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BS EN IEC 61788-23:2024

BS EN IEC 61788-23:2024

$167.15

Superconductivity – Residual resistance ratio measurement. Residual resistance ratio of cavity-grade Nb superconductors

Published By Publication Date Number of Pages
BSI 2024 34
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IEC 61788-23:2024 is available as IEC 61788-23:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61788-23:2024 addresses a test method for the determination of the residual resistance ratio (RRR), rRRR, of cavity-grade niobium. This method is intended for high-purity niobium grades with 150 < rRRR < 600. The test method is valid for specimens with rectangular or round cross-section, cross-sectional area greater than 1 mm2 but less than 20 mm2, 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
6 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
3 Terms and definitions
12 4 Principle
Figures
Figure 1 – Relationship between temperature and resistance near the superconducting transition
13 5 Measurement apparatus
5.1 Mandrel or base plate
5.2 Cryostat and support of mandrel or base plate
14 6 Specimen preparation
15 7 Data acquisition and analysis
7.1 Data acquisition hardware
7.2 Resistance (R1) at room temperature
16 7.3 Residual resistance (R2) just above the superconducting transition
17 7.4 Validation of the residual resistance measurement
7.5 Residual resistance ratio
8 Uncertainty of the test method
18 9 Test report
9.1 General
9.2 Test information
9.3 Specimen information
9.4 Test conditions
9.5 RRR value
19 Annex A (informative) Additional information relating to the measurement of RRR
A.1 Considerations for specimens and apparatus
20 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
21 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
22 A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K
A.4.6 AC techniques
23 Annex B (informative)Uncertainty considerations
B.1 Overview
B.2 Definitions
24 B.3 Consideration of the uncertainty concept
Tables
Table B.1 – Output signals from two nominally identical extensometers
Table B.2 – Mean values of two output signals
25 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
26 B.4 Uncertainty evaluation example for IEC TC 90 standards
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
31 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
32 C.2 Inter-laboratory comparison summary
Table C.2 – RRR values obtained by inter-laboratory comparison using liquid helium
33 Bibliography

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