武汉光源脉冲的非线性冲击磁铁设计研究

Design of pulsed nonlinear kicker magnet for Wuhan light source

近年来,基于非线性冲击磁铁的离轴注入方案逐渐成为一种新兴的研究方向,尤其适用于动力学孔径较小的储存环。该方案的特点是磁场在注入束流位置有较大值在中心轨道处接近零,显著降低了脉冲磁场对储存束流的扰动。设计了一种基于八导线布局的非线性冲击磁铁,重点研究了一些关键参数对磁场性能的影响,包括导线布局、磁铁端部边缘场、陶瓷真空镀膜等,并相应地综合优化了这些关键参数。结果表明所设计的非线性冲击磁铁能够满足在研的高亮度正负电子对撞环和高亮度同步辐射环的注入系统要求。

In recent years,off-axis injection schemes based on nonlinear kicker magnets have emerged as a new research focus,particularly suitable for storage rings with small dynamic apertures.This scheme is characterized by a strong magnetic field generated by the nonlinear kicker magnet at the injection point to deflect the injected beam,while maintaining a near-zero magnetic field near the central orbit,significantly reducing interference with the stored beam.This paper presents the design of a nonlinear kicker magnet with an eight-conductor layout,conducting an indepth study on the impact of key parameters—such as conductor layout,edge fields at the magnet ends,and ceramic vacuum coatings—on magnetic field performance,followed by optimization of these parameters.Results indicate that this nonlinear kicker magnet design meets the injection system requirements for the high-brightness electron-positron collider and synchrotron radiation ring under development.