高能电子直线加速器束流轨道校正的优化研究

Studies on the Optimum Beam Orbit Correction for High Energy Electron Linacs

为在高能直线加速器出口获得尽可能好的束流品质,严格控制束流在加速器中的轨道是至关重要的。首先定量研究了束流的初始偏轴和加速器部件的安装误差对束流轨道偏轴的影响,并以北京正负电子对撞机二期工程(BEPCII)的直线加速器为例,给出了上述各种误差导致轨道偏轴的模拟计算结果及其分析。进而讨论了BEPCII直线加速器轨道校正系统的设计研究,给出了轨道校正系统的优化布局和对加速器部件的安装公差要求。

In order to obtain a high quality beam at the exit of a high energy electron linear accelerator (Linac), seriously controlling on the beam orbit in the linac is greatly important. The beam orbit offset effects caused by the initial beam offset and the linac components' offsets have been quantitatively studied first. As an example with the injector linac for Beijing Electron Positron Collider upgrading project (BEPCII), the beam orbit offset caused by the above error effects have been simulated and analyzed. Then a design study on the optimum orbit correction system for BEPCII Linac is discussed. The optimum corrector's distribution and the required tolerances of misalignment of the linac components are given.