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.