BS EN IEC 61788-23:2018
$167.15
Superconductivity – Residual resistance ratio measurement. Residual resistance ratio of Nb superconductors
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 34 |
IEC 61788-23:2018 addresses a test method for the determination of the residual resistance ratio (RRR) of cavity-grade niobium. The test method should be valid for specimens with rectangular or round cross-section, cross-sectional area greater than 1 mm 2 but less than 20 mm 2, and a length not less than 10 nor more than 25 times the width or diameter.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 7 | English CONTENTS |
| 9 | FOREWORD |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references 3 Terms and definitions |
| 13 | 4 Principle Figures Figure 1 – Relationship between temperature and resistance nearthe superconducting transition |
| 14 | 5 Measurement apparatus 5.1 Mandrel or base plate 5.2 Cryostat and support of mandrel or base plate |
| 15 | 6 Specimen preparation |
| 16 | 7 Data acquisition and analysis 7.1 Data acquisition hardware 7.2 Resistance (R1) at room temperature 7.3 Residual resistance (R2) just above the superconducting transition |
| 18 | 7.4 Validation of the residual resistance measurement 7.5 Residual resistance ratio 8 Uncertainty of the test method 9 Test report 9.1 General 9.2 Test information 9.3 Specimen information |
| 19 | 9.4 Test conditions 9.5 RRR value |
| 20 | Annex A (Informative) Additional information relating to the measurement of RRR A.1 Considerations for specimens and apparatus |
| 21 | A.2 Considerations for specimen mounting orientation A.3 Alternative methods for increasing temperature of specimen above superconducting transition temperature A.3.1 General A.3.2 Heater method A.3.3 Controlled methods A.4 Other test methods A.4.1 General |
| 22 | A.4.2 Measurement of resistance versus time A.4.3 Comparison of ice point and room temperature A.4.4 Extrapolation of the resistance to 4,2 K Figure A.1 – Determination of the value of R2 from a resistance versus time plot |
| 23 | A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K A.4.6 AC techniques |
| 24 | Annex B (informative) Uncertainty considerations B.1 Overview B.2 Definitions B.3 Consideration of the uncertainty concept |
| 25 | 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 |
| 26 | B.4 Uncertainty evaluation example for TC 90 standards Table B.4 – Standard uncertainties of two output signals Table B.5 – Coefficient of variations of two output signals |
| 28 | Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb superconductors C.1 Evaluation of uncertainty C.1.1 Room temperature measurement uncertainty |
| 29 | C.1.2 Cryogenic measurement uncertainty |
| 30 | Figure C.1 – Graphical description of the uncertainty of regression relatedto the measurement of R2 |
| 31 | C.1.3 Estimation of uncertainty for typical experimental conditions C.2 Round robin test summary Table C.1 – Uncertainty of measured parameters |
| 32 | Table C.2 – RRR values obtained by round robin test |
| 33 | Bibliography |
