magnetic flux jumps, superconducting magnets, thermomagnetic instabilities
Abstract :
[en] Superconductors play a crucial role in the advancement of high-field electromagnets. Unfortunately, their performance can be compromised by thermomagnetic instabilities, wherein the interplay of rapid magnetic and slow heat diffusion can result in catastrophic flux jumps, eventually leading to irreversible damage. This issue has long plagued high-Jc Nb3Sn wires at the core of high-field magnets. In this study, we introduce a large-scale GPU-optimized algorithm aimed at tackling the complex intertwined effects of electromagnetism, heating, and strain acting concomitantly during the quenching process of superconducting coils. We validate our model by conducting comparisons with magnetization measurements obtained from short multifilamentary Nb3Sn wires and further experimental tests conducted on solenoid coils while subject to ramping transport currents. Furthermore, leveraging our developed numerical algorithm, we unveil the dynamic propagation mechanisms underlying thermomagnetic instabilities (including flux jumps and quenches) within the coils. Remarkably, our findings reveal that the velocity field of flux jumps and quenches within the coil is correlated with the cumulated Joule heating over a time interval rather than solely being dependent on instantaneous Joule heating power or maximum temperature. These insights have the potential to optimize the design of next-generation superconducting magnets, thereby directly influencing a wide array of technologically relevant and multidisciplinary applications.
Research Center/Unit :
Q-MAT - Quantum Materials - ULiège
Disciplines :
Materials science & engineering
Author, co-author :
Xue, Cun ; School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, 710072, Xi'an, China. xuecun@nwpu.edu.cn
Ren, Han-Xi; School of Aeronautics, Northwestern Polytechnical University, 710072, Xi'an, China
Jia, Peng; School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, 710072, Xi'an, China
Wang, Qing-Yu; School of Aeronautics, Northwestern Polytechnical University, 710072, Xi'an, China
Liu, Wei; Western Superconducting Technologies Co., Ltd., and Xi'an Superconducting Magnet Technology Co. Ltd, 710014, Xi'an, China
Ou, Xian-Jin; Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China ; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 100049, Beijing, China
Sun, Liang-Ting ; Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China ; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 100049, Beijing, China
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
Holistic numerical simulation of a quenching process on a real-size multifilamentary superconducting coil.
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