Space-charge driven emittance growth in a 3D mismatched anisotropic beam

Journal Article · Wed Jun 11 04:00:00 EDT 2003 · APS Physical Review Letters

DOI:https://doi.org/10.1109/PAC.2003.1289778· OSTI ID:834890

Qiang, Ji ^[1]; Ryne, Robert D; Hofmann, Ingo

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1. LBNL Library

We investigate the phenomenon of space-charge driven emittance growth in a three-dimensional mismatched anisotropic charged particle beam with relevance to high-intensity linear accelerators. The final emittance growth can be understood as a superposition of the contributions from the mismatch-induced halo formation and from the anisotropy-induced energy exchange. The averaged emittance growth per degree of freedom is bounded from above by the so-called ''free energy limit'' extended by the contributions from energy exchange. The partition of the growth into longitudinal or transverse is, however, a strong function of the tune ratio including the possibility that an initially equipartitioned beam is even driven substantially away from equipartition. The growth of the beam halo extent is dominated by the effect of mismatch, whereas anisotropy itself generates practically no halo.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of High Energy Physics, Office of Advanced Scientific Computing; Scientific Discovery through Advanced Computing Project (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 834890
• Report Number(s): LBNL--51807-Journal
• Journal Information: APS Physical Review Letters, Journal Name: APS Physical Review Letters Journal Issue: 17 Vol. 92
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ANISOTROPY
CHARGED PARTICLES
ENERGY TRANSFER
LINEAR ACCELERATORS
SPACE CHARGE
SPACE-CHARGE ANISOTROPIC BEAM HALO FORMATION BEAM HALO