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  • Letter

Anomalous staged hot-electron acceleration by two-plasmon decay instability in magnetized plasmas

X. X. Li1, R. J. Cheng1, Qing Wang1, D. J. Liu1, S. Y. Lv1, Z. M. Huang1, S. T. Zhang1, X. M. Li1, Z. J. Chen2 et al.

Qiang Wang1, Z. J. Liu1,3,*, L. H. Cao1,3, C. Y. Zheng1,3, and X. T. He1,3

  • 1Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
  • 2HEDPS, Center for Applied Physics and Technology, and State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
  • 3HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University, Beijing 100871, China

  • *liuzj@iapcm.ac.cn
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Phys. Rev. E 108, L053201 – Published 7 November, 2023

DOI: https://doi.org/10.1103/PhysRevE.108.L053201

Abstract

We present a staged hot-electron acceleration mechanism of the two-plasmon decay (TPD) instability in the transverse magnetic field under the parameters relevant to inertial confinement fusion experiments. After being accelerated by the forward electron plasma wave (FEPW) of TPD, the hot-electrons can be anomalously accelerated again by the backward electron plasma wave (BEPW) of TPD and then obtain higher energy. Moreover, the surfatron acceleration mechanism of TPD in the magnetic field is also confirmed, the electrons trapped by the TPD daughter EPWs are accelerated in the direction along the wave front. Interestingly, the velocity of electrons accelerated by surfing from the FEPW is quite easily close to the BEPW phase velocity, which markedly enhances the efficiency of the staged acceleration. The coexistence of these two acceleration mechanisms leads to a significant increase of energetic electrons generated by TPD in the magnetic field. Meanwhile the EPWs are dissipated, TPD instability is effectively suppressed, and the laser transmission increases.

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Phys. Rev. E 108, L053201– Published 7 November, 2023
  • Received 14 July 2023
  • Accepted 12 October 2023
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