论文标题
电荷的辐射穿过电介质球形靶标：射线光学和光圈方法
Radiation of charge moving through a dielectric spherical target: ray optics and aperture methods
论文作者
论文摘要
在介电目标存在下移动的带电颗粒的辐射对于加速器和梁物理中的各种应用具有重大关注。这些目标的大小通常比正在考虑的波长大得多。这个事实为我们提供了一个明显的问题，并允许开发近似方法进行分析。我们开发两种方法，称为“射线光学方法”和“孔径方法”。在本文中，我们将这些方法应用于分析Cherenkov辐射，从固体介电球中的真空通道移动的电荷。我们提出主要的分析结果并描述物理效应。特别是，表明辐射场在距离切伦科夫角的一定距离处具有表达最大值。此外，我们在COMSOL多物理学中进行模拟，并在数值和分析结果之间显示出良好的一致性。
Radiation of charged particles moving in the presence of dielectric targets is of significant interest for various applications in the accelerator and beam physics. The size of these targets is typically much larger than the wavelengths under consideration. This fact gives us an obvious small parameter of the problem and allows developing approximate methods for analysis. We develop two methods, which are called the "ray optics method" and the "aperture method". In the present paper, we apply these methods to analysis of Cherenkov radiation from a charge moving through a vacuum channel in a solid dielectric sphere. We present the main analytical results and describe the physical effects. In particular, it is shown that the radiation field possesses an expressed maximum at a certain distance from the sphere at the Cherenkov angle. Additionally, we perform simulations in COMSOL Multiphysics and show a good agreement between numerical and analytical results.
