一种新型的变像管用复合聚焦-偏转系统

A novel combined focusing-deflection system for streak image tube

介绍了一种新型的多极式偏转器——8瓣状多极偏转器,它可通过将一旋转对称电极均匀开槽切割为8片而成。通过对圆周上各电极电位分布作傅里叶分析,获得了在其内部产生近乎均匀横向偏转场所需要的电极电位设置规律。由于其结构上的旋转对称性以及Laplace方程解的调和性,当在此8瓣偏转器各电极上同时叠加一聚焦透镜所需电位时,它所产生的场中多极场分量为16极场或者更多极场而不影响近轴区的聚焦效果,因而其能与常用的圆筒形电极相结合而形成复合聚焦-偏转系统。其具有的聚焦偏转特性也通过相关的定性分析得以验证。同时,这样结构上的优化也为变像管的小型化设计提供了可能性。

A novel multiple-electrode electrostatic deflector （petal-like） is introduced. It can be got by symmetrically slotting a cylindrical electrode into eight separate parts. The Fourier analysis of the potential distribution on the circumference of the electrode circle has elicited the principle for electrode potential settings to generate a nearly transversely-uniform deflecting field. Based on the rotational symmetry in its shape and the harmonicity of the solution of Laplace equation, multipole fields generated by the petal-like electrode would not affect the focusing property of the conventional electrostatic lens in the paraxial region, when the focusing potential additionally applied. Therefore, the introduced multiple-electrode petal-like defector can be combined with the commonly used cylindrical focusing electrode in a streak tube to form a combined focusing-deflection system, of which the focusing and deflecting properties have been verified by the related qualitative analysis. And the optimized system has provided the possibility for the miniaturization of streak tubes.