Fast readout algorithm for cylindrical beam position monitors providing good accuracy for particle bunches with large offsets

Energy Spectra from Electromagnetic Fields Generated by Ultra-relativistic Charged Bunches in a Perfectly Conducting Cylindrical Beam Pipe

The spectrum of electromagnetic fields satisfying perfectly conducting boundary conditions in a segment of a straight beam pipe with a circular cross-section is discussed as a function of various source models. These include charged bunches that move along the axis of the pipe with constant speed for which an exact solution to the initial-boundary value problem for Maxwell's equations in the beam pipe is derived. In the ultra-relativistic limit all longitudinal components of the fields tend to zero and the spectral content of the transverse fields and average total electromagnetic energy cross…

Comment on "How to Realize Uniform Three-Dimensional Ellipsoidal Electron Bunches"

Via systematic numerical simulation we found that the recently propose 'Pancake' scheme [O. J. Luiten et al., Phys. Rev. Lett. 93, 094802 (2004)] does not generate a beam desired for low emittance, even when compared with the more traditionally accepted cylindrical beam geometry.

射频系统芯片技术在超KEKB存储环注入点束流监测器中的应用

Application of RFSoC Technology for Beam Position Monitors at the SuperKEKB Storage Rings Injection Points

本文介绍了基于RFSoC平台开发的新读出设备，用于超KEKB存储环注入点的束流监测器，以实现高束流和亮度目标。

对正常和异常状态下圆柱形损耗管道纵向束流耦合阻抗的严格研究

A rigorous study on the longitudinal beam coupling impedance of a cylindrical lossy pipe in normal and anomalous regimes

本文提出了一种统一理论框架，用于分析圆柱形损耗管道中由带电粒子激发的电磁相互作用，推导了严格电导率表达式，并提供了异常状态下载流子反射系数的精确阻抗表达式。

Wakefields and Instabilities in Linear Accelerators

When a charged particle travels across the vacuum chamber of an accelerator, it induces electromagnetic fields, which are left mainly behind the generating particle. These electromagnetic fields act back on the beam and influence its motion. Such an interaction of the beam with its surro undings results in beam energy losses, alters the shape of the bunches, and shifts the betatron and synchrotron frequencies. At high beam current the fields can even lead to instabilities, thus limiting the performance of the accelerator in terms of beam quality and current intensity. We discuss in this lectur…

Cherenkov radiation and emission of surface polaritons from charges moving paraxially outside a dielectric cylindrical waveguide

We investigate the radiation from a charged particle moving outside a dielectric cylinder parallel to its axis. It is assumed that the cylinder is immersed into a homogeneous medium. The expressions are given for the vector potential and for the electric and magnetic fields. The spectral distributions are studied for three types of the radiations: (i) Cherenkov radiation (CR) in the exterior medium, (ii) radiation on the guided modes of the dielectric cylinder, and (iii) emission of surface polaritons. Unlike the first two types of radiations, there is no velocity threshold for the generation …