X-波段轴耦合驻波电子直线加速管物理设计与研究

PHYSICAL DESIGN AND STUDY ON X BAND SW ON AXIS ELECTRON LINAC

为发展结构更加紧凑的小型电子直线加速器，进行了Ｘ－波段驻波电子直线加速结构的研究。采用π／２模轴耦合驻波加速结构，频率为９３００ＭＨｚ；不使用任何外加聚焦器件，应用交变相位聚焦技术，使射频场在纵向聚束和加速的同时，实现横向聚焦。设计了工作频率为９３００ＭＨｚ、管长约１５０ｍｍ的２ＭｅＶ轴耦合驻波电子直线加速管，给出了加速管物理设计参数。热测出束实验，馈入微波功率０．６８ＭＷ，负角注入１７ｋｅＶ电子束，得到脉冲流强＞９０ｍＡ、能量达２．４ＭｅＶ的电子束，俘获效率好于３０％，出口束靶点直径＜１．４ｍｍ。

An X band, on axis, standing wave electron accelerating structure has been developed to provide highly portable sources of X rays and neutrons for the therapy and radiography. The phase focusing technique is used. The design parameters of a 2 MeV, X band,on axis coupled, SW accelerating guide operated in the π/2 mode is described. A prototype 150 mm long structure has been machined, brazed and sealed. The beam tests have been finished.