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研究了带电粒子在射频四极透镜中的运动方程，导出了传输矩阵元，讨论了透镜聚焦特性和透镜各参数间的关系．
The equations of motion of charged particles in a radio frequency quadrupole lens are studied, the transfer matrix elements are derived, and the relationship between the lens focusing characteristics and the lens parameters is discussed.