Design of the gradient dipole magnet for LLICTF

Abstract The Lanzhou Light Ion Cancer Therapy Facility (LLICTF) is a compact medical accelerator currently under construction. It is designed to treat cancer using a 230 MeV, 30 mA H+ beam and a 85 MeV/u, 1 mA 3 He 2 + beam. The facility comprises two ion sources, a low-energy beam-transport (LEBT),...

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Published inJournal of physics. Conference series Vol. 2687; no. 6; pp. 62005 - 62011
Main Authors Chu, Yimeng, Wang, Zhijun, Huang, Junren, Chen, Weilong, Xu, Zhenyu, Liang, Zehua, Sun, Kunxiang
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2024
Subjects
Cancer
Design
Dipoles
Ion sources
Light ions
Quadrupoles
Space charge
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Summary:Abstract The Lanzhou Light Ion Cancer Therapy Facility (LLICTF) is a compact medical accelerator currently under construction. It is designed to treat cancer using a 230 MeV, 30 mA H+ beam and a 85 MeV/u, 1 mA 3 He 2 + beam. The facility comprises two ion sources, a low-energy beam-transport (LEBT), a Radio Frequency Quadrupole (RFQ), a medium-energy beam-transport (MEBT), and the main ring accelerating structure. Due to the presence of two ion sources, it is necessary to introduce a dipole magnet which is symmetrically focused as much as possible to meet the focusing requirements of the LEBT beam. Therefore, a gradient dipole magnet has been designed to achieve this symmetrical focusing. This paper discusses the theoretical and simulated symmetric focusing of the gradient dipole magnet. It also analyzes the effect of fringe fields and space charge. Additionally, this paper presents the results of the model design with CST and the multi-particle simulation results with TraceWin.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2687/6/062005