Title :
Thermal and Electrical Stabilities of Solid Nitrogen (SN2) Cooled YBCO Coated Conductors for HTS Magnet Applications
Author :
Song, J.B. ; Kim, K.J. ; Kim, K.L. ; Lee, J.H. ; Kim, H.M. ; Lee, G.H. ; Chang, H.M. ; Park, D.K. ; Ko, T.K. ; Lee, H.G.
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea
fDate :
6/1/2010 12:00:00 AM
Abstract :
Recently, a cooling system using a solid cryogen such as solid nitrogen (SN2), was introduced for high temperature superconducting (HTS) magnet applications. In order to apply the SN2 cooling system successfully to HTS applications, it is essential to obtain sufficient data regarding the characteristics of the SN2-cooled YBCO-coated conductor (CC), including the thermal and electrical properties. Therefore, this study examined the effect of SN2 on the thermal/electrical stability of YBCO CC tape. The SN2 was produced by conduction cooling using a GM-cryocooler and cooled to 58 K. The voltages and temperatures of the YBCO CC tapes were measured while applying an over-current. The results showed that the thermal and electrical stability of the YBCO CC tape were improved considerably in the SN2 cooling system compared to that in the conduction cooling system.
Keywords :
high-temperature superconductors; nitrogen; overcurrent protection; superconducting magnets; thermal stability; GM-cryocooler; N2; YBCO; YBCO tape temperatures; YBCO tape voltages; conduction cooling system; cooled YBCO coated conductors; electrical stabilities; high temperature superconducting magnet SN2-cooled YBCO-coated conductor; overcurrent appplication; solid cryogen; solid nitrogen; temperature 58 K; thermal stabilities; Over-current; YBCO coated conductor (CC); solid nitrogen (SN2); thermal /electrical stability;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2038172
