Study on Normal Zone Characteristics in a REBCO Insert Coil Induced by Quenches in an LTS Outsert Coil
Study on Normal Zone Characteristics in a REBCO Insert Coil Induced by Quenches in an LTS Outsert Coil
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LTS外置线圈淬火引起的REBCO插入线圈正态区特性研究
DOI：
10.1109/tasc.2016.2540918
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Y. Iijima
中科院分区：
文献类型：
--
作者：
Y. Tsuchiya;S. Muto;H. Oguro;S. Awaji;K. Watanabe;H. Miyazaki;S. Hanai;S. Ioka;M. Daibo;Y. Iijima
本文从实验和数值两个方面研究了REBCO单片线圈在低温超导外伸线圈中的猝灭引起的正常区，以讨论REBCO线圈的失超保护。在充电5T的外接线圈淬火过程中，通过测量30~50K温度范围内REBCO线圈中的偏压，实验上明确了正常区。在0-5T和10-77K范围内，对REBCO线圈各部件的物理性能进行了实际拟合，数值结果与实验结果吻合较好。模拟得到了初始温度在10~65K范围内的加热分布，表明初始温度越低，热点内的最高温度越高。出乎意料的是，当初始温度为65K时，温度分布变得相当均匀，这表明温度越高的热点烧毁的风险越小。最后讨论了在出现热点时，采用高温运行或失超加热法使REBCO线圈保持高温的可能的线圈保护措施。
In this paper, normal zone in a REBCO single-pancake coil induced by quenches in a low-temperature superconducting outsert coil is investigated in both experimental and numerical methods to discuss the quench protection of REBCO coils. The normal zone is experimentally clarified by measuring a partial voltage in the REBCO coil at temperatures from 30 K to 50 K during quenches of the outsert coil charging 5 T. Using practical fittings for the physical properties of the components of the REBCO coil in ranges of 0-5 T and 10-77 K, the numerical results have good agreement with the experimental results. The simulation reveals the heating distribution with initial temperatures from 10 K to 65 K, which indicates that the maximum temperature in a hot spot becomes higher for the lower initial temperature. Unexpectedly, the temperature distribution becomes rather homogeneous with an initial temperature of 65 K. It suggests that the hot spot at higher temperature has a lower risk of burning out. Finally, possible coil protections are discussed as the operation at the high temperature or the quench heater method to keep the REBCO coil at high temperature when a hot spot appears.