| High-intensity accelerator plays an important role in the production of nuclear materials, transmutation of radioactive wastes, heavy ion fusion, higher-energy physics, nuclear science and some high-tech industries. In particular, high-current accelerator driven clean activity nuclear power systems for various applications as energy resources has been one of the most focusing issues in the current research, because it provides a safer, cleaner and cheaper nuclear energy resource, which has a great significance to the energy challenges facing by most of the countries in21st century. However, beam halo-chaos has become one of the biggest difficulties in the applications of high-intensity accelerators. So, it has a great value in theory and practice on the research of the halo-chaos and the controlling.Based on the generation mechanism and control strategy of the halo-chaos, the dynamics characteristics of the particles which exhabit the K-V initial distribution in the periodic focusing channels has been detailed analysised.with the the particle core model. Also, the parameters in the halo-chaos system and the influence of the resonance-chaos of the beam envelope have been studyed. Finally, beam envelope and the particle spatial distribution has been calculated and controlled with the method of back-stepping design feedback control method and simple function nonlinear feedback control method.The feedback controller for back-stepping design applys derectly on the beam envelope equation by which control the mismatch raidus. And it has been found that the chaotic behavior of the beam envelope can be restrained effectively by conparing the Poincare section picturesThe simple function nonlinear feedback controllor will act on the radial electric filed force by which control the radial scatter of the particle.With the Matlab, it can be concluded that this method has a good control effect on the halo-chaos after observing the distribution by adding feedback particles. |
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