Phys. Rev. Lett. 91, 264801 (2003) [4 pages]Fluctuations Do Matter: Large Noise-Enhanced Halos in Charged-Particle BeamsReceived 31 May 2003; revised 24 July 2003; published 30 December 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.264801
DOI:
10.1103/PhysRevLett.91.264801
PACS:
29.17.+w, 29.27.Bd, 41.75.–i
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