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Published Online: 26 October 2017
Accepted: September 2017

Ponderomotive beatwave ion acceleration using twisted light featured

Physics of Plasmas 24, 103131 (2017); https://doi.org/10.1063/1.5005093
Hossein Saberi1,a), Jorge Vieira2,a), and Luis O Silva2,a)
more...View Affiliations
Abstract
An all-optical mechanism of ion acceleration in vacuum with two counter-propagating plane waves has been proposed by F. Peano et al., IEEE Trans Plasma Sci. 36, 1857 (2008). A suitable frequency chirping of lasers drives a beat wave with variable phase velocity that traps particles and accelerates them longitudinally. In this paper, direct ion acceleration by two counter-propagating focused laser beams with variable frequencies is considered, and the multi-dimensional effects associated with the finite transverse dimension of lasers are investigated. It is shown that the Gaussian laser beams provide a defocusing transverse force that stops the acceleration process as ions propagate towards regions of smaller laser fields. On the other hand, the Laguerre-Gaussian laser beams with identical orbital angular momentum can confine the off-axis ions radially as they accelerate to high energies. It is shown that the orbital angular momentum of the Laguerre-Gaussian lasers can be used to control the angular momentum of the accelerated ion beam.

ACKNOWLEDGMENTS

This work was supported by the Institute for Research in Fundamental Sciences (IPM) and the epp/GoLP at Instituto Superior Técnico, Universidade de Lisboa. J.V. acknowledges the support of FCT (Portugal) Grant No. SFRH/IF/01635/2015.

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