Abstract

Laser-driven positron production is expected to provide a non-radioactive, controllable, radiation tunable positron source in laboratories. We propose a novel approach of positron production by using a femto-second laser irradiating a microstructured surface target combined with a high-Z converter. By numerical simulations, it is shown that both the temperature and the maximum kinetic energy of electrons can be greatly enhanced by using a microstructured surface target instead of a planar target. When these energetic electrons shoot into a high Z converter, copious positrons are produced via Bethe-Heitler mechanism. With a laser (wavelength λ = 1 μm) with duration ~36 fs, intensity ~5.5 × 1020 W/cm2 and energy ~6 Joule, ~109 positrons can be obtained.

Details

Title
Copious positron production by femto-second laser via absorption enhancement in a microstructured surface target
Author
Ye-Chen, Wang 1 ; Yin, Yan 1   VIAFID ORCID Logo  ; Wei-Quan, Wang 1 ; De-Bin, Zou 1 ; Wen-Xuan, Miao 1 ; Tong-Pu, Yu 2 ; Fu-Qiu, Shao 1 

1  Department of Physics, National University of Defense Technology, Changsha, China (GRID:grid.412110.7) (ISNI:0000 0000 9548 2110) 
2  Department of Physics, National University of Defense Technology, Changsha, China (GRID:grid.412110.7) (ISNI:0000 0000 9548 2110); Institute of Applied Physics and Computational Mathematics, Beijing, China (GRID:grid.418809.c) (ISNI:0000 0000 9563 2481) 
Publication year
2020
Publication date
2020
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-020-61964-6
ProQuest document ID
2386357644
Copyright
© The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.