IEC 61788-23:2021
(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 61788-23:2021 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.
Supraconductivité - Partie 23: Mesurage du rapport de résistance résiduelle - Rapport de résistance résiduelle des supraconducteurs de Nb à cavités
L’IEC 61788-23:2021 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.
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IEC 61788-23 ®
Edition 2.0 2021-08
REDLINE VERSION
INTERNATIONAL
STANDARD
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Superconductivity –
Part 23: Residual resistance ratio measurement – Residual resistance ratio
of cavity-grade Nb superconductors
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IEC 61788-23 ®
Edition 2.0 2021-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Superconductivity –
Part 23: Residual resistance ratio measurement – Residual resistance ratio
of cavity-grade Nb superconductors
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220; 29.050 ISBN 978-2-8322-4958-1
– 2 – IEC 61788-23:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 7
4 Principle . 8
5 Measurement apparatus . 9
5.1 Mandrel or base plate . 9
5.2 Cryostat and support of mandrel or base plate . 9
6 Specimen preparation . 10
7 Data acquisition and analysis . 11
7.1 Data acquisition hardware . 11
7.2 Resistance (R ) at room temperature . 11
7.3 Residual resistance (R ) just above the superconducting transition . 11
7.4 Validation of the residual resistance measurement . 13
7.5 Residual resistance ratio . 13
8 Uncertainty of the test method . 13
9 Test report. 13
9.1 General . 13
9.2 Test information . 13
9.3 Specimen information . 14
9.4 Test conditions . 14
9.5 RRR value . 14
Annex A (informative) Additional information relating to the measurement of RRR . 15
A.1 Considerations for specimens and apparatus . 15
A.2 Considerations for specimen mounting orientation . 16
A.3 Alternative methods for increasing temperature of specimen above
superconducting transition temperature . 16
A.3.1 General . 16
A.3.2 Heater method . 16
A.3.3 Controlled methods . 16
A.4 Other test methods . 16
A.4.1 General . 16
A.4.2 Measurement of resistance versus time . 17
A.4.3 Comparison of ice point and room temperature . 17
A.4.4 Extrapolation of the resistance to 4,2 K . 17
A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K . 18
A.4.6 AC techniques . 18
Annex B (informative) Uncertainty considerations . 19
B.1 Overview. 19
B.2 Definitions . 19
B.3 Consideration of the uncertainty concept . 20
B.4 Uncertainty evaluation example for IEC TC 90 standards . 22
Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb
superconductors . 24
C.1 Evaluation of uncertainty . 24
C.1.1 Room temperature measurement uncertainty . 24
C.1.2 Cryogenic measurement uncertainty . 25
C.1.3 Estimation of uncertainty for typical experimental conditions . 27
C.2 Round robin test Inter-laboratory comparison summary . 28
Bibliography . 29
Figure 1 – Relationship between temperature and resistance near the superconducting
transition . 8
Figure A.1 – Determination of the value of R from a resistance versus time plot . 17
Figure C.1 – Graphical description of the uncertainty of regression related to the
measurement of R . 27
Table B.1 – Output signals from two nominally identical extensometers . 20
Table B.2 – Mean values of two output signals . 20
Table B.3 – Experimental standard deviations of two output signals . 21
Table B.4 – Standard uncertainties of two output signals . 21
Table B.5 – Coefficients of variation of two output signals . 21
Table C.1 – Uncertainty of measured parameters . 27
Table C.2 – RRR values obtained by round robin test inter-laboratory
comparison using liquid helium . 28
– 4 – IEC 61788-23:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SUPERCONDUCTIVITY –
Part 23: Residual resistance ratio measurement –
Residual resistance ratio of cavity-grade Nb superconductors
FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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the previous edition IEC 61788-23:2018. A vertical bar appears in the margin wherever a change
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IEC 61788-23 has been prepared by IEC technical committee 90: Superconductivity. It is an
International Standard.
This second edition cancels and replaces the first editio
...
IEC 61788-23 ®
Edition 2.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 23: Residual resistance ratio measurement – Residual resistance ratio
of cavity-grade Nb superconductors
Supraconductivité –
Partie 23: Mesurage du rapport de résistance résiduelle – Rapport de résistance
résiduelle des supraconducteurs de Nb à cavités
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
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variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
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containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
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need further assistance, please contact the Customer Service
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IEC 61788-23 ®
Edition 2.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 23: Residual resistance ratio measurement – Residual resistance ratio
of cavity-grade Nb superconductors
Supraconductivité –
Partie 23: Mesurage du rapport de résistance résiduelle – Rapport de résistance
résiduelle des supraconducteurs de Nb à cavités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220; 29.050 ISBN 978-2-8322-1011-5
– 2 – IEC 61788-23:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 7
4 Principle . 8
5 Measurement apparatus . 9
5.1 Mandrel or base plate . 9
5.2 Cryostat and support of mandrel or base plate . 9
6 Specimen preparation . 10
7 Data acquisition and analysis . 11
7.1 Data acquisition hardware . 11
7.2 Resistance (R ) at room temperature . 11
7.3 Residual resistance (R ) just above the superconducting transition . 11
7.4 Validation of the residual resistance measurement . 13
7.5 Residual resistance ratio . 13
8 Uncertainty of the test method . 13
9 Test report. 13
9.1 General . 13
9.2 Test information . 13
9.3 Specimen information . 14
9.4 Test conditions . 14
9.5 RRR value . 14
Annex A (informative) Additional information relating to the measurement of RRR . 15
A.1 Considerations for specimens and apparatus . 15
A.2 Considerations for specimen mounting orientation . 16
A.3 Alternative methods for increasing temperature of specimen above
superconducting transition temperature . 16
A.3.1 General . 16
A.3.2 Heater method . 16
A.3.3 Controlled methods . 16
A.4 Other test methods . 16
A.4.1 General . 16
A.4.2 Measurement of resistance versus time . 17
A.4.3 Comparison of ice point and room temperature . 17
A.4.4 Extrapolation of the resistance to 4,2 K . 17
A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K . 18
A.4.6 AC techniques . 18
Annex B (informative) Uncertainty considerations . 19
B.1 Overview. 19
B.2 Definitions . 19
B.3 Consideration of the uncertainty concept . 20
B.4 Uncertainty evaluation example for IEC TC 90 standards . 22
Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb
superconductors . 24
C.1 Evaluation of uncertainty . 24
C.1.1 Room temperature measurement uncertainty . 24
C.1.2 Cryogenic measurement uncertainty . 25
C.1.3 Estimation of uncertainty for typical experimental conditions . 27
C.2 Inter-laboratory comparison summary . 28
Bibliography . 29
Figure 1 – Relationship between temperature and resistance near the superconducting
transition . 8
Figure A.1 – Determination of the value of R from a resistance versus time plot . 17
Figure C.1 – Graphical description of the uncertainty of regression related to the
measurement of R . 27
Table B.1 – Output signals from two nominally identical extensometers . 20
Table B.2 – Mean values of two output signals . 20
Table B.3 – Experimental standard deviations of two output signals . 21
Table B.4 – Standard uncertainties of two output signals . 21
Table B.5 – Coefficients of variation of two output signals . 21
Table C.1 – Uncertainty of measured parameters . 27
Table C.2 – RRR values obtained by inter-laboratory comparison using liquid helium . 28
– 4 – IEC 61788-23:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SUPERCONDUCTIVITY –
Part 23: Residual resistance ratio measurement –
Residual resistance ratio of cavity-grade Nb superconductors
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has represen
...
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