M. Ball, B. Brabson, J. Budnick, C. Chu, D. Caussyn, J. Collins, V. Derenchuk, G. East, M. Ellison, D. Friesel, K. Fung, B. Hamilton, W. Hsi, H. Huang, W. Jones, S. Lee, D. Li, K. Ng, X. Pei, A. Riabko, T. Slaon
{"title":"Beam motions near separatrix","authors":"M. Ball, B. Brabson, J. Budnick, C. Chu, D. Caussyn, J. Collins, V. Derenchuk, G. East, M. Ellison, D. Friesel, K. Fung, B. Hamilton, W. Hsi, H. Huang, W. Jones, S. Lee, D. Li, K. Ng, X. Pei, A. Riabko, T. Slaon","doi":"10.1109/PAC.1999.794169","DOIUrl":null,"url":null,"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.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1999-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PAC.1999.794169","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
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.
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