Measurement of the CMS Magnetic Field
Measurement of the CMS Magnetic Field
复制标题
CMS 磁场的测量
DOI：
10.1109/tasc.2008.921242
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发表时间：
2008
影响因子：
1.8
通讯作者：
J. Zimmerman
中科院分区：
文献类型：
--
作者：
V. Klyukhin;A. Ball;F. Bergsma;D. Campi;B. Curé;A. Gaddi;H. Gerwig;A. Hervé;J. Korienek;F. Linde;C. Lindenmeyer;R. Loveless;M. Mulders;T. Nebel;R. P. Smith;D. Stickland;G. Teafoe;L. Veillet;J. Zimmerman
欧洲核子研究中心正在建设的紧凑型介子螺线管（CMS）探测器超导线圈跟踪体积内的磁场测量是用费米实验室设计和生产的场测绘仪完成的。现场测绘仪使用了10个由NIKHEF开发的3-D b传感器（霍尔探头），并在欧洲核子研究中心校准，在标称的4 T场中精度达到0.05%。在半径为1.724 m、长为7 m的圆柱体中，在中心磁场为2、3、3.5、3.8和4 t的位置上，对33840个点进行了精确的场图测量。在检查点上，用95个3- d b传感器测量了CMS线圈最大激励处的磁通密度和线圈放电后钢-空气界面上的剩余场。在CMS线圈的整个快速放电过程中（时间常数为190秒），对安装在轭上选定部分的22个405转磁回路产生的电压进行在线采样，并进行离线集成，以提供在最大磁场下钢的初始磁通密度测量，精度达到几个百分点。报道了在4t下的测量结果，并与用TOSCA计算的CMS磁体系统三维模型进行了比较。
The measurement of the magnetic field in the tracking volume inside the superconducting coil of the Compact Muon Solenoid (CMS) detector under construction at CERN is done with a fieldmapper designed and produced at Fermilab. The fieldmapper uses 10 3-D B-sensors (Hall probes) developed at NIKHEF and calibrated at CERN to precision 0.05% for a nominal 4 T field. The precise fieldmapper measurements are done in 33840 points inside a cylinder of 1.724 m radius and 7 m long at central fields of 2, 3, 3.5, 3.8, and 4 T. Three components of the magnetic flux density at the CMS coil maximum excitation and the remanent fields on the steel-air interface after discharge of the coil are measured in check-points with 95 3-D B-sensors located near the magnetic flux return yoke elements. Voltages induced in 22 flux-loops made of 405-turn installed on selected segments of the yoke are sampled online during the entire fast discharge (190 s time-constant) of the CMS coil and integrated offline to provide a measurement of the initial magnetic flux density in steel at the maximum field to an accuracy of a few percent. The results of the measurements made at 4 T are reported and compared with a three-dimensional model of the CMS magnet system calculated with TOSCA.