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Controlling Beam Halo-Chaos |
| FANG Jin-Qing1;LUO Xiao-Shu2;CHEN Guan-Rong3;WENG Jia-Qiang2 |
| 1China Institute of Atomic Energy, P. O. Box 275-27, Beijing 102413
2Department of Physics and Electronic Science, Guangxi Normal University, Guilin 541004
3Department of Electronic Engineering, City University of Hong Kong, Hong Kong |
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| Cite this article: |
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FANG Jin-Qing, LUO Xiao-Shu, CHEN Guan-Rong et al 2001 Chin. Phys. Lett. 18 1554-1557 |
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Abstract Beam halo-chaos is essentially a complex spatiotemporal chaotic motion in a periodic-focusing channel of a high-power 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 halo-chaos. Particles-in-cell simulations are used to explore the nature of halo-chaos formation, which has shown that the beam halo-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% 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.
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| Keywords:
05.45.+b
41.85-p
29.27.Bd
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Published: 01 December 2001
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