SIST EN IEC 61788-23:2024

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.
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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.
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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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