Novel HTS coil protection method using secondary windings as a quench heater
Novel HTS coil protection method using secondary windings as a quench heater
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使用次级绕组作为失超加热器的新型高温超导线圈保护方法
DOI：
10.1088/1742-6596/1559/1/012118
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Hirano N
中科院分区：
文献类型：
--
作者：
Onodera Y;Mito T;Takahata K;Hirano N
在NIFS，高温超导磁体的研究和开发已经开始，目标是应用于大型螺旋装置的下一个实验装置，即氦氖型聚变等离子体实验装置。下一个实验装置需要大的线圈电流密度，如80a / mm2，因此开发线圈保护方法是很重要的。在这项研究中，我们提出了一种利用二次绕组的新型高温超导磁体线圈保护技术。通过在导体的一部分中嵌入电隔离的二次绕组，并使用二次绕组作为淬火加热器，可以迅速扩散正常传导的发生，从而防止高温超导线圈中的局部温度升高。我们将这种方法应用于正在开发的导体和线圈，并分析了次级绕组的热行为。结果发现，整个线圈的温升可以被抑制，热点区域可以扩散。这表明了通过使用二次绕组线圈保护的适用性，因此，根据外部电阻的值，通过改变内部消耗和外部恢复之间的磁存储能量的比率，可以实现最佳线圈保护。
In NIFS, research and development of HTS magnets have been begun aiming at the application to a next experimental device of Large Helical Device which is a heliotron-type fusion plasma experimental device. The next experimental device needs large coil current density such as 80 A/mm 2, therefore it is important to develop a coil protection method. In this study, we have proposed a novel coil protection technology of HTS magnets using secondary windings. By embedding secondary windings which are electrically isolated in a part of the conductor and using the secondary windings as a quench heater, the occurrence of normal conduction is quickly diffused, then prevented local temperature rise in the HTS coil. We applied this method to the conductor and coil under development, and analysed the thermal behaviour of the secondary windings. As a result, we found that the temperature rise of the entire coil can be suppressed and the hotspot region can be diffused. This shows the applicability of coil protection by using the secondary windings, therefore optimal coil protection is possible by changing the ratio of magnetic stored energy between internal consumption and external recovery depending on the value of external resistance.