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Ion jet generation in the ultraintense laser interactions with rear-side concave target

Published online by Cambridge University Press:  17 June 2010

Bin Liu
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing, People's Republic of China Graduate School, China Academy of Engineering Physics, Beijing, People's Republic of China
Hua Zhang
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing, People's Republic of China Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Li-Bin Fu
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing, People's Republic of China Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Yu-Qiu Gu
Affiliation:
Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang, Sichuan Province, People's Republic of China
Bao-Han Zhang
Affiliation:
Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang, Sichuan Province, People's Republic of China
Ming-Ping Liu
Affiliation:
School of Information Engineering, Nanchang University, Nanchang, People's Republic of China
Bai-Song Xie
Affiliation:
College of Nuclear Science and technology, Beijing Normal University, Beijing, People's Republic of China
Jie Liu*
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing, People's Republic of China Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Xian-Tu He
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing, People's Republic of China Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
*
Address correspondence and reprint requests to: Jie Liu, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China. E-mails: liu_jie@iapcm.ac.cn; steelan_liu@yahoo.com

Abstract

In this paper, the ion jet generation from the interaction of an ultraintense laser pulse and a rear-side concave target is investigated analytically using a simple fluid model. We find that the ion expanding surface at the rear-side is distorted due to a strong charge-separation field, and that this distortion becomes dramatic with a singular cusp shown on the central axis at a critical time. The variation of the transverse ion velocity and the relative ion density diverge on the cusp, signaling the emergence of an on-axis ion jet. We have obtained analytical expressions for the critical time and the maximum velocity of the ion jet, and suggested an optimum shape for generating a collimated energetic ion jet. The above theoretical analysis has been verified by particle-in-cell (PIC) numerical simulations.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2010

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