BS EN 61788-5:2013
$142.49
Superconductivity – Matrix to superconductor volume ratio measurement. Copper to superconductor volume ratio of Cu/Nb-Ti composite superconducting wires
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 30 |
IEC 61788-5:2013 covers a test method for the determination of copper to superconductor volume ratio of Cu/Nb-Ti composite superconducting wires. This test method and the alternate method in Annex are intended for use with Cu/Nb-Ti composite superconducting wires with a cross-sectional area of 0,1 mm2 to 3 mm2, a diameter of the Nb-Ti filament(s) of 2 micrometers to 200 micrometers, and a copper to superconductor volume ratio of 0,5 or more. The Cu/Nb-Ti composite test conductor discussed in this method has a monolithic structure with a round or rectangular cross-section. This test method is carried out by dissolving the copper with nitric acid. Deviations from this test method that are allowed for routine tests and other specific restrictions are given in this standard. Cu/Nb-Ti composite superconducting wires beyond the limits in the cross-sectional area, the filament diameter and the copper to superconductor volume ratio could be measured with this present method with an anticipated reduction of uncertainty. Other, more specialized, specimen test geometries may be more appropriate for conductors beyond the limits and have been omitted from this present standard for simplicity and to retain low uncertainty. The test method given in this standard is expected to apply to other superconducting composite wires after some appropriate modifications. The copper to superconductor volume ratio of composite superconductors is used mainly to calculate the critical current density of superconducting wires. The test with the method given in this International Standard may be used to provide part of the information needed to determine the suitability of a specific superconductor. Moreover, this method is useful for quality control, acceptance or research testing if the precautions given in this standard are observed. This second edition cancels and replaces the first edition published in 2000. It constitutes a technical revision. The main revisions are the addition of two new annexes, “Uncertainty considerations” (Annex E) and “Uncertainty evaluation in test method of copper to superconductor volume ratio of Cu/Nb-Ti composite superconductors” (Annex F).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 7 | INTRODUCTION |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Principle 5 Chemicals 6 Apparatus |
| 10 | 7 Measurement procedure 7.1 Quantity of specimen 7.2 Removal of insulating cover material 7.3 Cleaning 7.4 Drying 7.5 Measurement of specimen mass and its repetition 7.6 Dissolving copper |
| 11 | 7.7 Cleaning and drying the Nb-Ti filaments 7.8 Measurement of dissolved specimen mass and its repetition |
| 12 | 7.9 Procedural repetition for second specimen 8 Calculation of results 9 Uncertainty of the test method |
| 13 | 10 Test report 10.1 Identification of test specimen 10.2 Report of copper to superconductor volume ratio 10.3 Report of test conditions |
| 14 | Annex A (normative) Copper to superconductor volume ratio – copper mass method |
| 16 | Annex B (informative) Specific mass depending on Nb-Ti fraction Tables Table B.1 – Specific mass of Nb-Ti |
| 17 | Annex C (information) Mechanical removal of insulating cover materials |
| 18 | Annex D (informative) Second etch of specimen |
| 19 | Annex E (informative) Uncertainty considerations |
| 20 | Table E.1 – Output signals from two nominally identical extensometers Table E.2 – Mean values of two output signals Table E.3 – Experimental standard deviations of two output signals |
| 21 | Table E.4 – Standard uncertainties of two output signals Table E.5 – Coefficient of variations of two output signals |
| 24 | Annex F (informative) Uncertainty evaluation in the test method of copper to superconductor volume ratio of Cu/Nb-Ti composite superconductors |
