Instabilities of impregnated windings induced by epoxy cracking

Author

Yamashita, T. ; Nishijima, S. ; Takahata, K. ; Okada, T. ; Fukutsuka, T. ; Matsumoto, K. ; Hamada, M.

Author_Institution

ISIR Osaka Univ., Japan

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

1524

Lastpage

1527

Abstract

Changes in the mechanical behaviour and the instabilities of impregnated windings induced by epoxy cracking have been studied in order to establish a methodology for constructing a superconducting magnet. Epoxy cracks are inevitably induced in the process of training. The cracks degrade the rigidity of the superconducting windings, hence the evaluation of epoxy cracks in impregnated windings is important in analyzing the stability of the windings. Test windings in which epoxy cracks were purposely introduced were used, and the degradation and the training behavior were measured before and after crack introduction. Before crack introduction the winding showed training, that is, the quench current increased with quench number. After crack introduction the quench current did not increase with quench number

Keywords

cracks; polymers; stability; superconducting magnets; degradation; epoxy cracking; impregnated windings; instabilities; mechanical behaviour; stability; superconducting magnet; superconducting windings; test windings; training; Degradation; Magnetic field induced strain; Strain measurement; Superconducting coils; Superconducting magnets; Testing; Thermal force; Thermal quenching; Thermal stresses; Wire;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92586

Filename

92586