新型闪光X射线二极管绝缘结构设计

Optimization Design for Insulating Structure of a Novel Flash x-ray Tube

小型脉冲X射线系统用于流体动力学实验和武器物理规律、常规武器设计等的研究,为研制较高性能的便携紧凑型闪光X射线二极管,介绍了冷阴极X射线二极管的工作原理;阐述了二极管绝缘结构设计原则;采用数字模拟计算辅助设计设计了一种新型的紧凑型轴向绝缘结构的X射线二极管并给出了设计参数。计算结果表明:二极管的工作场强低于真空闪络场强;所有三相点的工作场强均满足绝缘要求。通过模拟计算结果改进了结构设计以利于在狭小空间进行闪光照相。

The operating principle of the field-emission cold-cathode x-ray tube is described. A novel compact flash x- ray diode with vacuum insulator stack is designed. The design parameters including the dose, vacuum insulator stack, cathode and anode are described. The empirical formula and static simulation were introduced into the design of the x-ray diode with vacuum insulator stack. Static simulation results show that the highest operating field strength of the diode is 62 kV/cm under the empirical data 80 kV/cm; but the highest operating field strength of all the triple point is 46.3 kV/cm, higher than the empirical strength 30 kV/em. The simulation results help to improve the initial design. And the highest operating field strength of all the triple point is 23.2 kV/cm, less than the empirical strength 30 kV/cm. So the design is feasible. The cubage of the tube is small and the high vacuum will be got very quickly. The tube can be demountabie and can be used in narrow space far away the pulse forming line.