Complete suppression of flux instabilities in ramped superconducting magnets with synchronous temperature-modulated Jc
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912369695784960 |
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| author | Xue, Cun Ren, Han-Xi Cao, Kai-Wei Liu, Wei Zhang, Wen-Tao Yang, Fang Yan, Guo Zhou, You-He Zhang, Pingxiang |
| author_facet | Xue, Cun Ren, Han-Xi Cao, Kai-Wei Liu, Wei Zhang, Wen-Tao Yang, Fang Yan, Guo Zhou, You-He Zhang, Pingxiang |
| contents | Nonlinear multi-field coupling as an intrinsic property of complex physical systems often leads to abrupt and undesired instabilities. For current-ramped high-field Nb3Sn magnets, frequent flux jumps are observed, which easily causes premature quenches and requires prolonged and resource-intensive magnet training process. In this study, we propose a paradigm-shifting methodology framework that achieves complete suppression of thermomagnetic instabilities through synchronized temperature-modulated critical current density (Jc). Through numerical simulations of flux jumps in multifilamentary Nb3Sn wires at various temperatures, we construct thermomagnetic stability diagram in the Ha-T plane. The simulated results are in good agreement with experiments, confirming that the synchronized temperature ramp-down can fully eliminate flux jumps. We reveal the underlying mechanism of enhancing the thermomagnetic stability arises from that synchronized temperature ramp-down can continuously tune both Jc and its slope. Furthermore, we explore the thermomagnetic instabilities of current-ramped superconducting magnets through large-scale GPU-optimized algorithm. The flux jump and quench diagram in the Ia-T plane are obtained. It indicates that the temperature ramp-down can completely suppress flux jumps without compromising Jc at high magnetic fields. Importantly, this method does not require modifications to the superconducting microstructures or fabrication process, offering a practical and broadly applicable solution. The findings not only provide a robust method for stabilizing various superconducting magnet systems, including high-temperature superconducting magnets wound with second-generated (2G) coated tapes, but also suggest a generalizable strategy for controlling instability in other nonlinear non-equilibrium physical systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04159 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Complete suppression of flux instabilities in ramped superconducting magnets with synchronous temperature-modulated Jc Xue, Cun Ren, Han-Xi Cao, Kai-Wei Liu, Wei Zhang, Wen-Tao Yang, Fang Yan, Guo Zhou, You-He Zhang, Pingxiang Superconductivity Applied Physics Nonlinear multi-field coupling as an intrinsic property of complex physical systems often leads to abrupt and undesired instabilities. For current-ramped high-field Nb3Sn magnets, frequent flux jumps are observed, which easily causes premature quenches and requires prolonged and resource-intensive magnet training process. In this study, we propose a paradigm-shifting methodology framework that achieves complete suppression of thermomagnetic instabilities through synchronized temperature-modulated critical current density (Jc). Through numerical simulations of flux jumps in multifilamentary Nb3Sn wires at various temperatures, we construct thermomagnetic stability diagram in the Ha-T plane. The simulated results are in good agreement with experiments, confirming that the synchronized temperature ramp-down can fully eliminate flux jumps. We reveal the underlying mechanism of enhancing the thermomagnetic stability arises from that synchronized temperature ramp-down can continuously tune both Jc and its slope. Furthermore, we explore the thermomagnetic instabilities of current-ramped superconducting magnets through large-scale GPU-optimized algorithm. The flux jump and quench diagram in the Ia-T plane are obtained. It indicates that the temperature ramp-down can completely suppress flux jumps without compromising Jc at high magnetic fields. Importantly, this method does not require modifications to the superconducting microstructures or fabrication process, offering a practical and broadly applicable solution. The findings not only provide a robust method for stabilizing various superconducting magnet systems, including high-temperature superconducting magnets wound with second-generated (2G) coated tapes, but also suggest a generalizable strategy for controlling instability in other nonlinear non-equilibrium physical systems. |
| title | Complete suppression of flux instabilities in ramped superconducting magnets with synchronous temperature-modulated Jc |
| topic | Superconductivity Applied Physics |
| url | https://arxiv.org/abs/2505.04159 |