中国物理B ›› 2006, Vol. 15 ›› Issue (6): 1226-1230.doi: 10.1088/1009-1963/15/6/016

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Control of beam halo-chaos by sample function

方锦清1, 翁甲强2, 罗晓曙2, 白龙3, 张荣3   

  1. (1)China Institute of Atomic Energy, Beijing 102413, China; (2)College of Physics and Information Technology, Guangxi Normal University, Guilin 541004, China; (3)College of Science, China University of Mining and Technology, Xuzhou 221008, China
  • 收稿日期:2005-07-10 修回日期:2006-03-07 出版日期:2006-06-20 发布日期:2006-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10247005 and 70071047) and the Scientific Research Foundation of China University of Mining and Technology for the Young (Grant No 2005A037).

Control of beam halo-chaos by sample function

Bai Long (白龙)a, Zhang Rong (张荣)a, Weng Jia-Qiang (翁甲强)b, Luo Xiao-Shu (罗晓曙)b, Fang Jin-Qing (方锦清)c    

  1. a College of Science, China University of Mining and Technology, Xuzhou 221008, China; b College of Physics and Information Technology, Guangxi Normal University, Guilin 541004, China; c China Institute of Atomic Energy, Beijing 102413, China
  • Received:2005-07-10 Revised:2006-03-07 Online:2006-06-20 Published:2006-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10247005 and 70071047) and the Scientific Research Foundation of China University of Mining and Technology for the Young (Grant No 2005A037).

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摘要： 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.

关键词: eam halo-chaos, sample function, radial ion density, uniform-focusing channel

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.

Key words: eam halo-chaos, sample function, radial ion density, uniform-focusing channel

中图分类号:  (Numerical simulations of chaotic systems)

  • 05.45.Pq
05.45.Gg (Control of chaos, applications of chaos) 42.65.Jx (Beam trapping, self-focusing and defocusing; self-phase modulation)