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BSI 23/30473276 DC 2023

BSI 23/30473276 DC 2023

$13.70

BS EN IEC 61788-23. Superconductivity – Part 23. Residual resistance ratio measurement. Residual resistance ratio of cavity-grade Nb superconductors

Published By Publication Date Number of Pages
BSI 2023 31
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PDF Catalog

PDF Pages PDF Title
1 30473276-NC.pdf
3 90_503e_CDV.pdf
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principle
11 5 Measurement apparatus
5.1 Mandrel or base plate
5.2 Cryostat and support of mandrel or base plate
12 6 Specimen preparation
13 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
15 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
16 9.3 Specimen information
9.4 Test conditions
9.5 RRR value
17 Annex A (informative) Additional information relating to the measurement of RRR
A.1 Considerations for specimens and apparatus
18 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
19 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
20 A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K
A.4.6 AC techniques
21 Annex B (informative) Uncertainty considerations
B.1 Overview
B.2 Definitions
22 B.3 Consideration of the uncertainty concept
24 B.4 Uncertainty evaluation example for IEC TC 90 standards
26 Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb superconductors
C.1 Evaluation of uncertainty
C.1.1 Room temperature measurement uncertainty
27 C.1.2 Cryogenic measurement uncertainty
29 C.1.3 Estimation of uncertainty for typical experimental conditions
30 C.2 Inter-laboratory comparison summary
31 Bibliography

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BSI 23/30473276 DC 2023
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