二极铁均匀场修正
Modification of Dipole Homogeneity Field
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摘要: HI-13串列加速器升级工程中的ISOL高质量分辨谱仪要求20000的质量分辨率， 分析磁铁磁场均匀性要求好于1×10-5。 要达到这样高的磁场均匀性， 必须对磁铁进行垫补。 介绍了二极铁表面线圈垫补均匀场的设计方法和制作工艺， 并且基于现有的一块C型二极铁对表面线圈垫补均匀场的方法进行了实验研究。 实验结果表明， 采用表面线圈垫补后， 场均匀性提高了一个数量级， 积分场的均匀性从5×10-4提高到3×10-5。 The mass resolving power of ISOL’s spectrometer for Beijing Radioactive Ionbeam Facilities project is 20000， which requires the field uniformity of the magnet better than 1×10-5. To achieve such a high uniformity field，field optimize is indispensable. This paper presents the design method，manufacture techniques and experiment results of surface coils，which are set on pole face of a dipole to improve the magnetic field homogeneity. The integral field uniformity with surface coil is optimized to 3×10-5 from 5×10-4，which is improved roughly an order of magnitude.Abstract: The mass resolving power of ISOL’s spectrometer for Beijing Radioactive Ionbeam Facilities project is 20000， which requires the field uniformity of the magnet better than 1×10-5. To achieve such a high uniformity field，field optimize is indispensable. This paper presents the design method，manufacture techniques and experiment results of surface coils，which are set on pole face of a dipole to improve the magnetic field homogeneity. The integral field uniformity with surface coil is optimized to 3×10-5 from 5×10-4，which is improved roughly an order of magnitude.
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