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Particle-in-cell simulations of the long proton beam focusing in background plasmas

Published online by Cambridge University Press:  08 April 2016

L.-Y. Zhang ,
X.-Y. Zhao ,
X. Qi ,
W.-S. Duan  and
L. Yang
L.-Y. Zhang
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China China Academy of Engineering Physics – Software Center for High Performance Numerical Simulation, Beijing 100088, China
X.-Y. Zhao
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
X. Qi*
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
W.-S. Duan
Affiliation:
Joint Laboratory of Atomic and Molecular Physics of NWNU & IMP CAS, Northwest Normal University, Lanzhou 730070, China
L. Yang*
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China Department of Physics, Lanzhou University, Lanzhou 730000, China
*
Address correspondence and reprint requests to: Xin Qi and Lei Yang, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and Department of Physics, Lanzhou University, Lanzhou 730000, China. E-mail: qixin2002@impcas.ac.cn and lyang@impcas.ac.cn
Address correspondence and reprint requests to: Xin Qi and Lei Yang, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and Department of Physics, Lanzhou University, Lanzhou 730000, China. E-mail: qixin2002@impcas.ac.cn and lyang@impcas.ac.cn
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Abstract

A two-dimensional particle-in-cell simulation is carried out to study the focusing effects of the long proton beam propagating in background plasmas. It is found that the smooth beam, with the long length and the small density gradient profile, is focused to high density. The sharp beam, with long length and the large density gradient profile, is modulated into many high density and periodic short beam pulses due to the wakefield induced by the beam. In addition, increasing the plasma density and adopting the non-uniform plasmas are the effective ways to reduce the wakefield.

Keywords

Beam–plasma interactionFocusing effectsParticle-in-cell
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 2 , June 2016 , pp. 299 - 305
Copyright
Copyright © Cambridge University Press 2016 

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