Index Loss Effect in n-Value Measurements of Commercial Superconductors

被引：5

作者：

Lvovsky, Yuri ^{[1
]}

机构：

[1] Gen Elect Healthcare, Florence, SC 29501 USA

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2009年 / 19卷 / 03期

关键词：

Ic measurement; index loss; n-value; stability crisis; superconductor;

D O I：

10.1109/TASC.2009.2019041

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：

n-value of the superconductor is key parameter in the persistent magnet design, affecting cost and performance. Analysis is presented that shows that a few mK overheat from the nonlinear index loss during standard Ic measurement of NbTi and Nb3Sn conductors in the helium bath can significantly affect the measurements and produce artificially high n-values. The error increases in conductors with higher n. Effect of low heat transfer, E-ref criterion and index stability crisis are discussed. Analytical correlation is presented between the apparent and actual n-values.

引用

页码：2313 / 2316

页数：4

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