Production of halo particles by collective mode excitations in high intensity charged particle beams

This paper examines the effects of self-consistent collective oscillations excited in a high-intensity ion beam on the motion of a test particle in the beam core. Even under ideal conditions, assuming a constant transverse focusing force (smooth focusing approximation), and perturbations about a uniform-density, constant-radius beam, it is found that collective mode excitations, in combination with the applied focusing force and the equilibrium self fields, can eject particles from the beam core to large radii