Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Temperature dependency of magnetic field drifts of HTS pancake coils for NMR/MRI applications

  • Choi, Kyeongdal (Department of Energy & Electrical Engineering, Korea Polytechnic University) ;
  • Lee, Seyeon (Department of Energy & Electrical Engineering, Korea Polytechnic University) ;
  • Kim, Woo-Seok (Department of Energy & Electrical Engineering, Korea Polytechnic University) ;
  • Lee, Sang Min (Department of Radiology, CHA Bundang Medical Center, CHA University)
  • Received : 2013.11.20
  • Accepted : 2013.11.26
  • Published : 2013.12.31
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Abstract

We had proposed a winding method so called "Wind-and-Flip", which enables a persistent current operation of an HTS pancake coil without any electrical joint. In order to improve the magnetic field drift characteristics, a prototype HTS coil with the technique was fabricated, and tested under various temperatures. Because the coil doesn't have any electric terminals for current leads, an HTS background magnet was used to induce the persistent current in the coil by field cooling process. A conduction cooling system with a GM cryocooler was prepared to keep the operating temperatures of the prototype coil much below the 77 K. We investigated the magnetic field drift characteristics under the various operating temperatures by measuring the center magnetic field with a cryogenic Hall sensor. The persistent current mode operation at 20 ~ 50K showed a strong possibility of the winding technique for the application such as MRI or NMR.

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References

  1. H. G. Lee, J. G. Kim, S. W. Lee, W. S. Kim, S. W. Lee, K. Choi, G. W. Hong and T. K. Ko, "Design and fabrication of permanent mode magnet by using coated conductor," Physica C 445-448, pp.1099-1102, 2006. https://doi.org/10.1016/j.physc.2006.05.044
  2. Y. S. Kim, Y. S. Yoon, S. E. Yang, D. K. Park, M. C. Ahn, and T. K. Ko, "Characteristics Analysis of a Small Scale Persistent Current Switch System by using Coated Conductor," Journal of the Korea Ins. Applied Superconductivity, Vol. 9, No. 1, pp.47-52, 2007.
  3. Y. Iwasa, S. Hahn, M. Tomita, H. Lee, and J. Bascunan, "A Persistent-Mode Magnet Comprised of YBCO Annuli," IEEE Trans. on Applied Superconductivity, Vol. 15. No. 2, pp. 2352-2355, 2005. https://doi.org/10.1109/TASC.2005.849664
  4. W. S. Kim, C. Park, S. H. Park, J. Lee, J. B. Song, H. Lee, H. G. Lee, G. W. Hong, and K. Choi, "Magnetic field stability of a small YBCO magnet in persistent current mode," IEEE Trans. on Applied Superconductivity, Vol. 19, No. 3, pp.2194-2197, 2009. https://doi.org/10.1109/TASC.2009.2018750
  5. S. Kim, Y. Kim, S. H. Park, J. K. Lee, J. H Han, G. W. Hong, I. H. Park, C. Park, and K .Choi, "Characteristics of an HTS pancake coil in persistent current mode using wind-and-flip winding method," IEEE Trans. on Applied Superconductivity, Vol. 23, Issue 3, Part 2, Article #4601305, 2013.

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  1. Study on elimination of screening-current-induced field in pancake-type non-insulated HTS coil vol.29, pp.3, 2016, https://doi.org/10.1088/0953-2048/29/3/035009