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研究设计了一种用于硼中子俘获治疗(BNCT)的紧凑型固定磁场交变梯度(FFAG)加速器。首先采用FFAG加速器磁铁的线性简化模型,计算确定了加速器的基本结构参数;再用WIN.AGILE程序进行了磁聚焦结构的设计和优化,得到了Beta函数、色散函数、包络函数及工作点等;采用MAD程序对设计结果进行了复算,并对两种程序的计算结果作了进一步的对比分析;最后采用ZGOUBI程序进行非线性磁场下粒子追踪。FFAG加速器的超周期为6,能量为11 MeV,场指数k为1.9,周长为11.1795 m,结构紧凑。分析结果表明,优化设计的FFAG加速器达到了预期的设计目标。
A compact fixed magnetic field alternating gradient (FFAG) accelerator for boron neutron capture therapy (BNCT) was designed and studied. Firstly, a linear simplified model of the FFAG accelerator magnet was used to calculate and determine the basic structural parameters of the accelerator. The design and optimization of the magnetic focusing structure were carried out by the WIN.AGILE program. The Beta function, dispersion function, envelope function and working point were obtained. The MAD program was used to reconstruct the design results and the results of the two programs were compared and analyzed. Finally, the ZGOUBI program was used to track the particles in the nonlinear magnetic field. The FFAG accelerator has a super-cycle of 6, an energy of 11 MeV, a field index k of 1.9 and a circumference of 11.1795 m, which is compact. The analysis shows that the FFAG accelerator has been designed to achieve the desired design goals.