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Improvement of ion acceleration in radiation pressure acceleration regime by using an external strong magnetic field

Published online by Cambridge University Press:  07 June 2019

H. Cheng
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China
L. H. Cao*
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China Center of Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Peking University, Beijing 1000871, China IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai, 200240, China
J. X. Gong
Affiliation:
Center of Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Peking University, Beijing 1000871, China
R. Xie
Affiliation:
Center of Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Peking University, Beijing 1000871, China
C. Y. Zheng
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China Center of Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Peking University, Beijing 1000871, China IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai, 200240, China
Z. J. Liu
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China Center of Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Peking University, Beijing 1000871, China
*
Author for correspondence: Lihua Cao, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China. E-mail: cao_lihua@iapcm.ac.cn

Abstract

Two-dimensional particle-in-cell (PIC) simulations have been used to investigate the interaction between a laser pulse and a foil exposed to an external strong longitudinal magnetic field. Compared with that in the absence of the external magnetic field, the divergence of proton with the magnetic field in radiation pressure acceleration (RPA) regimes has improved remarkably due to the restriction of the electron transverse expansion. During the RPA process, the foil develops into a typical bubble-like shape resulting from the combined action of transversal ponderomotive force and instabilities. However, the foil prefers to be in a cone-like shape by using the magnetic field. The dependence of proton divergence on the strength of magnetic field has been studied, and an optimal magnetic field of nearly 60 kT is achieved in these simulations.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2019 

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