Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
권호 표지
DOI QR코드

DOI QR Code

Statistical analysis for HTS coil considering inhomogeneous Ic distribution of HTS tape

  • Received : 2015.02.23
  • Accepted : 2015.06.16
  • Published : 2015.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Critical current of high-temperature superconducting (HTS) coil is influenced by its own self magnetic field. Direction and density distribution of the magnetic field around the coil are fixed after the shape of the coil is decided. If the entire part of the HTS tape has homogeneous $I_c$ distribution characteristic, quench would be initiated in fixed location on the coil. However, the actual HTS tape has inhomogeneous $I_c$ distribution along the length. If the $I_c$ distribution of the HTS tape is known, we can expect the spot within the HTS coil that has the highest probability to initiate the quench. In this paper, $I_c$ distribution within the HTS coil under self-field effect is simulated by MATLAB. In the simulation procedure, $I_c$ distribution of the entire part of the HTS tape is assume d to follow Gaussian-distribution by central limit theorem. The HTS coil model is divided into several segments, and the critical current of each segment is calculated based on the-generalized Kim model. Single pancake model is simulated and self-field of HTS coil is calculated by Biot-Savart's law. As a result of simulation, quench-initiating spot in the actual HTS coil can be predicted statistically. And that statistical analysis can help detect or protect the quench of the HTS coil.

Keywords

References

  1. L. Xiao et al., "Fabrication and Tests of a 1 MJ HTS Magnet for SMES," IEEE Transactions on applied superconductivity., vol. 18, No. 2, 2008.
  2. J. Bascunan et al., "An LTS/HTS NMR Magnet Operated in the Range 600-700 MHz," IEEE Transactions on applied superconductivity., vol. 17, No. 2, 2007.
  3. J. Lehtonen, R. Mikkonen and J. Paasi, "A numerical model for stability considerations in HTS magnets," Supercond. Sci. Technol., vol. 13, pp. 251-258, 2000. https://doi.org/10.1088/0953-2048/13/3/301
  4. K. W. Nam, C. J. Lee, D. K. Park, T. K. Ko and B. Y. Seok, "Thermal and Electrical Analysis of Coated Conductor Under AC Over-Current," IEEE Transactions on applied superconductivity., vol. 17, No. 2, 2007.
  5. S. P. Virostek, M. A. Green, F. Trillaud and M. S. Zisman, "Fabrication, Testing and Modeling of the MICE Superconducting Spectrometer Solenoids," IPAC'10, Kyoto, Japan, May. 2010.
  6. Yuri V. Cherpak et al., "Critical Current Density of HTS Single Crystal YBCO Thin Films in Applied dc Field," IEEE Transactions on applied superconductivity., vol. 15, No. 2, 2005.
  7. Mark D. Ainslie, D. Hu, J. Zou and David A. Cardwell, "Simulating and the In-Field AC and DC Performance for High-Temperature Superconducting Coils," IEEE Transactions on applied superconductivity., vol. 25, No. 3, 2015.
  8. http://www.amsc.com/library/AMPIcBT_AN_A4_0112.pdf