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本文采用有限差分方法对光电倍增管的聚焦系统的电场进行了计算，并对聚焦圆筒的长度进行了优化，得到了最佳收集效率的聚焦圆筒长度
In this paper, the finite difference method is used to calculate the electric field of the photomultiplier focusing system. The length of the focusing cylinder is optimized, and the focusing cylinder length with the best collection efficiency