Optimization of winding geometry of Bi(2223)Ag coils with respect to external magnetic field
Optimization of winding geometry of Bi(2223)Ag coils with respect to external magnetic field
复制标题
Bi(2223)Ag 线圈绕线几何形状相对于外部磁场的优化
DOI：
10.1109/77.920326
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发表时间：
2001
影响因子：
1.8
通讯作者：
H. Kirchmayr
中科院分区：
文献类型：
--
作者：
J. Pitel;P. Kováč;A. Kasztler;H. Kirchmayr
开发了一种理论模型，可以估计暴露于外部磁场的高温超导圆柱形线圈绕组中的临界电流分布。该模型考虑了 Bi(2223)Ag 带的 I/sub c/(B) 特性的实际角度依赖性（各向异性）。它显示了在相同总带长度内绕组几何形状的变化以及与磁体轴平行的施加的外部磁场的值如何影响临界电流和磁体本身产生的磁场。据预测，与不存在外部磁场的情况下实现的磁体临界电流相比，施加平行于 HTS 磁体轴的低磁场可能会导致磁体临界电流相对较高的增加（高达 30-40%）。介绍了通过使用 Vacuumschmelze GmbH 生产的不同长度的 Bi(2223)Ag 复丝带来优化磁体绕组几何形状的示例。
A theoretical model, which enables to estimate the critical currents distribution in the winding of HTS cylindrical coils exposed to external magnetic field, was developed. The model takes into account the real angular dependence (anisotropy) of the I/sub c/(B) characteristic of Bi(2223)Ag tape. It is shown how the change in the winding geometry within the same overall tape length and the value of applied external magnetic field parallel with the magnet axis influences both, the critical current and the resulting magnetic field generated by the magnet itself. It is predicted that applying a low magnetic field parallel to the HTS magnet axis may result in a relatively high increase in the magnet critical current (up to 30-40%) if compared with the magnet critical current achieved without the presence of external magnetic field. An example of optimizing the magnet winding geometry by using the different lengths of the Bi(2223)Ag multifilamentary tape of Vacuumschmelze GmbH production is presented.