Minimization of transverse beam-emittance growth in the 90-degree bending section of the RAON rare-isotope accelerator

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• 作者：B. H. Oh ; M. Yoon
• 关键词：Heavy ; ion accelerator ; Genetic algorithm ; Emittance growth ; Simplex
• 刊名：Journal of the Korean Physical Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：69
• 期：10
• 页码：1523-1530
• 全文大小：
• 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
• 出版者：The Korean Physical Society
• ISSN：1976-8524
• 卷排序：69

文摘

The major contribution of the transverse beam emittance growth (EG) in a RAON heavy-ion accelerator comes from the bending section, which consists of a charge-stripping section, a matching section, and a charge-selection section in sequence. In this paper, we describe our research to minimize the two-dimensional EG in the 90-degree bending section of the RAON currently being developed in Korea. The EG minimization was achieved with the help of multi-objective genetic algorithms and the simplex method. We utilized those algorithms to analyze the 90-degree bending section in a driver linac for the in-flight fragmentation system. Horizontal and vertical EGs were limited to below 10 % in the bending section by adjustment of the transverse beam optics upstream from the charge-stripping section, redesign of the charge-selection section, and optimization of the vertical beam optics at the entrance of a charge-selection section.