1. Fast and efficient critical state modelling of field-cooled bulk high-temperature superconductors using a backward computation method
- Author
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Thomas Schmidt, Mark D. Ainslie, Kai Zhang, Marco Calvi, Ryota Kinjo, Sebastian Hellmann, Zhang, K [0000-0002-3830-9682], Ainslie, Mark [0000-0003-0466-3680], Calvi, M [0000-0002-2502-942X], Apollo - University of Cambridge Repository, Zhang, Kai [0000-0002-3830-9682], and Calvi, Marco [0000-0002-2502-942X]
- Subjects
Paper ,CompactLight ,High-temperature superconductivity ,Field (physics) ,Computation ,FOS: Physical sciences ,Applied Physics (physics.app-ph) ,01 natural sciences ,Magnetization ,law.invention ,Superconductivity (cond-mat.supr-con) ,ANSYS ,law ,0103 physical sciences ,Materials Chemistry ,media_common.cataloged_instance ,Early career ,Electrical and Electronic Engineering ,European union ,010306 general physics ,media_common ,Critical State Model ,010302 applied physics ,Physics ,Condensed Matter - Superconductivity ,HTS Modelling ,Metals and Alloys ,Backward Computation ,Physics - Applied Physics ,Undulator ,Condensed Matter Physics ,Focus on The Jan Evetts SUST Award 2020 ,Computational physics ,Bulk Superconductors ,Ceramics and Composites ,H-formulation - Abstract
A backward computation method has been developed to accelerate modelling of the critical state magnetization current in a staggered-array bulk high-temperature superconducting (HTS) undulator. The key concept is as follows: i) a large magnetization current is first generated on the surface of the HTS bulks after rapid field-cooling (FC) magnetization; ii) the magnetization current then relaxes inwards step-by-step obeying the critical state model; iii) after tens of backward iterations the magnetization current reaches a steady state. The simulation results show excellent agreement with the H-formulation method for both the electromagnetic and electromagnetic-mechanical coupled analyses, but with significantly faster computation speed. Solving the FEA model with 1.8 million degrees of freedom (DOFs), the backward computation method takes less than 1.4 hours, an order of magnitude or higher faster than other state-of-the-art numerical methods. Finally, the models are used to investigate the influence of the mechanical stress on the distribution of the critical state magnetization current and the undulator field along the central axis., 12 pages, 7 figures
- Published
- 2020