Experiment and Simulation for Normal Zone Propagation of Multifilament MgB2 Superconducting Wire Cooled by Liquid Hydrogen
Experiment and Simulation for Normal Zone Propagation of Multifilament MgB2 Superconducting Wire Cooled by Liquid Hydrogen
复制标题
液氢冷却多丝MgB2超导线材正向区传播实验与仿真
DOI：
10.1109/tasc.2019.2896450
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发表时间：
2019
影响因子：
1.8
通讯作者：
Suzuki Takaaki
中科院分区：
文献类型：
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作者：
Matsumoto Taito;Shirai Yasuyuki;Shiotsu Masahiro;Kobayashi Hiroaki;Naruo Yoshihiro;Nonaka Satoshi;Inatani Yoshihiro;Tanaka Hideki;Kodama Motomune;Suzuki Takaaki
液氢（LH 2）冷却超导器件的应用开发是一个具有挑战性的问题。由于LH 2的沸点为20.4 K，因此临界温度为39 K的MgB 2可以在足够的温度裕度下冷却。此外，由于生产和材料成本低，MgB 2线有望用于超导设备。因此，为了设计MgB 2超导设备，了解正常区传播现象对于热稳定性和失超保护是非常重要的。在这项研究中，正常区的传播和最小淬火能量（MQE）与日立公司生产的多芯MgB 2超导线材浸没在LH 2。在实验中，热脉冲，启动一个正常区，注入到200厘米长的MgB 2线的中心区域。然后，在特定条件下测量MQE和正常区传播速度（NZPV）。在30 K时，LH 2冷却下的NZPV为几cm/s量级，MQE为几J量级。为了弄清MgB 2丝正常区传播过程中沿着方向的温度分布，建立了MgB 2丝在液氢冷却下的仿真模型，并利用有限元仿真软件对模型进行了分析。
Developing applications of liquid-hydrogen (LH2)-cooled superconducting devices is a challenging issue. Since the boiling point of LH2is 20.4 K, MgB2, whose critical temperature is 39 K, can be cooled with a sufficient temperature margin. Furthermore, MgB2wire is expected to be used for superconducting equipment due to the low production and material cost. Therefore, in order to design MgB2superconducting equipment, the knowledge of normal zone propagation phenomena is important for the thermal stability and the quench protection. In this study, normal zone propagation and minimum quench energy (MQE) with a multi-filamentary MgB2superconducting wire produced by Hitachi, Ltd. were observed under immersed in LH2. In the experiment, heat pulse, which initiates a normal zone, was injected to the center area of 200 cm long MgB2wire. Then, the MQE and the normal zone propagation velocity (NZPV) were measured under specific conditions. NZPV was in the order of several cm/s and MQE was in the order of a few J at 30 K under LH2cooling. In order to clarify temperature distribution along the wire during the normal zone propagating phenomena, the simulation model of MgB2wire cooled by LH2was created and analyzed using a finite element method simulation software.