Beam motions near separatrix

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

Volume

3

fYear

1999

fDate

1999

Firstpage

1548

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.794169

Filename

794169