GB/T 21546-2008Critical current measurement -- DC critical current of Nb-Ti composite superconductors (English PDF)

GB/T 21546-2008 is the English-translated version of 铌钛复合超导体的直流临界电流测量.

GB/T 21546-2008 — This standard applies to the determination of copper-Super ratio greater than 1 DC critical current of Cu/Nb-Ti composite superconductors, are equally applicable to the determination of niobium titanium wire core diameter greater than 1��m, Copper-Ultra ratio greater than 0.

9, copper-nickel alloy-superconductor ratio is greater than 0. 2 Cu/Cu Ni/Nb-Ti superconducting wire DC critical current.

Needed due to the Cu/Nb-Ti composite superconductors and copper/copper-nickel/niobium titanium superconductor critical current two slightly different test methods, the standard Annex C (normative) will introduce the measure copper/copper-nickel/niobium titanium superconductor Special to comply.

This standard test method is applicable under standard test conditions in which the magnetic superconductor is less than or equal to 0. 7 times the upper critical field, critical current of less than 1000A, n is greater than the superconductor 12.

Measurement, the sample should be immersed in liquid helium at a known temperature. Conductor should be tested for the integration of superconducting wire circular or rectangular cross-section, the cross-sectional area of ??less than 2 mm 2.

The sample should have a helical coil geometry. This standard is also given in daily testing of the experimental method allowed deviation and other specifically defined.

The critical current is greater than 1000A or greater than 2 mm 2 cross-sectional area of ??the conductor can also use this method of measurement, but the measurement uncertainty will increase, and the self-field effect is more pronounced.

Furthermore, in order to maintain a simple and relatively low measurement uncertainty, this standard does not involve special sample shape for large conductor cross-section may be more suitable.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

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