Fluctuations Do Matter: Large Noise-Enhanced Halos in Charged-Particle Beams

Abstract

The formation of beam halos has customarily been described in terms of a particle-core model in which the space-charge field of the oscillating core drives particles to large amplitudes. This model involves parametric resonance and predicts a hard upper bound to the orbital amplitude of the halo particles. We show that the presence of colored noise due to space-charge fluctuations and/or machine imperfections can eject particles to much larger amplitudes than would be inferred from parametric resonance alone.

13 pages total, including 5 figures

References in corpus (2)

• Noise-Induced Phase Space Transport in Two-Dimensional Hamiltonian Systems
• Chaotic Orbits in Thermal-Equilibrium Beams: Existence and Dynamical Implications

Cited by in corpus (5)

• Exact numerical simulation of power-law noises
• Production of Enhanced Beam Halos via Collective Modes and Colored Noise
• Noise-Enhanced Parametric Resonance in Perturbed Galaxies
• Increasing charge lifetime in DC polarized electron guns by offsetting the anode
• New version of PLNoise: a package for exact numerical simulation of power-law noises