Angular momentum oscillation in spiral-shaped foil plasmas

Weifeng Gong; Baifei Shen; Lingang Zhang; Xiaomei Zhang

doi:10.1088/1367-2630/ab150a

New Journal of Physics (Jan 2019)

Angular momentum oscillation in spiral-shaped foil plasmas

Weifeng Gong,
Baifei Shen,
Lingang Zhang,
Xiaomei Zhang

Affiliations

Weifeng Gong: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of China
Baifei Shen: ORCiD; State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China; Department of Physics, Shanghai Normal University , Shanghai, 200234, People’s Republic of China
Lingang Zhang: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
Xiaomei Zhang: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China

DOI: https://doi.org/10.1088/1367-2630/ab150a
Journal volume & issue: Vol. 21, no. 4
p. 043022

Abstract

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Two types of spiral-shaped foils are investigated for generating significant angular momentum (AM) in plasmas by reflecting a relativistic Gaussian pulse into a vortex laser beam with the same topological charge. This is the first time to find that AM oscillation exists in specific spiral-shaped foils during laser-plasma interaction, while AM oscillation is not observed in other types of foils. Both three-dimensional particle-in-cell simulations and theoretical results have confirmed this finding. AM oscillation is demonstrated to be induced by the asymmetric field on the foil surface, and this asymmetric field can be modulated in order to strengthen or weaken the oscillation amplitude by redesigning the foil surface. AM oscillation is expected to bring insight into radiation, particle heating and other mechanisms with AM effects.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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