TY - JOUR

T1 - Numerical simulations of a continuously injected relativistic electron beam relaxation into a plasma with large-scale density gradients

AU - Annenkov, Vladimir

AU - Volchok, Evgeniia

N1 - Funding Information: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: [Vladimir Annenkov reports financial support was provided by Ministry of Science and Higher Education of the Russian Federation. Evgeniia Volchok reports financial support was provided by Ministry of Science and Higher Education of the Russian Federation.] Funding Information: This work was supported by the grant MK-2676.2021.1.2 by Ministry of Science and Higher Education of the Russian Federation. Simulations were performed using the computing resources of the Center for Scientific IT-services ICT SB RAS. Publisher Copyright: © 2022 COSPAR

PY - 2023/2/15

Y1 - 2023/2/15

N2 - In this paper the influence of large-scale decreasing and increasing gradients of the density of magnetized plasma on the relaxation process of a continuously injected relativistic electron beam with an energy of 660 keV (vb=0.9c) and a pitch-angle distribution is studied using particle-in-cell numerical simulations. It is found that for the selected parameters in the case of a smoothly decreasing gradient and in a homogeneous plasma the formation of spatially limited plasma oscillations of large amplitude occurs. In such cases, modulation instability develops and a long-wave longitudinal modulation of the ion density is formed. In addition, the large amplitude of plasma waves accelerates plasma electrons to energies on the order of the beam energy. In the case of increasing and sharply decreasing gradients, a significant decrease in the amplitude of plasma oscillations and the formation of a turbulent ion density spectrum are observed. The possibility of acceleration of beam electrons to energies more than 2 times higher than the initial energy of the beam particles is also demonstrated. This process takes place not only during beam propagation in growing plasma density, but also in homogeneous plasma due to interaction of beam particles with plasma oscillations of large amplitude.

AB - In this paper the influence of large-scale decreasing and increasing gradients of the density of magnetized plasma on the relaxation process of a continuously injected relativistic electron beam with an energy of 660 keV (vb=0.9c) and a pitch-angle distribution is studied using particle-in-cell numerical simulations. It is found that for the selected parameters in the case of a smoothly decreasing gradient and in a homogeneous plasma the formation of spatially limited plasma oscillations of large amplitude occurs. In such cases, modulation instability develops and a long-wave longitudinal modulation of the ion density is formed. In addition, the large amplitude of plasma waves accelerates plasma electrons to energies on the order of the beam energy. In the case of increasing and sharply decreasing gradients, a significant decrease in the amplitude of plasma oscillations and the formation of a turbulent ion density spectrum are observed. The possibility of acceleration of beam electrons to energies more than 2 times higher than the initial energy of the beam particles is also demonstrated. This process takes place not only during beam propagation in growing plasma density, but also in homogeneous plasma due to interaction of beam particles with plasma oscillations of large amplitude.

KW - Electron beams

KW - Particle acceleration

KW - Plasma

KW - Sun

KW - Two-stream instability

KW - Waves

UR - http://www.scopus.com/inward/record.url?scp=85137018018&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/32b048e9-bcfb-3f1e-a1c3-b5030c8ffb9b/

U2 - 10.1016/j.asr.2022.08.036

DO - 10.1016/j.asr.2022.08.036

M3 - Article

AN - SCOPUS:85137018018

VL - 71

SP - 1948

EP - 1961

JO - Advances in Space Research

JF - Advances in Space Research

SN - 0273-1177

IS - 4

ER -