V. I. Klyukhin, D. Campi, B. Curé, A. Desirelli, S. Farinon, H. Gerwig, D. Green, J. P. Grillet, A. Hervé, F. Kircher, B. Levesy, R. Loveless, R. P. Smith
备注：
4 pages, 6 figures, 1 equation, 14 references
发表信息：
IEEE Transaction on Applied Superconductivity, v. 10, no. 1, pp. 428-431, March 2000
The CMS magnetic system consists of a super-conducting solenoid coil, 12.5 m long and 6 m free bore diameter, and of an iron flux-return yoke, which includes the central barrel, two end-caps and the ferromagnetic parts of the hadronic forward calorimeter. The magnetic flux density in the center of the solenoid is 4 T. To carry out the magnetic analysis of the CMS magnetic system, several 3D models were developed to perform magnetic field and force calculations using the Vector Fields code TOSCA. The analysis includes a study of the general field behavior, the calculation of the forces on the coil generated by small axial, radial displacements and angular tilts, the calculation of the forces on the ferromagnetic parts, the calculation of the fringe field outside the magnetic system, and a study of the field level in the chimneys for the current leads and the cryogenic lines. A procedure to reconstruct the field inside a cylindrical volume starting from the values of the magnetic flux density on the cylinder surface is considered. Special TOSCA-GEANT interface tools have being developed to input the calculated magnetic field into the detector simulation package.
The CMS Magnetic Field Measuring and Monitoring Systems
本文介绍了紧凑型μ子螺线管（CMS）探测器的磁场测量和监测系统的性能。为了交叉检查用CMS磁体模型获得的磁通量分布，使用了四个用于测量检测器体积中的磁通量密度的系统。测量了6米直径超导螺线管内的磁感应强度，目前由四个核磁共振（NMR）探头监测，探头安装在桶形强子量能器外，使用特殊的管子。另外两个NRM探头安装在跟踪系统的表面。2006年，使用10个基于霍尔效应的三维（3D）B传感器，在直径为3.448 m，长度为7 m的圆柱体中精确测量了超导螺线管内部的磁场。这些B传感器安装在自动化现场测绘机的两个螺旋桨臂上。除了这些测量系统之外，还开发了一种用于在CMS检测器操作期间监测磁场的系统。在水平平面中的螺线管内部，4个3D B传感器安装在跟踪检测器的面上。12个三维B传感器安装在磁通返回轭鼻盘的表面上。在CMS磁轭的气隙中安装了70个3D B传感器。专门开发的磁通回路技术用于CMS磁轭钢块内部最复杂的磁通量密度测量。磁通回路安装在磁通返回轭块的22个部分中。这些线圈包围的面积在桶形轮块中为0.3至1.59 m $^{2}$，在轭端盖盘块中为0.5至1.12 m $^{2}$。这些系统的发展和跨CMS磁体的磁通量密度测量的结果在这篇评论文章中介绍和讨论。
