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eLibrary > BS EN IEC 61788-23:2024 Superconductivity - Residual resistance ratio measurement. Residual resistance ratio of cavity-grade Nb superconductors >

BS EN IEC 61788-23:2024 Superconductivity - Residual resistance ratio measurement. Residual resistance ratio of cavity-grade Nb superconductors, 2024

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BS EN IEC 61788-23:2024 Superconductivity - Residual resistance ratio measurement. Residual resistance ratio of cavity-grade Nb superconductors, 2024

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
Figures [Go to Page]
Figure 1 – Relationship between temperature and resistance near the superconducting transition
5 Measurement apparatus [Go to Page]
5.1 Mandrel or base plate
5.2 Cryostat and support of mandrel or base plate
6 Specimen preparation
7 Data acquisition and analysis [Go to Page]
7.1 Data acquisition hardware
7.2 Resistance (R1) at room temperature
7.3 Residual resistance (R2) just above the superconducting transition
7.4 Validation of the residual resistance measurement
7.5 Residual resistance ratio
8 Uncertainty of the test method
9 Test report [Go to Page]
9.1 General
9.2 Test information
9.3 Specimen information
9.4 Test conditions
9.5 RRR value
Annex A (informative) Additional information relating to the measurement of RRR [Go to Page]
A.1 Considerations for specimens and apparatus
A.2 Considerations for specimen mounting orientation
A.3 Alternative methods for increasing temperature of specimen above superconducting transition temperature [Go to Page]
A.3.1 General
A.3.2 Heater method
A.3.3 Controlled methods
A.4 Other test methods [Go to Page]
A.4.1 General
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 [Go to Page]
A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K
A.4.6 AC techniques
Annex B (informative)Uncertainty considerations [Go to Page]
B.1 Overview
B.2 Definitions
B.3 Consideration of the uncertainty concept
Tables [Go to Page]
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
Table B.4 – Standard uncertainties of two output signals
Table B.5 – Coefficients of variation of two output signals
B.4 Uncertainty evaluation example for IEC TC 90 standards
Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb superconductors [Go to Page]
C.1 Evaluation of uncertainty [Go to Page]
C.1.1 Room temperature measurement uncertainty
C.1.2 Cryogenic measurement uncertainty
C.1.3 Estimation of uncertainty for typical experimental conditions
Figure C.1 – Graphical description of the uncertainty of regression related to the measurement of R2
Table C.1 – Uncertainty of measured parameters
C.2 Inter-laboratory comparison summary
Table C.2 – RRR values obtained by inter-laboratory comparison using liquid helium
Bibliography [Go to Page]

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