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Spontaneous emergence of non-planar electron orbits during direct laser acceleration by a linearly polarized laser pulse

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Article number023111
<mark>Journal publication date</mark>02/2016
<mark>Journal</mark>Physics of Plasmas
Issue number2
Volume23
Number of pages9
Publication StatusPublished
Early online date16/02/16
<mark>Original language</mark>English

Abstract

An electron irradiated by a linearly polarized relativistic intensity laser pulse in a cylindrical plasma channel can gain significant energy from the pulse. The laser electric and magnetic fields drive electron oscillations in a plane making it natural to expect the electron trajectory to be flat. We show that strong modulations of the relativistic gamma-factor associated with the energy enhancement cause the free oscillations perpendicular to the plane of the driven motion to become unstable. As a consequence, out of plane displacements grow to become comparable to the amplitude of the driven oscillations and the electron trajectory becomes essentially three-dimensional, even if at an early stage of the acceleration it was flat. The development of the instability profoundly affects the x-ray emission, causing considerable divergence of the radiation perpendicular to the plane of the driven oscillations, while also reducing the overall emitted energy. (C) 2016 AIP Publishing LLC.