Enhancement of Thermal Properties of HTS Magnets Using Built-in Cryogenic Oscillating Heat Pipes
Enhancement of Thermal Properties of HTS Magnets Using Built-in Cryogenic Oscillating Heat Pipes
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DOI：
10.1109/tasc.2013.2251393
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发表时间：
2013-03
影响因子：
1.8
通讯作者：
T. Mito;K. Natsume;N. Yanagi;H. Tamura;Y. Terazaki
中科院分区：
文献类型：
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作者：
T. Mito;K. Natsume;N. Yanagi;H. Tamura;Y. Terazaki
利用内置式低温振荡热管（OHP）对高T {\rmc}$超导磁体的热性能进行了增强研究。低温OHP内置于HTS磁体的绕组中，以改善绕组的热性能并保护它们免受大的温度梯度引起的损坏。对于HTS磁体来说，快速去除绕组中产生的热量是相当困难的，特别是在磁体失超时的保护操作中，因为绕组的组成材料的热扩散率随着温度的升高而降低。因此，可能在磁体中形成局部热点，并且存在超导性能劣化和/或由热应力引起的机械损伤的可能性。研制了一种平板式低温OHP，作为一种高性能的热传输装置，可嵌入磁体绕组中，同时提高磁体的导热率和热扩散率。以氢气、氖和氮气为工质，在18-84 K的工作温度范围内，证明了其优良的热输运性能。
Enhancement of the thermal properties of high-$T_{\rm c}$ superconducting (HTS) magnets has been investigated using built-in cryogenic oscillating heat pipes (OHPs). A cryogenic OHP is built into windings of an HTS magnet to improve the thermal properties of windings and to protect them from damage caused by a large temperature gradient. It is rather difficult for an HTS magnet to quickly remove the heat generated in windings, especially, in a protection operation when a magnet quenches, because the thermal diffusivities of component materials of windings decrease with an increase of temperature. Therefore, a local hot spot can be formed in a magnet, and there are possibilities of having degradation of superconducting properties and/or mechanical damages by thermal stresses. A flat-plate cryogenic OHP has been developed that is suitable for imbedding in magnet windings as a high-performance heat transportation device in order to increase the thermal conductivity and the thermal diffusivity at the same time. By using hydrogen, neon, and nitrogen as working fluid, its excellent thermal transport properties have been proved in the operating temperature range of 18–84 K.