Permanent magnet assembly for particle spectrometer
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摘要: 研制的永磁组件采用主辅永磁体和匀场技术相结合的改进C型磁路结构，利用计算机仿真技术对组件磁路结构进行验证及优化。仿真分析及实验结果表明：采用这种磁路结构扩大了均匀区的范围，提高了磁场均匀性。按这种结构制造的永磁组件在20 mm气隙、中心平面200 mm120 mm均匀区内气隙磁通密度达到0.75 T，不均匀度为0.67%。另外，也对永磁组件在高低温下的磁性能进行了仿真计算,结果表明:在-55~70 ℃温度范围内均匀区的气隙磁通密度变化为4%左右。Abstract: A permanent magnet assembly is presented according to the primary requirement for the magnetic field in the particle spectrometer. The permanent magnet assembly adopts the C-type magnetic circuit along with assistant magnets. Magnet circuits are validated and optimized by simulation technology. The results of both simulation and experiments show that the uniform working region is enlarged， and the magnetic field homogeneity is improved with the optimized magnetic circuit. The Magnetic field strength of the optimized permanent magnet assembly is up to 0.75 T in the uniform working region of 200 mm120 mm， and the magnetic field inhomogeneity is 0.67%.In addition， the magnetic properties of the permanent magnet assembly at different temperatures are simulated, the change rate of the magnetic field strength in the uniform region is about 4% from -55~70 ℃.
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