Current distribution in a 12 strand Nb/sub 3/Sn CICC and its influence on ramp rate limitation

Author

Vysotsky, V.S. ; Takayasu, M. ; Michael, P.C. ; Schultz, J.H. ; Minervini, J.V. ; Sangkwon Jeong

Author_Institution

Inst. of Superconductivity & Solid State Phys., Kurchatov (I.V.) Inst. of Atomic Energy, Moscow, Russia

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

774

Lastpage

777

Abstract

Direct measurements of the current in each strand of a chrome coated Nb/sub 3/Sn CICC were performed during current and/or external magnetic field ramps. Severe non-uniformity of the strand currents was found immediately before quench. The currents in some of the strands were also observed to change abruptly at various points during external field ramps. The observed peculiarities of the strands\´ current behaviors are considered in the present paper and a simple "ad hoc" model of the ramp rate limitation phenomenon is proposed based on the hypothesis that current non-uniformity is a main cause of RRL. This model is compared with the experimental results.

Keywords

current distribution; niobium alloys; superconducting cables; tin alloys; Nb/sub 3/Sn; chrome coating; current distribution; magnetic field; multistrand Nb/sub 3/Sn CICC; quench; ramp rate limitation; superconducting cable-in-conduit cable; Coils; Critical current; Current distribution; Current measurement; Niobium; Power cables; Temperature; Testing; Tin; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.614618

Filename

614618