Jq. Fang et al., Physical mechanism of beam halo-chaos formation for high-current proton beam in a periodic-focusing channels and a nonlinear control strategy, PROG NAT SC, 11(1), 2001, pp. 6-15
The physical mechanism of the halo-chaos formation for a high intensity pro
ton beam in a periodic-focusing channel is analyzed using the transfer matr
ix theory and a qualitative analysis method. Particles-in-cell simulations
are further used to explore the mechanism of the beam halo-chaos formation,
which concerns not only with the nonlinear effect of the beam space charge
but also with the transverse energy exchange between the particles and the
particle-core, as well as the chaos generated by the nonlinear resonance o
verlap. A nonlinear control method is proposed for controlling. the halo-ch
aos. Simulation results show that the method is effective. Some potential a
pplications of the halochaos control in experiments are discussed.