA25030400), and Yangyang Development Fund, China.

Divergence angle consideration in energy spread measurement for high-quality relativistic electron beam in laser wakefield acceleration

Guang-Wei Lu(卢光伟)1, Yao-Jun Li(李曜均)1, Xi-Chen Hu(胡曦辰)1, Si-Yu Chen(陈思宇)1, Hao Xu(徐豪)1, Ming-Yang Zhu(祝铭阳)1, Wen-Chao Yan(闫文超)1,2,†, and Li-Ming Chen(陈黎明)1,2,‡   

  1. 1 Key Laboratory for Laser Plasmas of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;
    2 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2023-11-24 Revised:2023-12-26 Accepted:2024-02-28 Online:2024-06-18 Published:2024-06-18
  • Contact: Wen-Chao Yan, Li-Ming Chen E-mail:wenchaoyan@sjtu.edu.cn;lmchen@sjtu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1601700), the National Natural Science Foundation of China (Grant Nos. 12074251, 11991073, 12335016, 12305272, and 12105174), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA25000000 and XDA25030400), and Yangyang Development Fund, China.

摘要: The thorough exploration of the transverse quality represented by divergence angle has been lacking yet in the energy spread measurement of the relativistic electron beam for laser wakefield acceleration (LWFA). In this work, we fill this gap by numerical simulations based on the experimental data, which indicate that in a C-shape magnet, magnetic field possesses the beam focusing effect, considering that the divergence angle will result in an increase in the full width at half maxima (FWHM) of the electron density distribution in a uniformly isotropic manner, while the length-to-width ratio decreases. This indicates that the energy spread obtained from the electron deflection distance is smaller than the actual value, regardless of the divergence angle. A promising and efficient way to accurately correct the value is presented by considering the divergence angle (for instance, for an electron beam with a length-to-width ratio of 1.12, the energy spread correct from 1.2% to 1.5%), providing a reference for developing the high-quality electron beam source.

关键词: relativistic electron beams, acceleration by laser-plasma interactions, finite element analysis

Abstract: The thorough exploration of the transverse quality represented by divergence angle has been lacking yet in the energy spread measurement of the relativistic electron beam for laser wakefield acceleration (LWFA). In this work, we fill this gap by numerical simulations based on the experimental data, which indicate that in a C-shape magnet, magnetic field possesses the beam focusing effect, considering that the divergence angle will result in an increase in the full width at half maxima (FWHM) of the electron density distribution in a uniformly isotropic manner, while the length-to-width ratio decreases. This indicates that the energy spread obtained from the electron deflection distance is smaller than the actual value, regardless of the divergence angle. A promising and efficient way to accurately correct the value is presented by considering the divergence angle (for instance, for an electron beam with a length-to-width ratio of 1.12, the energy spread correct from 1.2% to 1.5%), providing a reference for developing the high-quality electron beam source.

Key words: relativistic electron beams, acceleration by laser-plasma interactions, finite element analysis

中图分类号:  (Relativistic electron and positron beams)

  • 41.75.Ht
52.38.Kd (Laser-plasma acceleration of electrons and ions) 02.70.Dh (Finite-element and Galerkin methods)