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BS EN IEC 61788-22-2:2021 Superconductivity - Normal state resistance and critical current measurement. High-Tc Josephson junction, 2021
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- Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Principle of measurement method
- 6 Apparatus [Go to Page]
- 6.1 General
- 6.2 Cryogenic system
- 6.3 Electrical measurement system
- 6.4 Circuitry
- Figures [Go to Page]
- Figure 1 – Typical circuitry for voltage-current (U–I) characteristic curve measurement
- 7 Estimation of normal state resistance (Rn) and intrinsic critical current (Ici) [Go to Page]
- 7.1 Calculation method
- Figure 2 – Ideal U–I characteristic curve (red line) andhyperbolic function (RSJ) model curve (dotted line)
- 7.2 Geometric mean criterion for hyperbolic function fitting
- 8 Standard uncertainty [Go to Page]
- 8.1 General
- 8.2 Type A uncertainty
- 8.3 Type B uncertainty [Go to Page]
- 8.3.1 General
- 8.3.2 Temperature
- Tables [Go to Page]
- Table 1 – Typical relative standard Type A uncertaintyfor high-Tc Josephson junctions
- Figure 3 – Geometric mean criterion and RSJ model fitting for TUT-JJ05 at 75,8 K [Go to Page]
- 8.3.3 Voltage measurement
- 8.3.4 Current measurement
- Figure 4 – Geometric mean criterion and RSJ model fitting for TUT-JJ05 at 76,3 K
- 8.4 Budget table
- Table 2 – Budget table for Rn
- Table 3 – Budget table for Ici
- 8.5 Uncertainty requirement
- 9 Test report [Go to Page]
- 9.1 Identification of test device
- 9.2 Rn value
- 9.3 Ici value
- 9.4 Standard uncertainty
- 9.5 Atmospheric pressure
- 9.6 Miscellaneous optional report
- Annex A (informative)Calculation technique and practical applicationto high-Tc Josephson junctions [Go to Page]
- A.1 General
- A.2 Hyperbolic function fitting method
- A.3 Geometric mean method
- Figure A.1 – U–I curve based on resistively shunted junction (RSJ) model
- Figure A.2 – U–I curve affected by noise-rounding and self-heating
- A.4 Combined method
- Figure A.3 – Application of geometric mean method to ideal U–I in Figure A.1
- A.5 Estimation of Rn, Ici, uA,R and uA,I [Go to Page]
- A.5.1 General
- A.5.2 High-Tc Josephson junction (JL350)
- Figure A.4 – Application of geometric mean method to U–Iwith noise-rounding and self-heating effects in Figure A.2
- Table A.1 – Rn, Ici, uA,R and uA,I values of high-Tc Josephson junctions
- Figure A.5 – U–I curve of JL350
- Figure A.6 – Application of geometric mean method to Figure A.5 [Go to Page]
- A.5.3 High-Tc Josephson junction (JL351)
- Figure A.7 – Result of RSJ model fitting for JL350
- Figure A.8 – U–I curve of JL351
- Figure A.9 – Application of geometric mean method to Figure A.8 [Go to Page]
- A.5.4 High-Tc Josephson junction (TUT)
- Figure A.10 – Result of RSJ model fitting for JL351
- Figure A.11 – U–I curve of TUT with a small Im
- Figure A.12 – Application of geometric mean method to TUT
- Figure A.13 – Application of adjusted geometrical mean method to TUT
- Figure A.14 – Result of RSJ model fitting for TUT
- Annex B (informative)Practical application to low-Tc Josephson junctions [Go to Page]
- B.1 General
- B.2 Estimation of Rn, Ici, uA,R and uA,I [Go to Page]
- B.2.1 General
- B.2.2 Low-Tc Josephson junction (IU1)
- Table B.1 – Rn, Ici, uA,R and uA,I values of low-Tc Josephson junctions [Go to Page]
- B.2.3 Low-Tc Josephson junction (IU2)
- Figure B.1 – Application of geometric mean method to IU1
- Figure B.2 – Result of RSJ model fitting for IU1 [Go to Page]
- B.2.4 Low-Tc Josephson junction (IU3)
- Figure B.3 – Application of geometric mean method to IU2
- Figure B.4 – Result of RSJ model fitting for IU2
- Figure B.5 – Application of geometric mean method to IU3
- Figure B.6 – Result of RSJ model fitting for IU3 [Go to Page]
- B.2.5 Low-Tc Josephson junction (IU4)
- Figure B.7 – Application of geometric mean method to IU4
- Figure B.8 – Result of RSJ model fitting for IU4
- Bibliography [Go to Page]
