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测量电子反中微子静止质量的最灵敏的方法是测量氚的β谱。采用大面积源能在保持β谱仪高分辨率的情况下,显著提高谱仪的亮度。利用传输矩阵方法和轨迹跟踪方法,分别在二级近似和高级近似下研究了大面积源的静电补偿和几何修正。计算了面源和面源上等位线的理想形状,讨论了它们的圆柱面近似和圆弧近似。以中国原子能科学研究院中微子质量测量β谱仪的磁场参数的依据。给出了一个宽9.6cm高10.0cm的大面积源算例,采用大面积源能使谱仪的亮度提高两个量级以上,而分辨却只加大一倍多点。理论计算结果与实验结果符合 的很好。
The most sensitive method of measuring the quality of electronic antineutrinos is to measure the beta spectrum of tritium. Using a large area source can significantly improve the spectrometer’s brightness while maintaining the high resolution of the beta spectrometer. Using the transfer matrix method and the trajectory tracking method, the electrostatic compensation and geometric correction of large-area sources are studied under the second-order approximation and the high-order approximation respectively. The ideal shapes of equipotential lines on surface and surface are calculated, and their cylindrical approximations and arc approximations are discussed. The basis of measuring the magnetic field parameter of β-spectrometer with the neutrino mass of China Institute of Atomic Energy. A large area source sample of 9.6cm in width and 10.0cm in width is given. The use of a large area source can increase the brightness of the spectrometer by more than two orders of magnitude, but the resolution is only doubled. The theoretical calculation results are in good agreement with the experimental results.