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The weakened Weibel instability of collimated fast electron beam in nanotube array

Published online by Cambridge University Press:  20 January 2017

L. Liao
Affiliation:
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, People's Republic of China
R. Zhao*
Affiliation:
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, People's Republic of China
Y. Bie
Affiliation:
Nuclear and Radiation Safety Center, MEP, Beijing 100082, People's Republic of China
H. Zhang
Affiliation:
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, People's Republic of China
C. Hu
Affiliation:
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, People's Republic of China
*
Address correspondence and reprint requests to: R. Zhao, School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, People's Republic of China. E-mail: rqzhao@cqjtu.edu.cn

Abstract

The Weibel instability of the collimated MeV fast electron beams in a nanotube array target is researched in this work. It is found that the filamentation of the fast electrons is significantly suppressed. When fast electrons propagate the nanotube array, a strong magnetic field is created near the surface of tubes to obstruct the transverse movement of the fast electrons and bend them into the inner vacuum spaces between the successive tubes. In consequence, the positive feedback loop between the magnetic field perturbation and the electrons density perturbation is broken and the Weibel instability is thus weakened. Furthermore, the calculated results by a hybrid particle-in-cell code have also proven this weakening effect on the Weibel instability. Because of the high-energy density delivered by the MeV electrons, these results indicate some significant applications in the high-energy physics, such as radiography, fast-electron beam focusing, and perhaps fast ignition.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2017 

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