一种新型、紧凑、高效电子直线加速器加速管的设计研究

对一个新型、紧凑、高效的电子直线加速器的加速管的设计,进行了等阻抗与等梯度两种结构的比较研究.对于使用一个5MW速调管的能量和相位经过选择的用毕束流注入到两种加速管的情况应用Parmela程序进行了模拟计算.说明宜于加工和调试的等阻抗加速管更为适宜.最后,简单地讨论了如用更高功率(如30MW?,相应加速能量约为30MeV)的速调管用毕束流作为这种新型加速器的注入束时,等阻抗加速结构除了在设计、加工、调试中的简单易行外,同时模拟结果表明整个加速管无需外加横向聚焦磁场.

Design of Accelerating Structure on a Novel Compact Electron Linac

This paper mainly discusses what type of accelerating structure should be chosen for a novel compact electron linac (NCEL for short). After simulation of dynamics process in this linac with Parmela program,we get to the point that it is better on the whole,to choose constant impedance accelerating structure than constant gradient accelerating structure on the NCEL of 10MeV class.In this NCEL,the spent beam of a high power klystron amplifier is used for injecting into an accelerator section and the klystron works in self excited mode of operation. In this paper,the simulations of dynamics process,when the spent beam of a high power 5MW klystron is injected into a constant gradient structure and a constant impedance structure,are carried out. By comparing the output beam performances of these two kinds of structures,one can draw the conclusion that from overall consideration,it will be better to equip the NCEL with constant impedance structure than constant gradient structure,especially when the spent beam of much higher power klystron is used. At the same time the result of simulation indicates that it is unnecessary to use focusing coils around accelerating section,and thus the design will be further simplified for the NCEL.