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Collimated proton beams by ultra-short, ultra-intense laser pulse interaction with a foil–ramparts target

Published online by Cambridge University Press:  29 October 2015

Huan Wang ,
Lihua Cao  and
X.T. He
Huan Wang
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing 100871, China Institute of Plasma Physics and Fusion, Peking University, Beijing 100871, China Key Laboratory of High Energy Density Physics Simulation (HEDPS) of the Ministry of Education, Peking University, Beijing 100871, China
Lihua Cao*
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing 100871, China Key Laboratory of High Energy Density Physics Simulation (HEDPS) of the Ministry of Education, Peking University, Beijing 100871, China Institute of Applied Physics and Computational Mathematics, Beijing 100088, China IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
X.T. He
Affiliation:
Center for Applied Physics and Technology, Peking University, Beijing 100871, China Key Laboratory of High Energy Density Physics Simulation (HEDPS) of the Ministry of Education, Peking University, Beijing 100871, China Institute of Applied Physics and Computational Mathematics, Beijing 100088, China Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China
*
Address correspondence and reprint requests to: Lihua Cao and X.T. He, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China. E-mail: [email protected] and [email protected]
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Abstract

A foil–ramparts target interaction with an ultra-short, ultra-intense laser pulse (pulse duration between 10−12 and 10−15 s, intensity above 1018 W cm−2) to produce proton beams with controlled divergence and concentrated energy density in target normal sheath acceleration regime is studied. Two-dimension-in-space and three-dimension-in-velocity particle-in-cell simulations show that the foil–ramparts target helps to reshape the sheath electric field and generate a transverse quasi-static electric field of ~6.7 TV m−1 along the inner wall of the ramparts. The transverse electric field suppresses the transverse expansion of the proton beam effectively, as it tends to force the produced protons to focus inwards to the central axis, resulting in controlled divergence and concentrated energy density compared with that of a single plain target. The dependence of proton beam divergence on length of the rampart h is investigated in detail. A rough estimation of h ranges depending on dimensionless parameter a0 of the incident laser is also given.

Keywords

Foil–ramparts targetProton beamsTNSAParticle-in-cell (PIC)Controlled divergence
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 4 , December 2015 , pp. 765 - 771
Copyright
Copyright © Cambridge University Press 2015 

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