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Electron trapping and acceleration in plasma wake field produced by an evolving hollow electron beam

Published online by Cambridge University Press:  01 February 2021

Xiangyang Liu ,
Junfan Qu ,
Peng Liu ,
Houchen Fan ,
Ling Cai ,
Feng Zhang ,
Qin Yu ,
Xiaofeng Li ,
Linwen Zhang  and
Qing Kong Open the ORCID record for Qing Kong [Opens in a new window]
Xiangyang Liu
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China Institute of Fluid Physics, CAEP, Mianyang621900, PR China
Junfan Qu
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China
Peng Liu
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China
Houchen Fan
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China
Ling Cai
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China
Feng Zhang
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China
Qin Yu
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Shanghai201800, PR China
Xiaofeng Li
Affiliation:
Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, PR China Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai200240, PR China
Linwen Zhang
Affiliation:
Institute of Fluid Physics, CAEP, Mianyang621900, PR China
Qing Kong*
Affiliation:
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai200433, PR China
*
†Email address for correspondence: qkong@fudan.edu.cn
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Abstract

In this article, the electron trapping and acceleration in the wake field driven by an ultrarelativistic hollow electron beam is studied. When the hollow driver injects into plasma, there is a doughnut-shaped electron bubble formed because of the existence of a special ‘backflow’ beam in the centre of the electron bubble. At the same time, there is a transverse convergence of the hollow driver, which leads to the weakening of the backflow beam. This results in a local electron density transition at the rear of the bubble. During this process, there is an expansion of the longitudinal electron bubble size, and a bunch of background electrons is trapped by the wake field at the rear of the bubble. The tracks for the trapped electrons show that there are two sources: one is from the bubble sheath and the other is from the unique backflow beam. In the particle-in-cell simulation where the driving beam has initial energy of $1.0$ GeV per particle, the trapped beam can be accelerated to energy of more than $1.5$ GeV per particle and the corresponding transformer ratio is $1.5$. With the increase of driving beam energy up to $40.0$ GeV, a transformer ratio of $1.4$ still can be achieved. By adjusting the hollow beam density, it is possible to control the trapped beam charge value and beam quality, such as its energy spread and transverse emittance.

Keywords

plasma applicationsplasma simulation
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 1 , February 2021 , 905870104
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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