Focus and Aberrations of Nuclear Microprobe (FANM) is a new beam optics package to achieve fast and accurate design of a nuclear microprobe. FANM achieves a balance between speed of focusing and accuracy of high order aberrations. A combined method proposed in FANM is to achieve focusing conditions using a matrix method and to calculate aberration coefficients using a numerical ray tracing method. FANM has two optional optimization algorithms (derivative-free method and particle swarm optimization), offering a powerful choice for multi-variable optimization. Numeric variables in FANM are stored as 64-bit (8-byte) double-precision floating-point values to reduce calculation errors. Results obtained with FANM are compared with six existing computational tools (PRAM, TRANSPORT-PSI, TRANSPORT-PBO, WinTRAX, GEANT4-nanobeam and Zgoubi). The reasons for discrepancies between the different packages are discussed. Calculated currents of magnetic quadrupole lenses obtained with FANM are compared with experimental values of a nuclear microprobe in the National University of Singapore.

中文翻译：

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FANM：用于核微探针聚焦和像差的软件

核微探针的聚焦和像差 (FANM) 是一种新的光束光学套件，可实现核微探针的快速准确设计。FANM 实现了对焦速度和高阶像差精度之间的平衡。FANM 中提出的一种组合方法是使用矩阵方法获得聚焦条件并使用数值光线追踪方法计算像差系数。FANM 有两种可选的优化算法（无导数法和粒子群优化），为多变量优化提供了强大的选择。FANM 中的数值变量存储为 64 位（8 字节）双精度浮点值以减少计算错误。使用 FANM 获得的结果与六种现有计算工具（PRAM、TRANSPORT-PSI、TRANSPORT-PBO、WinTRAX、GEANT4-nanobeam 和 Zgoubi）进行了比较。讨论了不同包之间差异的原因。用 FANM 获得的磁性四极透镜的计算电流与新加坡国立大学核微探针的实验值进行了比较。