Transient stability of large aluminum stabilized superconductors
Transient stability of large aluminum stabilized superconductors
复制标题
大型铝稳定超导体的暂态稳定性
DOI：
10.1109/77.783373
复制
发表时间：
1999
影响因子：
1.8
通讯作者：
N. Yanagi
中科院分区：
文献类型：
--
作者：
S. Noguchi;A. Ishiyama;T. Satow;N. Yanagi
大电流复合超导体已被考虑并应用于中小企业线圈和熔合应用，如大螺旋装置（LHD）。这些超导体具有大截面积的高纯铝稳定剂，以提高其稳定性和提高整体电流密度。一旦在这种复合超导体中启动正常区，电流根据温度分布转移到铝稳定剂。然而，由于铝的电阻率低，导体尺寸大，电流在稳定区内扩散的时间常数很长。因此，在超导细丝附近的小区域内产生多余的焦耳热，局部温度升高。在本文中，为了评价这种特殊的性质，我们进行了一些超导体淬火过程的模拟应用于国家核聚变科学研究所的LHD螺旋线圈。利用新开发的计算机程序进行了仿真，并与LHD导体短样稳定性试验结果进行了比较。此外，我们还重点研究了采用CuNi合金包层的LHD导体对其法向过渡和法向区传播性能的影响。
Very large current composite superconductors have been considered and adopted to use in SMES coils and fusion applications, such as the Large Helical Device (LHD). These superconductors have large cross-sectional area of high purity aluminum stabilizer to improve their stability and to enhance the overall current density. Once a normal-zone is initiated in such a composite superconductor, the current transfers to the aluminum stabilizer according to the temperature distribution. The time constant of current diffusion in the stabilizes however is very long due to the low electrical resistivity of aluminum and the large conductor size. Therefore, an excess Joule heat is generated in a small area near superconducting filaments and the temperature increases locally. In this paper, to evaluate this peculiar property, we carry out some simulations with regard to quench process in the superconductor applied to the helical coil of LHD in the National Institute for Fusion Science. The simulations, by using a newly developed computer code, are compared with the experimental results of the stability tests on the short samples of LHD conductor. Furthermore, we focus on the influence of the CuNi alloy clad adopted to the LHD conductor on the normal transition and normal-zone propagation properties.