Title :
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
fDate :
6/1/1997 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
