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扇形磁极含碳量的偏差、磁轭或盖板局部由于铸造工艺过程带来的内部缺陷(等效为磁导率的扰动)、磁极间隙的轮廓度偏差等磁铁的加工公差等因素,均可能在较大的半径范围内引起一次谐波,进而极大的影响束流品质。因此,中国原子能科学研究院正在建造的100MeV紧凑型强流回旋加速器采取了在磁轭上缠绕谐波线圈的方法以对大半径范围内的谐波场进行调节和补偿。该线圈共有4对,每个磁轭上下安装1对,每对线圈均关于中心平面对
The variation of the carbon content of the fan-shaped magnetic poles, the machining tolerances of the magnets such as the internal defects caused by the casting process of the yoke or the cover plate (equivalent to the perturbation of the magnetic permeability), the deviation of the magnetic pole gap profile, etc., In the larger radius of the first harmonic, which greatly affects the beam quality. Therefore, the 100MeV compact strong-current cyclotron under construction by China Institute of Atomic Energy takes the method of winding the harmonic coil on the yoke to adjust and compensate the harmonic field in a large radius. The coil a total of 4 pairs, each yoke mounted one pair up and down, each pair of coils on the center plane