Instability of superconducting racetrack magnets

Author

Ikizawa, K. ; Takasu, N. ; Murayama, Y. ; Seo, K. ; Nishijima, S. ; Katagiri, K. ; Okada, T.

Author_Institution

NKK Corp., Kawasaki, Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

2128

Lastpage

2131

Abstract

The training and degradation behavior of superconducting racetrack-shaped magnets were studied for use in a high-performance superconducting wiggler. Several small magnets that were fabricated with NbTi multifilamentary superconductor and impregnated with epoxy resin were tested by changing the winding tension, aspect ratio of the magnets, and copper ratio of the superconductor. The acoustic emission signals were monitored during the tests. The correlation between training/degradation behavior and fabrication condition of the magnets was studied. The test magnets that had the smaller aspect ratio, a low winding tension, and a high copper ratio and were impregnated with epoxy resin showed no premature quenches and reached critical current at first charging

Keywords

composite superconductors; critical currents; niobium alloys; superconducting magnets; titanium alloys; NbTi; acoustic emission signals; aspect ratio; copper ratio; critical current; degradation behavior; epoxy resin; fabrication condition; multifilamentary superconductor; superconducting racetrack magnets; superconducting wiggler; training; winding tension; Acoustic emission; Acoustic testing; Copper; Degradation; Epoxy resins; Multifilamentary superconductors; Niobium compounds; Superconducting magnets; Titanium compounds; Undulators;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133632

Filename

133632