Design and Test Results of a Cryogenic Cooling System for a 25-T Cryogen-Free Superconducting Magnet
Design and Test Results of a Cryogenic Cooling System for a 25-T Cryogen-Free Superconducting Magnet
复制标题
DOI：
10.1109/tasc.2017.2673762
复制
发表时间：
2017-02
影响因子：
1.8
通讯作者：
M. Takahashi;S. Iwai;H. Miyazaki;T. Tosaka;K. Tasaki;S. Hanai;S. Ioka;H. Takigami;Kazuo Watanabe;S. Awaji;H. Oguro;Y. Tsuchiya
中科院分区：
文献类型：
--
作者：
M. Takahashi;S. Iwai;H. Miyazaki;T. Tosaka;K. Tasaki;S. Hanai;S. Ioka;H. Takigami;Kazuo Watanabe;S. Awaji;H. Oguro;Y. Tsuchiya
研发了一种用于25特斯拉无液氦超导磁体（25T - CSM）的低温冷却系统。25T - CSM由11特斯拉高温超导（HTS）线圈和14特斯拉低温超导（LTS）线圈组成。交流损耗约为10瓦的高温超导线圈通过两台GM制冷机和一个氦气循环装置冷却至约10开尔文。在该系统中，气体流速有一个优化值，并由质量流量控制器进行控制。低温超导线圈通过两台GM / JT制冷机冷却至约4开尔文。每台GM / JT制冷机有两组预冷气体管路。这些预冷管路由两台单级GM制冷机以及高温超导线圈冷却系统通过一个热交换器进行冷却，该热交换器位于高温超导气体循环管路与低温超导冷却管路之间。经过25T - CSM的冷却测试，低温超导线圈和高温超导线圈分别在164小时（约7天）内从室温冷却至4.3开尔文和4.6开尔文。在高温超导线圈的励磁测试过程中，其最高温度升至7.6开尔文，这一温度仍然足够低。
A cryogenic cooling system for a 25-T cryogen-free superconducting magnet (25T-CSM) was developed. The 25T-CSM consisted of 11-T high-Tc superconducting (HTS) coils and 14 T low-Tc superconducting (LTS) coils. The HTS coils, which had about 10-W AC-loss, were cooled to about 10 K by two GM cryocoolers and a helium gas circulation unit. In this system, the gas flow rate had an optimized value and was controlled by a mass flow controller. The LTS coils were cooled to about 4 K by two GM/JT cryocoolers. Each GM/JT cryocooler had two sets of precooling gas lines. These pre-cooling lines were cooled by two single-stage GM cryocoolers and the HTS coil cooling system via a heat exchanger, between the HTS gas circulation line and the LTS cool-down line. As a result of cooling test of the 25T-CSM, the LTS coils and HTS coils were cooled from room temperature to 4.3 K and 4.6 K within 164 h (about seven days), respectively. During the excitation test of the HTS coils, their maximum temperature increased to 7.6 K, which was still sufficiently low.