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串列加速器升级工程在线同位素分离器(ISOL)要求质量分辨率20000,分析磁铁场均匀性要求好于0.001%。采用所谓的垫补线圈可以有效地在磁场径向产生各阶梯度场,对二极铁引起的高阶像差进行修正。使用垫补线圈的优点在于可以方便地改变磁场梯度,而不受磁铁主场强的影响,同时可以节省系统的空间。改变一阶、二阶以及三阶梯度场的垫补线圈分别叫α、β和γ修正线圈。通过实验,α、β修正线圈已取得了很好的结果,α值和β值分别与理论计算值相差约2%和6%,本文对γ修正线圈进行实验研究。
Tandem accelerator upgrade project Online Isolute Splitter (ISOL) requires a mass resolution of 20,000, and analysis of magnet field uniformity requirements of better than 0.001%. The use of so-called padded coils can effectively generate gradient fields in the radial direction of the magnetic field and correct the higher-order aberrations caused by the diode. The advantage of using padded coils is that the magnetic field gradient can easily be changed without being affected by the magnet strength of the magnet, while saving system space. Change the first order, second order and third order gradient field padding coil called α, β and γ correction coil. Experiments show that the α, β correction coils have achieved good results, and the α and β values differ by about 2% and 6% from the theoretical values respectively. In this paper, experimental research on the γ correction coils is carried out.