Abstract: The fring field effect and the nonlinear property of particles of radial sector cyclotrons which are four-folded symmetrical are analyzed numerically. The result shows that the fring effect of magnetic field is obvious, and the nonlinear property of beam dynamics can be neglected in the smaller radial region.

摘要： 本文对四度对称径向扇回旋加速器的边缘场效应和粒子的非线性特征进行了数值分析;结果表明,在加速器的小半径区域,束流动力学表现出了明显的边缘场效应和相当程度的非线性特征。