一、问题的提出:北京正负电子对撞机谱仪磁铁、是探测器的机械主体。对探测器提供磁场,在未来物理实验中,分析粒子的特性参数时,磁场参数是一项基本数据。因此,谱仪磁铁的磁场精度,直接影响物理实验的结果。同时由于正负电子对撞点在谱仪磁铁内部,磁场的分布也直接影响对撞点位置调整。所以磁铁参数在对撞机工程实施过程中也是很重要的参数。为了取得磁场重要的参数,必须对谱仪磁 First, the question put forward: Beijing Electron Positron Collider spectrometer magnet, the detector is the main body of the machine. Magnetic fields are provided to the detector. In future physics experiments, the magnetic field parameters are a basic data when analyzing the characteristic parameters of the particles. Therefore, the accuracy of the magnetic field of the spectrometer magnet directly affects the result of the physical experiment. At the same time as the positive and negative electron collision point in the spectrometer magnet, the distribution of the magnetic field also directly affect the collision position adjustment. Therefore, the parameters of the magnet in the collider engineering implementation process is also a very important parameter. In order to obtain the important parameters of the magnetic field, it must be magnetic spectrometer