title: Energy transfer in nonequilibrium space-charge-dominated beams
abstract: Space-charge modes similar to those observed in recent experiments appear in simulations of nonequilibrium charged particle beams with anisotropy. The modes couple degrees of freedom, causing energy transfer and equipartitioning without halo formation in just a few betatron wavelengths. The rate depends on a single free parameter quantifying the space-charge intensity of the final state. Traditional stability analyses are shown not to apply to high-intensity laboratory beams originating with a large perturbation from equilibrium.
authors.affiliation: Institute for Plasma Research, University of Maryland, College Park, Maryland 20742, USA.
authors.initials: RA
authors.lastname: Kishek
authors.initials: PG
authors.lastname: O'Shea
authors.initials: M
authors.lastname: Reiser