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Electron Modulational Instability in the Strong Turbulent Regime for an Electron Beam Propagating in a Background Plasma

Haomin Sun1,2,4,*, Jian Chen3, Igor D. Kaganovich1, Alexander Khrabrov1, and Dmytro Sydorenko5

  • 1Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
  • 2CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei, Anhui, People’s Republic of China
  • 3Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, People’s Republic of China
  • 4CAS Center for Excellence in Comparative Planetology, People’s Republic of China
  • 5University of Alberta, Edmonton, Alberta T6G 2E1, Canada

  • *Corresponding author. haomins@princeton.edu
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Phys. Rev. Lett. 129, 125001 – Published 12 September, 2022

DOI: https://doi.org/10.1103/PhysRevLett.129.125001

Abstract

We study collective processes for an electron beam propagating through a background plasma using simulations and analytical theory. A new regime where the instability of a Langmuir wave packet can grow locally much faster than ion frequency is clearly identified. The key feature of this new regime is an electron modulational instability that rapidly creates a local Langmuir wave packet, which in its turn produces local charge separation and strong ion density perturbations because of the action of the ponderomotive force, such that the beam-plasma wave interaction stops being resonant. Three evolution stages of the process and observed periodic burst features are discussed. Different physical regimes in the plasma and beam parameter space are demonstrated for the first time.

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Physical regimes of electrostatic wave-wave nonlinear interactions generated by an electron beam propagating in a background plasma

Haomin Sun, Jian Chen, Igor D. Kaganovich, Alexander Khrabrov, and Dmytro Sydorenko
Phys. Rev. E 106, 035203 (2022)

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Phys. Rev. Lett. 129, 125001– Published 12 September, 2022
  • Received 5 April 2022
  • Revised 28 June 2022
  • Accepted 1 August 2022
Article part of CHORUS
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