Beam Loading in the Nonlinear Regime of Plasma-Based Acceleration

Abstract

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M. Tzoufras,¹ W. Lu,¹ F. S. Tsung,² C. Huang,² W. B. Mori,^1,2 T. Katsouleas,³ J. Vieira,⁴ R. A. Fonseca,⁴ and L. O. Silva⁴
¹Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA
²Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
³Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA
⁴GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, 1049-001 Lisboa, Portugal

Received 15 March 2008; published 29 September 2008

Atheory that describes how to load negative charge into anonlinear, three-dimensional plasma wakefield is presented. In this regime, alaser or an electron beam blows out the plasma electronsand creates a nearly spherical ion channel, which is modifiedby the presence of the beam load. Analytical solutions forthe fields and the shape of the ion channel arederived. It is shown that very high beam-loading efficiency canbe achieved, while the energy spread of the bunch isconserved. The theoretical results are verified with the particle-in-cell codeOSIRIS.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.101.145002
DOI:	10.1103/PhysRevLett.101.145002
PACS:	52.38.Kd; 52.40.Mj; 52.65.Rr 52.38.Kd Laser-plasma acceleration of electrons and ions 52.40.Mj Particle beam interactions in plasmas 52.65.Rr Particle-in-cell method (plasma simulation) YEAR: 2008