Title :
Flux Pinning Properties of Columnar Defects Nucleated by Heavy Ion Irradiation in DyBCO Coated Conductor
Author :
Kiuchi, Masaru ; Isobe, G. ; Matsushita, T. ; Okayasu, S. ; Prusseit, W.
Author_Institution :
Fac. of Comput. Sci. & Syst. Eng., Kyushu Inst. of Technol., Iizuka, Japan
fDate :
6/1/2009 12:00:00 AM
Abstract :
Flux pining properties of columnar defects nucleated by gold ion irradiation was investigated for DyBCO coated conductor. The energy of irradiated gold ions was 320 MeV and 200 MeV and the matching field was 1.0 and 2.0 T, respectively. It was found that the flux pinning strength was significantly enhanced at high magnetic fields. These experimental results were analysed using the summation theory of the elementary pinning forces with the theoretical model of flux creep and flow. It was found that the experimental results can be explained by the theories. The obtained result suggests that columnar defects with larger radius are more effective for pinning because of the larger probability of catching flux lines.
Keywords :
barium compounds; dysprosium compounds; flux creep; flux flow; flux pinning; high-temperature superconductors; ion beam effects; DyBCO coated conductor; DyBaCuO; catching flux lines; columnar defects; electron volt energy 200 MeV; electron volt energy 320 MeV; flux creep; flux flow; flux pinning properties; gold ion irradiation; summation theory; Columnar defects; DyBCO coated conductor; critical current density; flux pinning;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2018733
