Measurement of the ATLAS solenoid magnetic field
Measurement of the ATLAS solenoid magnetic field
复制标题
ATLAS 螺线管磁场的测量
DOI：
10.1088/1748-0221/3/04/p04003
复制
发表时间：
2008
影响因子：
1.3
通讯作者：
L. Chevalier
中科院分区：
文献类型：
--
作者：
M. Aleksa;F. Bergsma;P. Giudici;A. Kehrli;M. Losasso;X. Pons;H. Sandaker;P. Miyagawa;S. Snow;J. Hart;L. Chevalier
ATLAS是一种通用探测器，旨在探索大型强子对撞机的广泛物理学。ATLAS的中心是一个在2 T螺线管磁场中的跟踪探测器。本文描述了为绘制野外地图而建造的机器、数据分析方法、最终结果及其估计的不确定性。远程控制的绘图机使用气动马达，并从光学编码器反馈，在几个小时内扫描一系列霍尔探头，并记录20000多个点的数据。数据进行了分析，充分利用物理约束的领域和我们的知识的螺线管线圈的几何形状。在对数据本身进行一系列小的修正后，得到的地图被拟合成符合麦克斯韦方程的函数。拟合残差具有r.m.s.小于0.5 mT，由于磁场不确定性，轨道矢高测量的系统误差估计在0.02%至0.12%的范围内，这取决于轨道的快速性。
ATLAS is a general purpose detector designed to explore a wide range of physics at the Large Hadron Collider. At the centre of ATLAS is a tracking detector in a 2 T solenoidal magnetic field. This paper describes the machine built to map the field, the data analysis methods, the final results, and their estimated uncertainties. The remotely controlled mapping machine used pneumatic motors with feedback from optical encoders to scan an array of Hall probes over the field volume and log data at more than 20 000 points in a few hours. The data were analysed, making full use of the physical constraints on the field and of our knowledge of the solenoid coil geometry. After a series of small corrections derived from the data itself, the resulting maps were fitted with a function obeying Maxwell's equations. The fit residuals had an r.m.s. less than 0.5 mT and the systematic error on the measurement of track sagitta due to the field uncertainty was estimated to be in the range 0.02% to 0.12% depending on the track rapidity.