Current ripple effect on n-value

被引：2

作者：

Goodrich, L. F. ^{[1
]}

Splett, J. D. ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2007年 / 17卷 / 02期

关键词：

critical current measurement; current ripple; niobium compound; superconducting wires;

D O I：

10.1109/TASC.2007.899592

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We systematically studied the effect of current ripple on the determination of n-value, which is the index of the shape of the electric field-current (E - I) curve. Commercial Nb3Sn wires were measured with controlled amounts of ac ripple. Substitution-box, superconductor simulator circuits were also measured. A battery-powered current supply was used to provide the dc with ripple currents. The ripple frequencies were 60, 120, and 360 Hz, to represent common electrical power harmonics in high-current power supplies. A previous study focused on the effect of ripple on the determination of dc critical current (I-c); the current study focuses on how ripple changes the n-value and shows that ripple has a larger effect on n-value than on I-c. We examined models and measurements on simulators to reproduce and explain the effects observed in measurements on superconductors. Current ripple and spikes may be sources of differences in n-values measured at different laboratories.

引用

页码：2603 / 2606

页数：4

共 6 条

[1] CURRENT RIPPLE EFFECT ON SUPERCONDUCTIVE DC CRITICAL CURRENT MEASUREMENTS [J].