A Conduction-Cooled REBCO Magnet With a Single-Stage GM Cryocooler and a Stainless Steel Case for Storing the Coil and Covering it From Thermal Radiation
A Conduction-Cooled REBCO Magnet With a Single-Stage GM Cryocooler and a Stainless Steel Case for Storing the Coil and Covering it From Thermal Radiation
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传导冷却 REBCO 磁体，配有单级 GM 低温冷却器和用于存放线圈并覆盖其免受热辐射的不锈钢外壳
DOI：
10.1109/tasc.2017.2674959
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发表时间：
2017
影响因子：
1.8
通讯作者：
Y. Ishii
中科院分区：
文献类型：
--
作者：
S. Iwai;H. Miyazaki;Y. Otani;T. Tosaka;K. Tasaki;S. Nomura;Y. Ishii
一个传导冷却的REBCO赛道线圈，是储存和浸渍在一个不锈钢的情况下，提出了机械加固直的部分。采用传统的传导冷却系统和新型的先进传导冷却系统，分别制作了两个由四个单薄煎饼组成的赛道线圈，并缠绕了两种REBCO胶带。由于后者，目前正在开发一种更简化的REBCO线圈冷却结构，而不需要传统的热辐射屏蔽。其中一个挑战是，当制冷机由于意外的电气和/或机械故障而停止工作时，限制热量流向线圈。在本研究中，不锈钢外壳与单级GM制冷机热连接。大部分热负荷由外壳接收，并在外壳和线圈表面之间插入热阻层，以控制流入线圈的热量。通过实验和计算，对REBCO盘管进行了间接冷却并成功运行，无任何退化现象，并对制冷机停止时的温升进行了评估。
A conduction-cooled REBCO racetrack coil that is stored and impregnated in a stainless steel case is proposed for mechanical reinforcement of the straight parts. Two racetrack coils composed of a stack of four single pancakes wound with two kinds of the REBCO tapes were fabricated and tested using conventional and new advanced conduction cooling systems, respectively. As the latter a more simplified cooling structure for a REBCO coil without the need for a conventional thermal radiation shield is currently under development. One challenge is restricting the flow of heat to the coil when the cryocooler stops due to an unexpected electrical and/or mechanical breakdown. In this research, the stainless steel case was thermally connected to a single-stage GM cryocooler. Most of the heat load was received by the case, and thermal resistance layers were inserted between the case and the coil surface for controlling the flow of heat into the coil. The REBCO coil was cooled indirectly and operated successfully without any degradation and the temperature rise when the cryocooler stopped was evaluated by experiments and calculations.