Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Influence of multiple holes on the magnetic properties of YBCO superconductor

  • Oh, W.S. (Department of Advanced materials Materials Engineering, Chungbuk National University) ;
  • Oh, S.K. (Department of Advanced materials Materials Engineering, Chungbuk National University) ;
  • Jang, G.E. (Department of Advanced materials Materials Engineering, Chungbuk National University) ;
  • Kim, C.J. (Korea Atomic Energy Research Institute Superconductor Laboratory) ;
  • Han, Y.H. (Korea Electric Power Research Institute) ;
  • Jung, S.Y. (Korea Electric Power Research Institute) ;
  • Sung, T.H. (Korea Electric Power Research Institute)
  • Published : 2009.05.31
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Abstract

Bulk $YBa_2Cu_3O_{7-{\delta}}$ (YBCO) superconductor was manufactured with the top-seeded melt grown method. The 9, 16, and 25 holes, as small as 0.7mm in diameter, parallel to the c-axis were mechanically drilled. Magnetic flux mapping and levitation force were measured and compared to estimate the influence of multiple holes on the magnetic properties of YBCO superconductor at 77K. According to the measurements, the maximum magnetic flux density obtained from the plain sample was 2.48kG, while the maximum magnetic flux density of the sample with 25 holes was low as around 2.29kG. The levitation force measured on the sample with 9 holes increased from 91N to 105N. The levitation force measured on the samples with 9 holes is relatively higher than the plain sample without any holes. In this case, increase of the levitation force in the perforated samples could be explained by enhancement of the cooling efficiency more effectively. We investigated that the magnetic properties of YBCO superconductor were strongly influenced by the artificial holes.

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References

  1. N. Sakai, S. J. Seo, K. Inoue, T. Miyamoto, M. Murakami, "Mechanical properties of RE-Ba-Cu-O bulk superconductors", Physica C 335, pp.107, 2000 https://doi.org/10.1016/S0921-4534(00)00153-2
  2. D. Isfort, X. Chaud, R. Tournier, G. Kapelski. "Cracking and oxygenation of YBaCuO bulk superconductors: application to c-axis element for current limitation", Physica C 390, pp.341, 2003 https://doi.org/10.1016/S0921-4534(03)00740-8
  3. M. Tomita, M. Murakami, "High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29K", Nature 421, pp.517, 2003 https://doi.org/10.1038/nature01350
  4. M. Tomita, M. Murakami, K. Katagiri, "Reliability of mechanical properties for bulk superconductors with resin impregnation" Physica C 378-381, pp.783, 2002 https://doi.org/10.1016/S0921-4534(02)01543-5
  5. M. Tomita, M. Murakami, "Effect of resin impregnation on the prevention of crack propagation for bulk Y-Ba-Cu-O superconductors" Physica C 392-396, pp.562, 2003 https://doi.org/10.1016/S0921-4534(03)01000-1
  6. M. Murakami, M. Morita, K. Doi and K. Miyamoto, "A New Process with the Promise of High $J_{c}$ in Oxide Superconductors" Jpn. J.Appl. Phys. 28, pp.1189, 1989 https://doi.org/10.1143/JJAP.28.1189
  7. Ph. Laurent, J-P. Mathieu, B. Mattivi, J-F. Fagnard, S. Meslin, J. G. Noudem, M. Ausloos, R. Cloots, Ph. Vanderbemden, "Study by Hall probe mapping of the trapped flux modification produced by local heating in YBCO HTS bulks for different surfce/volume ratios" Supercond. Sci. Technol. 18, pp.1047, 2005 https://doi.org/10.1088/0953-2048/18/8/004
  8. J. G. Noudem, S. Meslin, D. Horvath, C. Hamois, D. Chateigner, S. Eve, M. Gomina , X. Chaud, M. Murakami, "Fabrication of textured YBCO bulk with artificial holes" Physica C 463, pp.301, 2007 https://doi.org/10.1016/j.physc.2007.03.503
  9. G. E. Jang, W. S. Oh, Y.H. Han, S.Y. Jung, T.H Sung, "The effect of impregnation by resin and CNT compound on the mechanical and magnetic properties of YBCO superconductor", Physica C 468, pp.1444, 2008 https://doi.org/10.1016/j.physc.2008.05.252
  10. C. J. Kim, Y. A. Jee, G. W. Hong, T. H. Sung, Y. H. Han, S. C. Han, S. J. Kim, W. Bieger, G. Fuchs, "Effects of the seed dimension on the top surface growth mode and the magnetic properties of top-seeded melt growth processed YBCO superconductors", Physica C 331, pp.274, 2000 https://doi.org/10.1016/S0921-4534(00)00018-6