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Phys Rev Lett. 2008 Oct 3;101(14):145002. Epub 2008 Sep 29.

Beam loading in the nonlinear regime of plasma-based acceleration.

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1
Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.

Abstract

A theory that describes how to load negative charge into a nonlinear, three-dimensional plasma wakefield is presented. In this regime, a laser or an electron beam blows out the plasma electrons and creates a nearly spherical ion channel, which is modified by the presence of the beam load. Analytical solutions for the fields and the shape of the ion channel are derived. It is shown that very high beam-loading efficiency can be achieved, while the energy spread of the bunch is conserved. The theoretical results are verified with the particle-in-cell code OSIRIS.

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