Design and end chamfer simulation of PEFP beam line curved dipole magnets

The design, fabrication and field measurement of 11 DC curved dipole magnets for the PEFP Beam Line have been completed. In this paper, a design method for a complex end chamfer using OPERA-3D is proposed. The conventional method for estimating chamfer shape is extended and applied to a curved dipole magnet by a coordinate transformation. Using the interface with CAD software, the complex end chamfer is modeled and fully determined by 3D simulation to meet the field uniformity requirement. The magnetic field measurement results are in good agreement with the simulation. The design considerations, field simulation results, end chamfer development process and measurement results are presented in detail.     

永磁扭摆磁铁的同步辐射特性和结构分析

简要分析了永磁扭摆磁铁所产生的同步辐射光的基本特性，并得出永磁扭摆磁铁所产生的同步辐射光的辐射功率角分布和总功率.介绍了永磁扭摆磁铁的基本结构，并对起主要承载力的C型框架和整体结构进行了有限元分析，从而得到磁铁结构在不同情况下的变形.应用理论公式对C型框架的变形位移量进行了验证，为永磁扭摆磁铁的结构设计和进一步改进提供了理论依据. 关键词： 扭摆磁铁 同步辐射 C型框架 有限元分析     

永磁多体直线阵列系统的二维场形分析

根据“均匀磁化”原理,利用谐波分析方法,对永磁多体直线阵列系统的二维场形进行了计算,得到了精确的解析表达式。运用这些关系式可以计算出二维场的主波及其各次寄生谐波。     

永磁波动磁铁的二维场形分析及其优化

分析了渐变磁化永磁波动磁铁(Undulator)的场形. 得到了二维解析表达式. 给出了减少高次谐波的条件. 具体计算并比较了渐变型、简易型及混合型三种不同类型波动磁铁的优缺点. 指出了它们各自最合理的适用范围.     

混合型插入件的三维场形分析和计算

本文根据“均匀磁化”原理,对永磁直线阵列周期系统──混合型插入件(Hybrid Insertion Devices)的三维场形进行了分析,得到了近似的三维解析表达式.运用这些关系式可以计算混合型结构的永磁插入件的三维场形.这个简单、有效的解析计算方法,有助于永磁插入件的优化、设计.     

BEPC Ⅱ工程磁铁设计与制造

北京正负电子对撞机(BEPC)改造工程是将原来的单环升级为高亮度的双环对撞机(BEPCⅡ),即在现存的BEPC隧道里增加一个新的储存环.使得BEPC Ⅱ能够提供从1.0GeV到2.1GeV能量范围的高亮度对撞束流供高能物理实验用,同时外环还要兼容2.5GeV能量250mA流强的同步辐射专用模式运行,实际上相当于有3个储存环运行.由于受到BEPC储存环隧道空间的局限,物理上的高亮度要求,以及BEPCⅡ真空盒设计采用带前室(Antechamber)结构,因此给各种磁铁设计与制造增加了相当大的难度.着重介绍BEPCⅡ储存环和对撞区中几种主要常规磁铁的设计、制造概况,同时也给出了相应的磁场测量结果.     

中国散裂中子源磁铁系统和样机研制

中国散裂中子源(china spallation Neutron source,CSNS)快循环同步加速器(Rapid cyclingSync,arotron,RCS)磁铁由24块二极磁铁、48块四极磁铁、16块六极磁铁和若干斜四极磁铁以及校正磁铁组成,其中二极磁铁和四极磁铁是带直流偏置的25Hz正弦交流励磁,铁芯和线圈导体将产生不可忽视的涡流效应.为了积累批量生产磁铁的制造经验,探索磁铁后期处理和磁场测量方法,已完成了中空水冷铝绞线试样线圈的研制,启动了二极磁铁和四极磁铁样机的研制.本文将对相关进展进行介绍.     

ATPF—a dedicated proton therapy facility

A proton therapy facility based on a linac injector and a slow-cycling synchrotron is proposed. To obtain good treatments for different cancer types, both the spot scanning method and the double-scattering method are adopted in the facility, whereas the nozzles include both gantry and fixed beam types. The proton accelerator chain includes a synchrotron of 250 MeV in maximum energy, an injector of 7 MeV consisting of an RFQ and a DTL linac, with a repetition rate of 0.5 Hz. The slow extraction using the third-order resonance and together with the RFKO method is considered to be a good method to obtain a stable and more-or-less homogenous beam spill. To benefit the spot scanning 200 between 60 MeV and 230 MeV. A new method method, the extraction energy can be as many as about - the emittance balancing technique of using a solenoid or a quadrupole rotator is proposed to solve the problem of unequal emittance in the two transverse planes with a beam slowly extracted from a synchrotron. The facility has been designed to keep the potential to be upgraded to include the carbon therapy in the future.     

中国散裂中子源磁铁系统和样机研制

中国散裂中子源(China Spallation Neutron Source, CSNS)快循环同步加速器(Rapid Cycling Synchrotron, RCS)磁铁由24块二极磁铁、48块四极磁铁、16块六极磁铁和若干斜四极磁铁以及校正磁铁组成, 其中二极磁铁和四极磁铁是带直流偏置的25Hz正弦交流励磁, 铁芯和线圈导体将产生不可忽视的涡流效应. 为了积累批量生产磁铁的制造经验, 探索磁铁后期处理和磁场测量方法, 已完成了中空水冷铝绞线试样线圈的研制, 启动了二极磁铁和四极磁铁样机的研制. 本文将对相关进展进行介绍.     

亥姆霍兹线圈测量系统的测量原理及程序设计

叙述了利用磁通法建立亥姆霍兹线圈测量系统的测量原理,并将其应用于永磁体磁性能参数(Br,Hc,易磁化轴方向等)的测量.在利用现有高性能积分器的基础上,还给出了测量程序的设计方法,并利用此测量系统对BEPC永久四极磁铁模型所用磁块进行了测量.最后,就由于亥姆霍兹线圈机械偏差所带来的测量误差进行了讨论.