一、引言 Linatron 400型直线加速器是工业上检测各种材料的内部结构和无损探伤的大型X射线照相设备之一,它由X射线加速器头、控制台、调节柜及互联蛇纹管和电缆等(图1所示)组成。其中,X射线加速器头包括:加速器射线中心线装配器、微波发生器、脉冲变压器、冷却系统和自动定位装置(见图2)。工作时,电子枪发射的电子束以一定初速度注入加速管 I. INTRODUCTION Linatron 400 linear accelerator is one of the large-scale X-ray equipment in the industry for detecting the internal structure and non-destructive testing of various materials. It consists of an X-ray accelerator head, a console, a regulating cabinet, interconnected bellows and cables (Shown in Figure 1). Among them, the X-ray accelerator head includes: accelerator ray center line assembly, microwave generator, pulse transformer, cooling system and automatic positioning device (see Figure 2). During operation, the electron beam emitted by the electron gun is injected into the accelerating tube at an initial velocity