Inverse analysis of critical current density in a bulk high-temperature superconducting undulator
View / Open Files
Authors
Kinjo, R
Calvi, M
Zhang, K
Hellmann, S
Liang, X
Schmidt, T
Ainslie, MD
Dennis, AR
Durrell, JH
Publication Date
2022Journal Title
Physical Review Accelerators and Beams
ISSN
2469-9888
Publisher
American Physical Society (APS)
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Kinjo, R., Calvi, M., Zhang, K., Hellmann, S., Liang, X., Schmidt, T., Ainslie, M., et al. (2022). Inverse analysis of critical current density in a bulk high-temperature superconducting undulator. Physical Review Accelerators and Beams https://doi.org/10.1103/PhysRevAccelBeams.25.043502
Abstract
In order to optimise the design of undulators using high-temperature superconductor (HTS) bulks we have developed a method to estimate the critical current density (Jc) of each bulk from the overall measured magnetic field of an undulator. The vertical magnetic field was measured along the electron-beam axis in a HTS bulk-based undulator consisting of twenty Gd-Ba-Cu-O (GdBCO) bulks inserted in a 12-T solenoid. The Jc values of the bulks were estimated by an inverse analysis approach in which the magnetic field was calculated by the forward simulation of the shielding currents in each HTS bulk with a given Jc. Subsequently the Jc values were iteratively updated using the pre-calculated response matrix of the undulator magnetic field to Jc. We demonstrate that it is possible to determine the Jc of each HTS bulk with sufficient accuracy for practical application within around 10 iterations. The pre-calculated response matrix, created in advance, enables the inverse analysis to be performed within a practically short time, on the order of several hours. The measurement error, which destroys the uniqueness of the solution, was investigated and the points to be noted for future magnetic field measurements were clarified. The results show that this inverse-analysis method allows the estimation of the Jc of each bulk comprising an HTS bulk undulator.
Sponsorship
CHART (Swiss Accelerator Research and Technology Collaboration);
EPSRC Early Career Fellowship, EP/P020313/1
Funder references
Engineering and Physical Sciences Research Council (EP/P020313/1)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevAccelBeams.25.043502
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335988
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: support@repository.cam.ac.uk