Evaluation of the electron transport algorithm in magnetic field in EGS5 Monte Carlo code
Evaluation of the electron transport algorithm in magnetic field in EGS5 Monte Carlo code
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DOI：
10.1016/j.ejmp.2021.12.001
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发表时间：
2022-01-01
影响因子：
3.4
通讯作者：
Jingu, Keiichi
中科院分区：
文献类型：
--
作者：
Ito, Kengo;Kadoya, Noriyuki;Jingu, Keiichi
目的：通过使用特殊的法诺腔测试来评估电子伽玛簇射版本5（EGS5）磁场中电子传输的准确性。方法：为了模拟磁场中的电子输运，用短步长重建电子轨迹以限制能量损失部分，并将最大用户步长（mxustep）设置为0.01 cm或0.001 cm。对于特殊的 Fano 腔测试，采用三层板 Fano 测试几何结构，在 0.35 T 和 1.5 T 范围内，允许来自几何结构中心轴的均匀且各向同性的单位质量单能电子（0.01、0.1、1.0 和 10 MeV）。此外，磁场强度根据材料的质量密度进行缩放。评估计算出的间隙剂量与理论值之间的相对差异。此外，还使用EGSnrc在相同条件下用电子增强电场和磁场宏进行了特殊的Fano腔测试，并将结果与EGS5进行了比较。结果：无论参数设置如何，0.35 T 的偏差均在 0.3% 以内。在 1.5 T 中，使用 0.001 cm 作为 mxustep 获得了 0.3% 以内的稳定结果，但 10 MeV 除外。此外，除了 1.5 T 中 0.2 cm 间隙的 10 MeV 外，EGSnrc 的精度在 0.2% 以内。 结论：具有适当参数设置的 EGS5 能够实现与 EGSnrc 精度相似的磁场中的电子传输。
Purpose: To evaluate the accuracy of electron transport in the magnetic field of Electron Gamma Shower version 5 (EGS5) by using the special Fano cavity test. Methods: To simulate electron transport in the magnetic field, the trajectory of the electron was reconstructed with a short step length to restrict fractional energy loss, and the maximum user step length (mxustep) was set at 0.01 cm or 0.001 cm. For the special Fano cavity test, three-layer slab Fano test geometry was used, and uniform and isotropic per unit mass mono-energetic electrons with 0.01, 0.1, 1.0, and 10 MeV were permitted from the central axis of geometry in 0.35 T and 1.5 T. Furthermore, the magnetic field strength was scaled based on the mass density of the material. The relative difference between the calculated dose to gap and the theoretical value was evaluated. Furthermore, the special Fano cavity test was also performed using EGSnrc with the electronenhanced electric and magnetic field macros under the same conditions, and the results were compared with those of EGS5. Results: Deviations in 0.35 T were within 0.3% regardless of the parameter settings. In 1.5 T, stable results within 0.3% were obtained using 0.001 cm as the mxustep, except for one at 10 MeV. Further, the accuracy of EGSnrc was within 0.2%, except for 10 MeV for a 0.2-cm gap in 1.5 T. Conclusions: EGS5 with the appropriate parameter settings enable electron transport in magnetic fields similar with the accuracy of EGSnrc.