Branching of High-Current Relativistic Electron Beam in Porous Materials

Propagation of high-current relativistic electron beam (REB) in plasma is relevant to many high-energy astrophysical phenomena as well as applications based on high-intensity lasers and charged-particle beams. Here, we report a new regime of beam-plasma interaction arising from REB propagation in me...

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Published in:Physical review letters 2023-05, Vol.130 (18), p.185001-185001, Article 185001
Main Authors: Jiang, K, Huang, T W, Li, R, Yu, M Y, Zhuo, H B, Wu, S Z, Zhou, C T, Ruan, S C
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container_end_page 185001
container_issue 18
container_start_page 185001
container_title Physical review letters
container_volume 130
creator Jiang, K
Huang, T W
Li, R
Yu, M Y
Zhuo, H B
Wu, S Z
Zhou, C T
Ruan, S C
description Propagation of high-current relativistic electron beam (REB) in plasma is relevant to many high-energy astrophysical phenomena as well as applications based on high-intensity lasers and charged-particle beams. Here, we report a new regime of beam-plasma interaction arising from REB propagation in medium with fine structures. In this regime, the REB cascades into thin branches with local density a hundred times the initial value and deposits its energy 2 orders of magnitude more efficiently than that in homogeneous plasma, where REB branching does not occur, of similar average density. Such beam branching can be attributed to successive weak scatterings of the beam electrons by the unevenly distributed magnetic fields induced by the local return currents in the skeletons of the porous medium. Results from a model for the excitation conditions and location of the first branching point with respect to the medium and beam parameters agree well with that from pore-resolved particle-in-cell simulations.
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title Branching of High-Current Relativistic Electron Beam in Porous Materials
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