Study of second generation, high-temperature superconducting coils: Determination of critical current
Study of second generation, high-temperature superconducting coils: Determination of critical current
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DOI：
10.1063/1.3698317
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发表时间：
2012-04-15
影响因子：
3.2
通讯作者：
Coombs, T. A.
中科院分区：
文献类型：
--
作者：
Zhang, Min;Kim, Jae-Ho;Coombs, T. A.
本文采用有限元法对第二代高温超导（HTS）煎饼线圈进行了建模。轴对称模型可用于计算线圈内部的电流和磁场分布。通过直接插值法将2G带的各向异性特性包含在模型中。通过与实验结果的对比，验证了模型的正确性。我们利用该模型对2G线圈的临界电流进行了研究，发现100 μ V/m作为判定线圈长期工作电流的标准过高，因为线圈的最内圈由于局部磁场的影响，达到临界电流的时间远远早于外圈。我们的模型表明，线圈上的平均电压标准为20 μ V/m，对应于最内层匝的电场超过100 μ V/m的点。因此，建议将20 μ V/m作为高温超导线圈的临界电流判据。本文还研究了背景场对线圈临界电流的影响。(C) 2012年美国物理研究所。[http://dx.doi.org/10.1063/1.3698317]
This paper presents the modeling of second generation (2 G) high-temperature superconducting (HTS) pancake coils using finite element method. The axial symmetric model can be used to calculate current and magnetic field distribution inside the coil. The anisotropic characteristics of 2G tapes are included in the model by direct interpolation. The model is validated by comparing to experimental results. We use the model to study critical currents of 2G coils and find that 100 mu V/m is too high a criterion to determine long-term operating current of the coils, because the innermost turns of a coil will, due to the effect of local magnetic field, reach their critical current much earlier than outer turns. Our modeling shows that an average voltage criterion of 20 mu V/m over the coil corresponds to the point at which the innermost turns' electric field exceeds 100 mu V/m. So 20 mu V/m is suggested to be the critical current criterion of the HTS coil. The influence of background field on the coil critical current is also studied in the paper. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698317]