高温超导磁体临界电流计算方法研究

Study on calculation method of critical current of HTS magnet

根据超导带材的临界特性确定超导磁体的临界电流是磁体设计中非常关键的一部分,目前计算超导磁体临界电流的常用方法主要是基于H方程的有限元方法。自洽模型是其中之一,该模型在计算单线圈的临界电流时表现出良好的精度。但是随着磁体规模的增大,传统的自洽模型由于计算效率低下不再适用。介绍了一种用于大型磁体临界电流计算的改进自洽模型。该模型在建模中使用了均质化的思想,大大减少了计算量,从而提高了计算速度。实验表明,改进后的模型具有较高的精度,满足实际需要。该模型将在大型磁体临界电流计算中得到较好的应用。

The important part of the superconducting magnet design is to determine the operating current based on the critical characteristics of the superconducting magnet. The most common method to calculate the critical current of a magnet is the finite element method based on the H equation. The self-consistent model is one of them and shows high accuracy when calculating the critical current of a single-coil. With the increase in the size of superconducting magnets, the traditional self-consistent model will appears to be incalculable. This article described an improved self-consistent model for critical current calculation of large magnets. The improved model used the idea of homogenization in modeling, which greatly reduced the amount of computation and increased the speed of calculations. Experiments show that the improved model has high accuracy. This model will be well applied in the critical current calculation of large superconducting magnets.