一种新型高梯度四极磁铁的设计及验证  

Design and verification of a novel high gradient quadrupole magnet

作　　者：朱亚[1,2,3] 张庆磊 周巧根[1,3] ZHU Ya;ZHANG Qinglei;ZHOU Qiaogen(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院上海高等研究院,上海201204

出　　处：《核技术》2022年第7期21-26,共6页Nuclear Techniques

基　　金：中国科学院青年创新促进会(No.2020287)资助。

摘　　要：随着第四代光源衍射极限环的发展,束流发射度越来越小,四极磁铁的磁场梯度要求越来越高。高梯度四极磁铁的研制已成为衍射极限环发展的关键元件之一。四极磁铁的磁场梯度取决于磁铁孔径、安匝数和磁效率。对于高饱和的高梯度四极磁铁,提高磁效率成为一种提高磁场梯度的可靠方案。本文设计了一种新型磁路来提高磁效率,从而提升四极磁铁的磁场梯度。应用该新型磁路设计了一台梯度大于100 T·m^(−1)的高梯度四极磁铁,并通过Poisson程序和Opera软件进行二维和三维模拟计算,验证其可行性和有效性。[Background]High gradient quadrupole magnet has become a key element with the development of diffraction-limited storage ring for the fourth generation light source.The gradient of magnetic field of a quadrupole magnet depends on the inscribed radius,ampere-turns per pole and magnetic efficiency.However,the radius and ampere-turns per pole cannot be reduced or increased indefinitely.Improving magnetic efficiency has become an effective method to improve the gradient of magnetic field.[Purpose]This study aims to design a novel magnetic circuit to improve magnetic efficiency and verify the effectiveness by simulation.[Methods]Permanent magnets were installed on both sides of the poles face to improve the efficiency of saturated magnets,so as to improve the magnetic field gradient of the quadrupole magnet.A novel high gradient quadrupole magnet,targeted 100 T·m−1,was designed to verify the theory by simulation calculation using Poisson for 2D analysis and OPERA for 3D analysis.The effect to the magnetic field quality of the novel magnetic circuit was optimized to achieve good field region.[Results]Simulation results show the magnetic field gradient of designed novel high gradient quadrupole magnet reaches to 100 T·m^(−1) when the ampere-turns per pole is about 5400AT.The magnetic efficiency is about 91%.All of the multipole components of magnetic field meet the requirements.[Conclusions]The design of the new quadrupole magnet provides a feasible and effective solution for the design of high gradient quadrupole magnet in the future.

关 键 词：四极磁铁 高磁场梯度 永磁铁 磁场质量 

分 类 号：TL503.8[核科学技术—核技术及应用]