Beam halo in high-intensity beams

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Abstract
In space‐charge dominated beams the nonlinear space‐charge forces produce a filamentation pattern, which in projection to the 2‐D phase spaces results in a 2‐component beam consisting of an inner core and a diffuse outer halo. The beam‐halo is of concern for a next generation of cw, high‐power proton linacs that could be applied to intense neutron generators for nuclear materials processing. We describe what has been learned about beam halo and the evolution of space‐charge dominated beams using numerical simulations of initial laminar beams in uniform linear focusing channels. We present initial results from a study of beam entropy for an intense space‐charge dominated beam.

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