Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.751065
