BS EN IEC 61788-17:2021

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Superconductivity – Electronic characteristic measurements. Local critical current density and its distribution in large-area superconducting films

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BSI	2021	48

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Categories: 91.140.50 - Electricity supply systems, BSI

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Description

IEC 61788-17:2021 is available as IEC 61788-17:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61788-17:2021 specifies the measurements of the local critical current density (Jc) and its distribution in large-area high-temperature superconducting (HTS) films by an inductive method using third-harmonic voltages. The most important consideration for precise measurements is to determine Jc at liquid nitrogen temperatures by an electric-field criterion and obtain current-voltage characteristics from its frequency dependence. Although it is possible to measure Jc in applied DC magnetic fields [20] [21], the scope of this document is limited to the measurement without DC magnetic fields. This technique intrinsically measures the critical sheet current that is the product of Jc and the film thickness d. The range and measurement resolution for Jcd of HTS films are as follows. – Jcd: from 200 A/m to 32 kA/m (based on results, not limitation). – Measurement resolution: 100 A/m (based on results, not limitation).

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PDF Pages	PDF Title
2	undefined
5	Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7	CONTENTS
9	FOREWORD
11	INTRODUCTION
13	1 Scope 2 Normative references 3 Terms and definitions
14	4 Requirements
15	5 Apparatus 5.1 Measurement equipment Figures Figure 1 – Diagram for an electric circuit usedfor inductive Jc measurement of HTS films
16	5.2 Components for inductive measurements Figure 2 – Illustration showing techniques to press the sample coil to HTS films
17	6 Measurement procedure 6.1 General 6.2 Determination of the experimental coil coefficient Figure 3 – Example of a calibration wafer used to determine the coil coefficient
18	Figure 4 – Illustration of the sample coil and the magnetic field during measurement
19	Figure 5 – Illustration of the sample coil and its magnetic field generation Tables Table 1 – Specifications and theoretical coil coefficients k of sample coils
21	6.3 Measurement of Jc in sample films 6.4 Measurement of Jc with only one frequency Figure 6 – E-J characteristics measured by a transport methodand the U3 inductive method
22	6.5 Examples of the theoretical and experimental coil coefficients Figure 7 – Illustration of coils 1 and 3 in Table 2 Table 2 – Specifications and coil coefficients of typical sample coils
23	7 Uncertainty in the test method 7.1 Major sources of systematic effects that affect the U3 measurement Figure 8 – The coil-factor function F(r) = 2H0/I0 calculated for the three coils
24	7.2 Effect of deviation from the prescribed value in the coil-to-film distance Figure 9 – The coil-to-film distance Z1 dependenceof the theoretical coil coefficient k
25	7.3 Uncertainty in the experimental coil coefficient and the obtained Jc 7.4 Effects of the film edge 7.5 Specimen protection
26	8 Test report 8.1 Identification of test specimen 8.2 Report of Jc values 8.3 Report of test conditions
27	Annex A (informative) Additional information relating to Clauses 1 to 8
29	Figure A.1 – Illustration of the sample coil andthe magnetic field during measurement
31	Figure A.2 – U3 and U3/I0 plotted against I0 in a YBCO thin film measured in applied DC magnetic fields, and the scaling observed when normalized by Ith (insets) Figure A.3 – Example of the normalized third-harmonicvoltages (U3/fI0) measured with various frequencies
33	Annex B (informative) Optional measurement systems
34	Figure B.1 – Schematic diagram for the variable-RL-cancel circuit Figure B.2 – Diagram for an electrical circuit used for the two-coil method
35	Figure B.3 – Harmonic noises arising from the power source Figure B.4 – Noise reduction using a cancel coil with a superconducting film
36	Figure B.5 – Normalized harmonic noises (U3/fI0) arising from the power source Figure B.6 – Normalized noise voltages after the reductionusing a cancel coil with a superconducting film
37	Figure B.7 – Normalized noise voltages after the reductionusing a cancel coil without a superconducting film Figure B.8 – Normalized noise voltages with the two-coil system shown in Figure B.2
38	Annex C (informative) Evaluation of the uncertainty
39	Table C.1 – Uncertainty budget table for the experimental coil coefficient k′
41	Table C.2 – Examples of repeated measurements of Jc and n-values
43	Figure C.1 – Effect of the coil position against a superconductingthin film on the measured Jc values
44	Bibliography

Additional information

Status	Definitive
Pages	48
Publication Date	2021-06-16
ISBN	978 0 539 03980 1
Standard Number	BS EN IEC 61788-17:2021
Title	Superconductivity – Electronic characteristic measurements. Local critical current density and its distribution in large-area superconducting films
Identical National Standard Of	EN 61788-17 Ed.2.0, IEC 61788-17 Ed.2.0
Replaces	BS EN 61788-17:2013
Descriptors	Data transmission methods, Transport layer (OSI), Open systems interconnection, Interfaces (data processing), Data transfer, Electricity supply meters, Electrical equipment, Test equipment, Copper, Reports, Current measurement, Superconductors, Electric current, Electrical conductivity, Electrical resistivity, Direct current, Reliability, Electrical properties of materials, Titanium, Electric fields, Testing conditions, Error correction, Composite materials, Specimen preparation, Superconductivity, Niobium, Magnetic field effects, Mathematical calculations
Publisher	BSI
Committee	W/-
ICS Codes	91.140.50 - Electricity supply systems

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