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文章分析了由等离子体电流和真空室感应电流在HT－7U装置环向场超导磁体中产生的涡流损耗。超导磁体中变化的磁场被分解为切向和法向两个分量，通过将超导线圈分为适当单元可求出磁场两个分量产生的涡流损耗。文中给出涡流损耗的分布及其随时间变化情况。计算结果表明涡流损耗不仅沿线圈周长分布不均匀而且在线圈的断面上也不均匀。
The article analyzes the eddy current loss generated by the plasma current and vacuum chamber induced current in the hoop field superconducting magnet of HT-7U device. The changing magnetic field in the superconducting magnet is decomposed into tangential and normal components. By dividing the superconducting coil into appropriate units, the eddy current loss generated by the two components of the magnetic field can be obtained. The distribution of eddy current loss and its variation with time are given in this paper. The calculation results show that the eddy current loss is not only unevenly distributed along the circumference of the coil but also unevenly in the cross section of the coil.