Fast and efficient critical state modelling of field-cooled bulk high-temperature superconductors using a backward computation method
Publication Date
2020Journal Title
Superconductor Science and Technology
ISSN
0953-2048
Publisher
IOP Publishing
Volume
33
Issue
11
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Zhang, K., Ainslie, M., Calvi, M., Hellmann, S., Kinjo, R., & Schmidt, T. (2020). Fast and efficient critical state modelling of field-cooled bulk high-temperature superconductors using a backward computation method. Superconductor Science and Technology, 33 (11) https://doi.org/10.1088/1361-6668/abb78a
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.
Keywords
Paper, Focus on The Jan Evetts SUST Award 2020, HTS modelling, backward computation, critical state model, ANSYS, H-formulation, magnetization, bulk superconductors, undulator
Sponsorship
European Union's Horizon2020 Research & Innovation Program, Grant Agreement No. 777431
EPSRC Early Career Fellowship, EP/P020313/1
Funder references
Engineering and Physical Sciences Research Council (EP/P020313/1)
Identifiers
sustabb78a, abb78a, sust-104085.r1
External DOI: https://doi.org/10.1088/1361-6668/abb78a
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333687
Rights
Licence:
http://creativecommons.org/licenses/by/4.0
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