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BS EN IEC 61788-23:2021 – TC

BS EN IEC 61788-23:2021 – TC

$217.84

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

Published By Publication Date Number of Pages
BSI 2021 74
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This part of IEC 61788 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
1 30447218
39 A-30390198
40 undefined
43 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
45 English
CONTENTS
47 FOREWORD
49 INTRODUCTION
50 1 Scope
2 Normative references
3 Terms and definitions
51 4 Principle
Figure 1 – Relationship between temperature and resistance near the superconducting transition
52 5 Measurement apparatus
5.1 Mandrel or base plate
5.2 Cryostat and support of mandrel or base plate
53 6 Specimen preparation
54 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
56 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
57 9.3 Specimen information
9.4 Test conditions
9.5 RRR value
58 Annex A (informative) Additional information relating to the measurement of RRR
A.1 Considerations for specimens and apparatus
59 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
60 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
61 A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K
A.4.6 AC techniques
62 Annex B (informative) Uncertainty considerations
B.1 Overview
B.2 Definitions
63 B.3 Consideration of the uncertainty concept
Table B.1 – Output signals from two nominally identical extensometers
Table B.2 – Mean values of two output signals
64 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
65 B.4 Uncertainty evaluation example for IEC TC 90 standards
67 Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb superconductors
C.1 Evaluation of uncertainty
C.1.1 Room temperature measurement uncertainty
68 C.1.2 Cryogenic measurement uncertainty
70 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
71 C.2 Inter-laboratory comparison summary
Table C.2 – RRR values obtained by inter-laboratory comparison using liquid helium
72 Bibliography

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BS EN IEC 61788-23:2021 - TC
$217.84