The Underlying Mechanism of Faster Current Attenuation of HTS Magnet in Persistent Current Mode Subject to the Traveling
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ORIGINAL PAPER
The Underlying Mechanism of Faster Current Attenuation of HTS Magnet in Persistent Current Mode Subject to the Traveling Magnetic Fields Ruichen Wang 1 & Chao Wang 2 & Yuke Deng 1,3 & Tianyong Gong 1,3 & Jing Li 1 & Pengbo Zhou 1 & Kang Liu 1 & Zhengwei Zhao 1 & Hengbin Cui 2 & Xue Deng 2 & Guangtong Ma 1 Received: 12 August 2020 / Accepted: 3 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract High-temperature superconducting (HTS) magnet, due to its greater performance of magnetic field at higher temperature (20– 40 K), better thermal stability, smaller volume and weight under the same requirements, and lower refrigeration costs, has attracted growing attention in the ultra-high-speed maglev system, high field magnet, and some other applications. Considering the practical requirements, closed-loop method is generally adopted in HTS magnet to maintain the persistent operation and to output the stable magnetic fields. But the accelerated current attenuation occurs when the HTS magnet is subjected to traveling magnetic fields, which is not conducive to the long-term operation. Therefore, this paper aims to investigate the essence of current attenuation of HTS magnet in persistent current mode under traveling magnetic fields and to further suppress this adverse behavior. In this study, to calculate the current distribution and dynamic resistance, a two-dimensional (2D) finite element model (FEM) was established and verified by comparing with the experimental results. It can be seen from the simulation results that the dissipative losses caused by dynamic resistance present a non-negligible effect on the current attenuation of the magnet. And the mechanism of faster current attenuation was well explained by the variation of the dynamic resistance under the traveling magnetic fields. Keywords High-temperature superconducting (HTS) magnet . Persistent current mode . Traveling magnetic fields . Current attenuation . Dynamic resistance
1 Introduction With the development of high-temperature superconducting (HTS) materials, the HTS magnet shows comparable performance at a higher temperature (20–40 K) as low-temperature superconducting (LTS) magnet [1]. Simultaneously, the superiorities of the HTS magnet including better thermal stability, smaller volume and weight under the same requirements, and * Guangtong Ma [email protected] 1
Applied Superconductivity Laboratory, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2
Chengdu Yunda Innovation Technology Group Co., Ltd, Chengdu, China
3
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
lower refrigeration costs make it promising for some applications, such as the ultra-high-speed maglev system, the medical apparatus, and the high field magnet [2–6]. In order to promote the application of HTS magnet in industrial field safely, it is essential to investigate the performance of the magnet taking the application
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