Control of beam halo-chaos by sample function |
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Authors: | Bai Long Zhang Rong Weng Jia-Qiang Luo Xiao-Shu and Fang Jin-Qing |
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Institution: | College of Science, China University of Mining and Technology, Xuzhou 221008, China; College of Physics and Information Technology, Guangxi Normal University, Guilin 541004, China; China Institute of Atomic Energy, Beijing 102413, China |
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Abstract: | The K-V beam through an axisymmetric uniform-focusing channel is studied
using the particle--core model. The beam halo-chaos is found, and a sample
function controller is proposed based on mechanism of halo formation and
strategy of controlling halo-chaos. We perform multiparticle simulation to
control the halo by using the sample function controller. The numerical
results show that our control method is effective. We also find that the radial
ion density changes when the ion beam is in the channel: not only can the
halo-chaos and its regeneration be eliminated by using the sample
function control method, but also the density uniformity can be found at the
beam's centre as long as an appropriate control method is chosen. |
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Keywords: | eam halo-chaos sample function radial ion density uniform-focusing channel |
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