Longitudinal density modulation and energy conversion in intense beams

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J. R. Harris
Lawrence Livermore National Laboratory, Livermore, California 94551, USA

J. G. Neumann
Naval Research Laboratory, Washington, DC 20379, USA

K. Tian and P. G. O'Shea
Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20740, USA

Received 7 August 2006; revised 27 March 2007; published 8 August 2007

Densitymodulation of charged particle beams may occur as a consequenceof deliberate action, or may occur inadvertently because of imperfectionsin the particle source or acceleration method. In the caseof intense beams, where space charge and external focusing governthe beam dynamics, density modulation may, under some circumstances, beconverted to velocity modulation, with a corresponding conversion of potentialenergy to kinetic energy. Whether this will occur depends onthe properties of the beam and the initial modulation. Thispaper describes the evolution of discrete and continuous density modulationson intense beams and discusses three recent experiments related tothe dynamics of density-modulated electron beams.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.76.026402
DOI:	10.1103/PhysRevE.76.026402
PACS:	52.59.Sa; 41.75.Fr; 71.45.Lr; 52.35.Lv 52.59.Sa Space-charge-dominated particle beams in plasmas 41.75.Fr Electron and positron beams 71.45.Lr Charge-density-wave systems 52.35.Lv Other plasma linear waves YEAR: 2007
KEYWORDS:	space charge waves, particle beam focusing

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