BS EN 61788-11:2011
$142.49
Superconductivity – Residual resistance ratio measurement. Residual resistance ratio of Nb3Sn composite superconductors
| Published By | Publication Date | Number of Pages |
| BSI | 2011 | 26 |
This part of IEC 61788 covers a test method for the determination of the residual resistance ratio (RRR) of Nb3Sn composite superconductors. This method is intended for use with superconductor specimens that have a monolithic structure with rectangular or round cross-section, RRR less than 350 and cross-sectional area less than 3 mm2, and have received a reaction heat-treatment. Ideally, it is intended that the specimens be as straight as possible; however, this is not always the case, thus care must be taken to measure the specimen in its as received condition. All measurements are done without an applied magnetic field.
The method described in the body of this standard is the “reference” method and optional acquisition methods are outlined in Clause A.3.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 7 | INTRODUCTION |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Requirements 5 Apparatus 5.1 Material of measuring base plate 5.2 Length of the measuring base plate 5.3 Cryostat for the resistance, R2, measurement Figures Figure 1 – Relationship between temperature and resistance |
| 10 | 6 Specimen preparation 7 Data acquisition and analysis 7.1 Resistance (R1) at room temperature 7.2 Resistance (R2) just above the superconducting transition |
| 11 | Figure 2 – Voltage (U) versus temperature (T) curves and definitions of each voltage |
| 12 | 7.3 Residual resistance ratio (RRR) |
| 13 | 8 Uncertainty and stability of the test method 8.1 Temperature 8.2 Voltage measurement 8.3 Current 8.4 Dimension 9 Test report 9.1 RRR value 9.2 Specimen |
| 14 | 9.3 Test conditions |
| 15 | Annex A (informative) Additional information relating to the measurement of the residual resistance ratio (RRR) |
| 17 | Annex B (informative) Uncertainty considerations |
| 18 | Tables Table B.1 – Output signals from two nominally identical extensometers Table B.2 – Mean values of two output signals Table B.3 – Experimental standard deviations of two output signals |
| 19 | Table B.4 – Standard uncertainties of two output signals Table B.5 – Coefficient of variations of two output signals |
| 21 | Annex C (informative) Uncertainty evaluation in test method of RRR for Nb3Sn |
| 22 | Table C.1 – Uncertainty of each measurement |
| 23 | Table C.2 – Obtained values of R1, R2 and RRR for three Nb3Sn samples. |
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BS EN 61788-11:2011
Superconductivity – Residual resistance ratio measurement. Residual resistance ratio of Nb3Sn composite superconductors Published By…
