Xiao Liling, Gai Wei, Sun Xiang
High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Jan;65(1 Pt 2):016505. doi: 10.1103/PhysRevE.65.016505. Epub 2001 Dec 19.
Recently, there has been some interest in planar or rectangular dielectric accelerating structures for future high-gradient linear accelerators. In this paper, we present a detailed analysis of the modes of a dielectric-loaded rectangular waveguide accelerating structure based on a circuit model approximation and mode matching method. In general, the acceleration field in a synchronous acceleration mode is nonuniform in the two transverse dimensions. We show, however, that by using a series of rectangular structures successively rotated by 90 degrees, the net accelerating force can be made almost uniform. Characteristic parameters such as R/Q, group velocity, and attenuation constant for X- and W-band accelerators are calculated. The longitudinal wakefields experienced by a relativistic charged particle beam in these structures are also presented. These analytical results are also compared with numerical calculations using the MAFIA code suite demonstrating the validity of our analytic approach.
最近，人们对用于未来高梯度直线加速器的平面或矩形介质加速结构产生了一些兴趣。在本文中，我们基于电路模型近似和模式匹配方法，对介质加载矩形波导加速结构的模式进行了详细分析。一般来说，同步加速模式下的加速场在两个横向维度上是不均匀的。然而，我们表明，通过依次使用一系列旋转90度的矩形结构，可以使净加速力几乎均匀。计算了X波段和W波段加速器的诸如R/Q、群速度和衰减常数等特征参数。还给出了相对论性带电粒子束在这些结构中所经历的纵向尾场。这些分析结果也与使用MAFIA代码套件的数值计算进行了比较，证明了我们分析方法的有效性。
