摘要
Beam halo-chaos is essentially a complex spatiotemporal chaotic motion in a periodic-focusing channel of a highpower linear proton accelerator. The controllability condition for beam halo-chaos is analysed qualitatively. A special nonlinear control method, i.e. the wavelet-based function feedback, is proposed for controlling beam halochaos. Particle-in-cell simulations are used to explore the nature of halo-chaos formation, which has shown that the beam hMo-chaos is suppressed effectively after using nonlinear control for the proton beam with an initial full Gaussian distribution. The halo intensity factor Hav is reduced from 14%o to zero, and the other statistical physical quantities of beam halo-chaos are more than doubly reduced. The potential applications of such nonlinear control in experiments are briefly pointed out.
作者
FANG Jin-Qing
LUO Xiao-Shu
CHEN Guan-Rong
WENG Jia-Qiang
方锦清;罗晓曙;陈关荣;翁甲强(China Institute of Atomic Energy,P.O.Box 275-27,Beijing 102413;Department of Physics and Electronic Science,Guangxi Normal University,Guilin 541004;Department of Electronic Engineering,City University of Hong Kong,Hong Kong)
基金
Supported by the National Natural Science Foundation of China under Grant Nos.19875080 and 70071047。
