SIMULATION STUDIES OF TRANSVERSE RESONANCE EFFECTS IN SPACE-CHARGE-DOMINATED BEAMS

Particle-in-cell simulations exploring the effects of transverse envel ope resonances on the emittance of space-charge-dominated beams have b een carried out using a new 2-D transverse ''slice'' model in the WARP particle-in-cell code. In this paper, we consider resonances between an applied quadrupole field error and harmonics of the asymmetric mism atch mode of beam envelope oscillation. We examine both acceleration a nd bunching, and show that rapid passage through a major resonance sig nificantly reduces the attendant emittance growth. Published by Elsevi er Science B.V.