Hot Spot Behavior of Y123 Coated Conductors

Author

Awaji, S. ; Hou, Y. ; Oguro, H. ; Watanabe, K. ; Inoue, I. ; Sakamoto, H. ; Yasunaga, S. ; Ryu, J.

Author_Institution

High Field Lab. for Supercond. Mater., Tohoku Univ., Sendai, Japan

Volume

22

Issue

3

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

6601004

Lastpage

6601004

Abstract

We measured the time evolution of voltage and temperature of a CVD-Y123 coated conductor monolayer coil with Cu stabilizer under the cryocooled condition. The thermal runaway occurred locally at operate currents of 1.05-1.3 at 38 K and 1-10 T. In this case, the hot spot originated from the inhomogeneity of was observed. The thermal runaway generated from different parts of the tape at high and low fields at 38 K, respectively. This is due to the different heating behavior related to the distribution. The critical heating power of the thermal runaway obtained in this study were about 30 mW at 38 K and 10 T. It weakly depends on magnetic filed but is independent to the temperature. The analysis suggests that the cooling condition for the transient phenomena such as the thermal runaway is poor.

Keywords

barium compounds; critical current density (superconductivity); high-temperature superconductors; superconducting coils; type II superconductors; yttrium compounds; CVD-Y123 coated conductor; Cu stabilizer; YBa₂Cu₃O₇; critical heating power; cryocooled condition; hot spot; monolayer coil; thermal runaway; Conductors; Critical current; Heating; High temperature superconductors; Integrated circuits; Superconducting magnets; Thermal stability; Critical current; high temperature superconducting wires; hot spot; thermal stability;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2011.2176710

Filename

6084711