EN IEC 61788-23:2024
(Main)Superconductivity - Part 23: Residual resistance ratio measurement - Residual resistance ratio of cavity-grade Nb superconductors
Superconductivity - Part 23: Residual resistance ratio measurement - Residual resistance ratio of cavity-grade Nb superconductors
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.
Supraleitfähigkeit - Teil 23: Messung des Restwiderstandsverhältnisses - Restwiderstandsverhältnis von hochreinen Nb-Supraleitern für Kavitäten
Supraconductivité - Partie 23: Mesurage du rapport de résistance résiduelle - Rapport de résistance résiduelle des supraconducteurs de Nb à cavités
IEC 61788-23:2024 est disponible sous forme de IEC 61788-23:2024 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61788-23:2024 spécifie une méthode d'essai pour la détermination du rapport de résistance résiduelle (RRR), rRRR, du niobium à cavités. Cette méthode est destinée aux nuances de niobium de grande pureté de 150 < rRRR < 600. La méthode d'essai est valide pour des éprouvettes à sections rectangulaires ou circulaires, de surface de section supérieure à 1 mm2, mais inférieure à 20 mm2, et dont la longueur n'est pas inférieure à 10 fois ni supérieure à 25 fois la largeur ou le diamètre.
Superprevodnost - 23. del: Meritve deleža preostale upornosti - Delež preostale upornosti niobijskih superprevodnikov
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 61788-23:2023
01-september-2023
Superprevodnost - 23. del: Meritve deleža preostale upornosti - Delež preostale
upornosti niobijskih superprevodnikov
Superconductivity - Part 23: Residual resistance ratio measurement - Residual
resistance ratio of cavity-grade Nb superconductors
Supraleitfähigkeit - Teil 23: Messung des Restwiderstandsverhältnisses -
Restwiderstandsverhältnis von hochreinen Nb-Supraleitern für Kavitäten
Supraconductivité - Partie 23: Mesurage du rapport de résistance résiduelle - Rapport de
résistance résiduelle des supraconducteurs de Nb à cavités
Ta slovenski standard je istoveten z: prEN IEC 61788-23:2023
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
oSIST prEN IEC 61788-23:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN IEC 61788-23:2023
oSIST prEN IEC 61788-23:2023
90/503/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61788-23 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-06-09 2023-09-01
SUPERSEDES DOCUMENTS:
90/499/RR
IEC TC 90 : SUPERCONDUCTIVITY
SECRETARIAT: SECRETARY:
Japan Mr Jun Fujikami
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
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Recipients of this document are invited to submit, with their comments, notification of any relevant “In So me Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Superconductivity - Part 23: Residual resistance ratio measurement - Residual resistance ratio of
cavity-grade Nb superconductors
PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
oSIST prEN IEC 61788-23:2023
90/503/CDV – 2 – IEC 61788-23:2022 © IEC 2023
1 CONTENTS
2 FOREWORD . 4
3 INTRODUCTION . 6
4 1 Scope . 7
5 2 Normative references . 7
6 3 Terms and definitions . 7
7 4 Principle . 8
8 5 Measurement apparatus . 9
9 5.1 Mandrel or base plate . 9
10 5.2 Cryostat and support of mandrel or base plate . 9
11 6 Specimen preparation . 10
12 7 Data acquisition and analysis . 11
13 7.1 Data acquisition hardware . 11
14 7.2 Resistance (R ) at room temperature . 11
15 7.3 Residual resistance (R ) just above the superconducting transition . 11
16 7.4 Validation of the residual resistance measurement . 13
17 7.5 Residual resistance ratio . 13
18 8 Uncertainty of the test method . 13
19 9 Test report . 13
20 9.1 General . 13
21 9.2 Test information . 13
22 9.3 Specimen information . 14
23 9.4 Test conditions . 14
24 9.5 RRR value . 14
25 Annex A (informative) Additional information relating to the measurement of RRR . 15
26 A.1 Considerations for specimens and apparatus . 15
27 A.2 Considerations for specimen mounting orientation . 16
28 A.3 Alternative methods for increasing temperature of specimen above
29 superconducting transition temperature . 16
30 A.3.1 General . 16
31 A.3.2 Heater method . 16
32 A.3.3 Controlled methods. 16
33 A.4 Other test methods . 16
34 A.4.1 General . 16
35 A.4.2 Measurement of resistance versus time . 17
36 A.4.3 Comparison of ice point and room temperature . 17
37 A.4.4 Extrapolation of the resistance to 4,2 K . 17
38 A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K . 18
39 A.4.6 AC techniques . 18
40 Annex B (informative) Uncertainty considerations . 19
41 B.1 Overview. 19
42 B.2 Definitions. 19
43 B.3 Consideration of the uncertainty concept . 20
44 B.4 Uncertainty evaluation example for IEC TC 90 standards . 22
45 Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb
46 superconductors . 24
oSIST prEN IEC 61788-23:2023
IEC 61788-23:2022 © IEC 2023 – 3 – 90/503/CDV
47 C.1 Evaluation of uncertainty . 24
48 C.1.1 Room temperature measurement uncertainty . 24
49 C.1.2 Cryogenic measurement uncertainty . 25
50 C.1.3 Estimation of uncertainty for typical experimental conditions . 27
51 C.2 Inter-laboratory comparison summary . 28
52 Bibliography . 29
54 Figure 1 – Relationship between temperature and resistance near the superconducting
55 transition . 8
56 Figure A.1 – Determination of the value of R from a resistance versus time plot . 17
57 Figure C.1 – Graphical description of the uncertainty of regression related to the
58 measurement of R . 27
60 Table B.1 – Output signals from two nominally identical extensometers . 20
61 Table B.2 – Mean values of two output signals . 20
62 Table B.3 – Experimental standard deviations of two output signals . 21
63 Table B.4 – Standard uncertainties of two output signals . 21
64 Table B.5 – Coefficients of variation of two output signals . 21
65 Table C.1 – Uncertainty of measured parameters . 27
66 Table C.2 – RRR values obtained by inter-laboratory comparison using liquid helium . 28
oSIST prEN IEC 61788-23:2023
90/503/CDV – 4 – IEC 61788-23:2022 © IEC 2023
69 INTERNATIONAL ELECTROTECHNICAL COMMISSION
70 ____________
72 SUPERCONDUCTIVITY –
74 Part 23: Residual resistance ratio measurement –
75 Residual resistance ratio of cavity-grade Nb superconductors
77 FOREWORD
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111 International Standard.
112 This second edition cancels and replaces the first edition published in 2018. This edition
113 constitutes a technic
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