Theory of longitudinal beam halo in RF linacs. II. Envelope-particle resonances

Author

Lund, Steven M. ; Barnard, John J.

Author_Institution

Lawrence Livermore Nat. Lab., CA, USA

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1932

Abstract

For pt.I see ibid., p.1929 (1998). Using the core/test-particle model described in a companion paper, we analyze longitudinal beam halo produced by resonant self-field interactions in intense, ion-beam RF linacs. It is shown that particles moving in the presence of the space-charge forces of an oscillating, mismatched ellipsoidal beam bunch can be resonantly driven to large longitudinal amplitude. This resonantly produced halo is first analyzed in a limit where it is most simply understood, with particles moving purely longitudinally and with linear RF focusing. Then modifications of the resonance induced by nonlinear RF and transverse-longitudinal coupling are explored

Keywords

ion accelerators; linear accelerators; particle beam dynamics; particle beam focusing; RF linac; core/test-particle model; ion linac; linear RF focusing; longitudinal beam halo; mismatched ellipsoidal beam bunch; nonlinear RF; resonant self-field interactions; space-charge forces; transverse-longitudinal coupling; Equations; Focusing; Laboratories; Linear accelerators; Optical coupling; Orbits; Particle beams; Physics; Radio frequency; Resonance;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.751065

Filename

751065