磁偏转线圈的优化设计

本文由谢志行等(1987)给出的场参数表达式,借助正交设计法,对带屏蔽筒鞍形偏转线圈进行了优化设计,所得结果与实际模型相符。指出了鞍形偏转线圈的端耳效应和场参数B0(z)分布对象差的重要贡献。例示了有限长余弦分布绕组与分布式绕组之间电子光学性能的比较。

OPTIMIZATION OF THE MAGNETIC DEFLECTION SYSTEM

This is the second one of two papers about designing the saddle deflection yoke with 3 ferromagnetic shield. By using the expressions of the field parameters given by the author et al (1987) and with the aid of orthogonal design method, we optimized the design of the saddle deflection yoke with a ferromagnetic shield. The results obtained agree with the practical model. It is pointed out that the end-ear and the distribution of the field parameter B₀(z) have important effects on the deflection aberrations. An example is given that compares the electron optical properties of the deflection coils with cosine-distribution and finite length with that of the deflection coils with distributed winding.