Author :
Ball, M. ; Brabson, B. ; Budnick, J. ; Chu, C.M. ; Caussyn, D.D. ; Collins, J. ; Derenchuk, V. ; East, G. ; Ellison, M. ; Friesel, D. ; Fung, K.M. ; Hamilton, B. ; Hsi, W.C. ; Huang, H. ; Jones, W.P. ; Lee, S.Y. ; Li, D. ; Ng, K.Y. ; Pei, X. ; Riabko, A.
Author_Institution :
Indiana Univ., Bloomington, IN, USA
Abstract :
Experimental data on particle motion near the separatrix of the one dimensional (1-D) fourth-integer islands are analyzed. 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 betatron 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
Keywords :
particle beam bunching; particle beam extraction; 1D fourth-integer islands; beam bunch; beam extraction; beam motions; coherent betatron motion; homoclinic structure; modulated closed orbit; particle motion; particle tracking simulation; separatrix; strong decoherence; Analytical models; Apertures; Data mining; Equations; Laboratories; Optical modulation; Particle beams; Particle tracking; Resonance; Stochastic processes;
