High-energy quasi-monoenergetic proton beam from micro-tube targets driven by Laguerre–Gaussian lasers

Author:

Jin SORCID,Yao Y L,Lei B FORCID,Chen G YORCID,Zhou C T,Zhu S P,He X T,Qiao BORCID

Abstract

Abstract High-energy proton beams with low energy spread and angular divergence are highly valuable in various applications, such as proton therapy, ultrafast science, and nuclear physics. Laser-driven ion sources are being explored as a more compact and cost-effective alternative to conventional accelerators. However, producing high-quality proton beams using lasers has been a significant challenge. In this study, we propose a novel approach to achieve high-energy quasi-monoenergetic proton beams by utilizing a Laguerre–Gaussian (LG) laser to irradiate a solid hollow tube target. Our three-dimensional particle-in-cell simulations demonstrate that the LG laser efficiently pulls out and accelerates electrons. As these electrons exit the rear side of the tube, a charge-separation electric field for proton acceleration is self-established. Meanwhile, a considerable part of the electrons are confined to the laser axis by the ponderomotive force of the LG laser, generating a longitudinal bunching field and transverse focusing field. As a result, protons are accelerated and focused in these fields, producing a high- quality proton beam with high energy (247 MeV) and low energy spread (∼2%) using an LG laser with an intensity of 1.9 × 10 21 W cm−2 and a tube target with an electron density of 40nc . In comparison to a standard Gaussian laser, the LG laser exhibits superior performance in terms of proton cut-off energy, energy spread, and angular divergence.

Funder

National Natural Science Foundation of China

National Key R&D Program of China

the Strategic Priority Research Program of the Chinese Academy of Sciences

the Science and Technology on Plasma Physics Laboratory

Publisher

IOP Publishing

Subject

General Physics and Astronomy

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