Beam Motions Near Separatrix

Michael Ball,B B Brabson,J I Budnick,C M Chu,D D Caussyn,J H Collins,V Derenchuk, G East,M A Ellison,D L Friesel,King Man Fung,B Hamilton, W C Hsi, Hongwei Huang,W P Jones,S Y Lee, Dawei Li, K Y Ng,Xin Pei,A Riabko, T Slaon

ieee particle accelerator conference（1999）

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摘要

Experimental data on particle motion near the separatrix of the one dimensional (1-D) fourth-integer islands are an- alyzed. When the beam bunch is initially kicked to the separatrix orbit, we observed a strong decoherence in the coherent betatron motion. We find that, through intensive particle tracking simulation analysis, the decoherence has resulted from the beam being split into beamlets in the beta- tron phase space. However, we also observe an unexpected recoherence of coherence signal, which may result form a modulated closed orbit or the homoclinic structure near the separatrix.

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关键词

separatrix,physics,particle accelerators,particle motion,resonance,phase space,oscillations,stochastic processes,apertures,data mining

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