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prEN IEC 61788-23:2020

Superconductivity - Part 23: Residual resistance ratio measurement- Residual resistance ratio of cavity-grade niobium superconductors

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IEC 61788-23:202X; prEN IEC 61788-23:2020
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This part of IEC 61788 addresses a test method for the determination of the residual resistance ratio (RRR), RRRr, of cavity-grade niobium. This method is intended for high-purity niobium grades with 150 < RRRr< 600. The test method should be valid for specimens with rectangular or round cross-section, cross-sectional area greater than 1 mm2 but less than 20 mm2, and a length not less than 10 nor more than 25 times the width or diameter.
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