Title :
Space-charge driven emittance growth in a 3D mismatched anisotropic beam
Author :
Qiang, J. ; Ryne, R.D. ; Hofmann, I.
Author_Institution :
Lawrence Berkeley Nat. Lab., CA, USA
Abstract :
In this paper we present a 3D simulation study of the emittance growth in a mismatched anisotropic beam. The equipartitioning driven by a 4th order space-charge resonance can be significantly modified by the presence of mismatch oscillation and halo formation. This causes emittance growth in both the longitudinal and transverse directions which could drive the beam even further away from equipartition. The averaged emittance growth per degree of freedom follows the upper bound of the 2D free energy limit plus the contributions from equipartitioning.
Keywords :
particle beam dynamics; particle beams; space charge; 2D free energy limit; 3D mismatched anisotropic beam; 3D simulation; 4th order space-charge resonance; equipartitioning; fourth order space-charge resonance; halo formation; mismatch oscillation; space-charge driven emittance growth; Anisotropic magnetoresistance; Convergence of numerical methods; Ear; Lattices; Linear particle accelerator; Optical coupling; Particle beams; Resonance; Resonant frequency; Temperature;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289778
