高能加速器主环磁铁是一种不同于一般常用直流磁铁的磁性材料。它处于慢脉冲励磁下工作,在每一个脉冲周期内粒子束流从注入,加速到引出使磁铁处在一个由弱磁场到强磁场周期变化的磁场下。因此,加速器要求主磁铁材料不但有高的饱和磁感值,低矫顽力而且要求在弱磁场下也有高的导磁率。是我国尚未生产过的一种特殊用途 High-energy accelerator main ring magnet is a magnetic material different from the commonly used DC magnet. It operates under a slow pulsed excitation and the particle beam is injected, accelerated, and led out during each pulse period to place the magnet under a magnetic field that changes periodically from a weak magnetic field to a strong magnetic field. Therefore, the accelerator requires that the main magnet material not only has a high saturation magnetization value, a low coercive force but also a high magnetic permeability in a weak magnetic field. It is a special use not yet produced in our country