Normal Zone Initiation and Propagation Characteristics of a Solid Nitrogen Cooled GdBCO Racetrack Pancake Coil

Author

Song, Ju Bin ; Kim, Kwang Lok ; Yang, D.G. ; Jang, Joo Young ; Ko, Tae Kuk ; Ahn, M.C. ; Lee, H.G.

Author_Institution

Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea

Volume

22

Issue

3

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

4701704

Lastpage

4701704

Abstract

This paper presents quench test results, of both experiment and simulation, of a racetrack pancake coil wound with a GdBCO-coated conductor tape in a solid nitrogen (SN2) cooling system at 58 K. The longitudinal normal zone propagation velocities in the curved section were 2 times faster than those in the straight section. Therefore, the straight section should be protected more than the curved section when using racetrack-type, GdBCO pancake coils in large-scale rotating machines. The simulated results showed good agreement with the experimentally observed normal zone initiation times.

Keywords

barium compounds; cooling; gadolinium compounds; nitrogen; superconducting coils; superconducting machines; superconducting magnets; superconducting tapes; conductor tape; large-scale rotating machines; longitudinal normal zone propagation velocities; normal zone initiation characteristics; normal zone initiation times; normal zone propagation characteristics; solid nitrogen cooled racetrack pancake coil; solid nitrogen cooling system; straight section; temperature 58 K; Coils; Cooling; Heating; Integrated circuits; Solids; Testing; Thermal stability; GdBCO; normal zone propagation (NZP); protection; racetrack pancake (RP) coil; solid nitrogen (SN2);

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2011.2180282

Filename

6107558