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

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

2003-05-31

arxiv.org/abs/physics/0306004v1

Phys.Rev.Lett. 91 (2003) 264801

Physics

Accelerator Physics

13 pages total, including 5 figures

Scientific paper

10.1103/PhysRevLett.91.264801

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.

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