Ion-focused propagation of a relativistic electron beam in the self-generated plasma in atmosphere

doi:10.1088/1674-1056/ac4a60

Abstract It is known that ion-focused regime (IFR) can effectively suppress expansion of a relativistic electron beam (REB). Using the particle-in-cell Monte Carlo collision (PIC-MCC) method, we numerically investigate the propagation of an REB in neutral gas. The results demonstrate that the beam body is charge neutralization and a stable IFR can be established. As a result, the beam transverse dimensions and longitudinal velocities keep close to the initial parameters. We also calculate the charge and current neutralization factors of the REB. Combined with envelope equations, we obtain the variations of beam envelopes, which agree well with the PIC simulations. However, both the energy loss and instabilities of the REB may lead to a low transport efficiency during long-range propagation. It is proved that decreasing the initial pulse length of the REB can avoid the influence of electron avalanche. Using parts of REB pulses to build a long-distance IFR in advance can improve the beam quality of subsequent pulses. Further, a long-distance IFR may contribute to the implementation of long-range propagation of the REB in space environment.

Keywords: ion-focused regime (IFR) charge neutralization electron avalanche relativistic electron beam (REB) particle-in-cell Monte Carlo collision (PIC-MCC)

Received: 07 October 2021
Revised: 28 December 2021
Accepted manuscript online: 12 January 2022

PACS:	41.85.Ja	(Particle beam transport)
	41.75.Ht	(Relativistic electron and positron beams)
	52.35.-g	(Waves, oscillations, and instabilities in plasmas and intense beams)
	42.65.Jx	(Beam trapping, self-focusing and defocusing; self-phase modulation)

Fund: Project supported by the Joint Funds of the National Natural Science Foundation of China (Grant Nos. 61372050 and U1730247).

Corresponding Authors: Bi-Xi Xue
E-mail: xuebx@ncepu.edu.cn

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Jian-Hong Hao(郝建红), Bi-Xi Xue(薛碧曦), Qiang Zhao(赵强), Fang Zhang(张芳), Jie-Qing Fan(范杰清), and Zhi-Wei Dong(董志伟) Ion-focused propagation of a relativistic electron beam in the self-generated plasma in atmosphere 2022 Chin. Phys. B 31 064101

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