弯转磁铁是电子储存环中重要部件之一.磁铁设计的核心问题是磁路设计和磁场设计.由于磁性材料的非线性特性、漏磁系数及边缘场效应无法准确计算,使磁路设计变得十分困难.而场形受磁铁材料,结构及极头形状等因素影响使其分布非常复杂,无法用简单的数学解析式精确计算.大容量的计算机虽能大大缩短计算时间,但一般设计精度也很难超过0.1%.一些参数必须从模型实验中得到.所 Curved magnets are one of the most important parts in the electronic storage ring.The core problem of the magnet design is the design of the magnetic circuit and the design of the magnetic field.Due to the non-linearity of the magnetic material, the leakage coefficient and the fringing field effect can not be accurately calculated, But the shape of the field is very complex due to the influence of magnet material, structure and polar shape, which can not be calculated by simple mathematical analysis.High capacity computer can shorten the calculation time greatly, but the general design accuracy It is also hard to exceed 0.1%. Some parameters must be obtained from the model experiment