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Open Source Codes for Computing the Critical Current of Superconducting Devices
Víctor M. R. Zermeño, Salman Quaiyum, Francesco Grilli
The Institute for Technical Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany
E-mail: [email protected]
Abstract — In order to transport sufficiently high current, high-temperature superconductor (HTS) tapes are assembled in cable structures of different forms. In such cables, the tapes are tightly packed and have a strong electromagnetic interaction. In particular, the generated self-field is quite substantial and can give an important contribution in reducing the maximum current the cable can effectively carry. In order to be able to predict the critical current of said cable structures, a static numerical model has been recently proposed. In this contribution, we present in detail the implementation of such models in different programming environments, including finite-element-based and general numerical analysis programs, both commercial an open-source.
A comparison of the accuracy and calculation speed of the different implementations of the model is carried out for the case of a Roebel cable. The model is also used to evaluate the importance of choosing a very accurate description of the angular Jc(B) dependence of the superconductor as input for the material’s property.
The numerical codes, which are open-source, are made freely available to interested users.
A comparison of the accuracy and calculation speed of the different implementations of the model is carried out for the case of a Roebel cable. The model is also used to evaluate the importance of choosing a very accurate description of the angular Jc(B) dependence of the superconductor as input for the material’s property.
The numerical codes, which are open-source, are made freely available to interested users.
This work has been partly supported by the Helmholtz Association (Young Investigator Group grant VH-NG-617). The authors are especially thankful to Prof. Frédéric Hecht who provided valuable support for using FreeFEM++.
Keywords (Index Terms) — Critical current, superconducting cables, self-field effects, numerical simulations, open source.
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), January 2016.
Submitted November 17, 2015; Selected November 20, 2015. Reference No. ST/STP495; Category 6,12.
This invited poster presentation 3A-LS-O1.9 was given at EUCAS 2015. The final paper version was published online in IEEE Trans. Appl. Supercond. (IEEE Xplore) DOI: 10.1109/TASC.2016.2521171, April 2016.
Submitted November 17, 2015; Selected November 20, 2015. Reference No. ST/STP495; Category 6,12.
This invited poster presentation 3A-LS-O1.9 was given at EUCAS 2015. The final paper version was published online in IEEE Trans. Appl. Supercond. (IEEE Xplore) DOI: 10.1109/TASC.2016.2521171, April 2016.