Thermal behavior of a solid nitrogen impregnated high-temperature superconducting pancake test coil under transient heating

Author

Isogami, Hisashi ; Haid, Benjamin J. ; Iwasa, Yukikazu

Author_Institution

Francis Bitter Nat. Magnet Lab., MIT, Cambridge, MA, USA

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1852

Lastpage

1855

Abstract

This paper presents experimental and analytical results on a solid nitrogen impregnated high-temperature superconducting (HTS) test coil under transient heating. The test coil is a 1-layer, 10-turn single-pancake wound with Bi2223/Ag composite tape, 9-mm wide and 0.5-mm thick, with an average winding diameter of 105 mm. The solid nitrogen impregnating the 0.38-mm turn-to-turn radial gaps in the winding enhances the winding´s overall heat capacity significantly in the operating temperature range 30-40 K and thereby limits the test coil´s temperature rise when it is subjected to overcurrent pulses. The presence of solid nitrogen within the winding improves stability against fault-mode overcurrent pulses for HTS magnets used in electric power devices

Keywords

bismuth compounds; calcium compounds; high-temperature superconductors; nitrogen; silver; strontium compounds; superconducting coils; superconducting device testing; superconducting tapes; 0.38 mm; 0.5 mm; 1-layer 10-turn single-pancake coil; 105 mm; 30 to 40 K; 9 mm; Bi2223/Ag composite tape; Bi₂Sr₂Ca₂Cu₃O-Ag; N; electric power devices; fault-mode overcurrent pulses; heat capacity; overcurrent pulses; solid nitrogen impregnated HTS coil; stability; superconducting pancake test coil; thermal behavior; transient heating; turn-to-turn radial gaps; Heating; High temperature superconductors; Nitrogen; Solids; Superconducting coils; Superconducting films; Superconducting magnets; Temperature distribution; Testing; Transient analysis;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920209

Filename

920209