中国物理B ›› 2018, Vol. 27 ›› Issue (3): 35201-035201.doi: 10.1088/1674-1056/27/3/035201

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Laser-driven relativistic electron dynamics in a cylindrical plasma channel

Pan-Fei Geng(耿盼飞), Wen-Juan Lv(吕文娟), Xiao-Liang Li(李晓亮), Rong-An Tang(唐荣安), Ju-Kui Xue(薛具奎)   

  1. Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China
  • 收稿日期:2017-09-08 修回日期:2017-11-12 出版日期:2018-03-05 发布日期:2018-03-05
  • 通讯作者: Ju-Kui Xue E-mail:xuejk@nwnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11475027, 11765017, 11764039, 11305132, and 11274255), the Natural Science Foundation of Gansu Province, China (Grant No. 17JR5RA076), and the Scientific Research Project of Gansu Higher Education, China (Grant No. 2016A-005).

Laser-driven relativistic electron dynamics in a cylindrical plasma channel

Pan-Fei Geng(耿盼飞), Wen-Juan Lv(吕文娟), Xiao-Liang Li(李晓亮), Rong-An Tang(唐荣安), Ju-Kui Xue(薛具奎)   

  1. Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China
  • Received:2017-09-08 Revised:2017-11-12 Online:2018-03-05 Published:2018-03-05
  • Contact: Ju-Kui Xue E-mail:xuejk@nwnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11475027, 11765017, 11764039, 11305132, and 11274255), the Natural Science Foundation of Gansu Province, China (Grant No. 17JR5RA076), and the Scientific Research Project of Gansu Higher Education, China (Grant No. 2016A-005).

摘要: The energy and trajectory of the electron, which is irradiated by a high-power laser pulse in a cylindrical plasma channel with a uniform positive charge and a uniform negative current, have been analyzed in terms of a single-electron model of direct laser acceleration. We find that the energy and trajectory of the electron strongly depend on the positive charge density, the negative current density, and the intensity of the laser pulse. The electron can be accelerated significantly only when the positive charge density, the negative current density, and the intensity of the laser pulse are in suitable ranges due to the dephasing rate between the wave and electron motion. Particularly, when their values satisfy a critical condition, the electron can stay in phase with the laser and gain the largest energy from the laser. With the enhancement of the electron energy, strong modulations of the relativistic factor cause a considerable enhancement of the electron transverse oscillations across the channel, which makes the electron trajectory become essentially three-dimensional, even if it is flat at the early stage of the acceleration.

关键词: laser-plasma interaction, direct laser acceleration, cylindrical plasma channel

Abstract: The energy and trajectory of the electron, which is irradiated by a high-power laser pulse in a cylindrical plasma channel with a uniform positive charge and a uniform negative current, have been analyzed in terms of a single-electron model of direct laser acceleration. We find that the energy and trajectory of the electron strongly depend on the positive charge density, the negative current density, and the intensity of the laser pulse. The electron can be accelerated significantly only when the positive charge density, the negative current density, and the intensity of the laser pulse are in suitable ranges due to the dephasing rate between the wave and electron motion. Particularly, when their values satisfy a critical condition, the electron can stay in phase with the laser and gain the largest energy from the laser. With the enhancement of the electron energy, strong modulations of the relativistic factor cause a considerable enhancement of the electron transverse oscillations across the channel, which makes the electron trajectory become essentially three-dimensional, even if it is flat at the early stage of the acceleration.

Key words: laser-plasma interaction, direct laser acceleration, cylindrical plasma channel

中图分类号:  (Laser-plasma interactions)

  • 52.38.-r
52.38.Kd (Laser-plasma acceleration of electrons and ions) 41.75.Jv (Laser-driven acceleration?)