电子储存环中闭合轨道和色散函数的校正

Correction of Closed Orbit and Dispersion Function in the Electron Storage Ring

电子储存环中,由磁铁元件制造误差和安装误差导致的闭合轨道和色散函数的畸变,通常会引起一系列的负面效应,介绍了以合肥光源储存环为模型,用响应矩阵的奇值分解法对闭合轨道和色散函数进行校正的可行性研究结果。

In electron storage ring, the distortion of closed orbit and dispersion, due to inaccuracies of magnets manufacture and misalignment, will cause a series of negative effects, such as tune-shift, distortion of optic function, decrease of dynamic aperture, and decrease of luminance et al. Previous work mainly concentrated on the correction of closed orbit, recently a method to correct orbit and dispersion simultaneously is developed to improve the performance of storage ring, and adopted by some accelerator labs. At the same time, the beam-based-alignment is adopted to let beam pass through the center of magnets instead of vacuum chamber, so the base for correction is also the center of magnets. This paper introduces the feasibility study of realizing correction of closed orbit and dispersion, by using singular value decomposition of response matrix, at Hefei Light Source storage ring. The simulation study shows that, the rms. value of closed orbit distortion is less than 0.1 mm, and dispersions at vertical plane and dispersion-free region at horizontal plane basically disappear after correction.