Effects of self-focusing on tunnel-ionization-induced injection in a laser wakefield accelerator

DOI PDF 被引用文献1件
  • Changquan Xia
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Jiansheng Liu
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Wentao Wang
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Haiyang Lu
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Wang Cheng
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Aihua Deng
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Wentao Li
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Hui Zhang
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Xiaoyan Liang
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Yuxin Leng
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Xiaoming Lu
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Cheng Wang
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Jianzhou Wang
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Kazuhisa Nakajima
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Ruxin Li
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China
  • Zhizhan Xu
    State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics 1 , Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, People’s Republic of China

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<jats:p>We report on the study of the self-focusing effects on the tunnel-ionization-induced injection in a laser wakefield accelerator. Targets composed of a gas mixture of 94% helium and 6% oxygen were used. The energy, energy spread, and charge of the generated electron beams can be adjusted by changing the input laser intensity and the plasma density, but the different aspects of the properties of the electron beams were not independent. It was inferred that the K-shell electrons of oxygen were ionized and injected into the plasma wake for acceleration when the laser intensity was increased beyond the threshold for generating O7+ by tunnel-ionization, due to the relativistic self-focusing in the propagation. Controlling the self-focusing of the laser beam by adjusting the input laser energy to shorten the distance over which the electrons were injected into the wake, quasi-monoenergetic electron beams were observed.</jats:p>

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