29.050 – Superconductivity and conducting materials – PDF Standards Store

JIS K 7194:1994

Wed, 06 Nov 2024 02:38:42 +0000

Testing Method for Resistivity of Conductive Plastics with a Four-Point Probe Array

Published By	Publication Date	Number of Pages
JIS	1994-12-01	21

JIS H 7307:2010

Wed, 06 Nov 2024 02:26:34 +0000

This Standard describes measurement of the surface resistance of superconductors at microwave frequencies by the standard two-resonator method.

The object of measurement is the temperature dependence of Rs at the resonant frequency.

The applicable measurement range of surface resistances for this method is as follows:

— Frequency: 8 GHz less than f less than 30 GHz

— Measurement resolution: 0.01 mO at 10 GHz

The surface resistance data at the measured frequency, and that scaled to 10 GHz, assuming the f2 rule for comparison, are reported.

NOTE: The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows:

lEC 61788-7: 2006 Superconductivity-Part 7: Electronic characteristic measurements-Surface resistance of superconductors at microwave frequencies (IDT)

The symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.

JIS H 7305:2010

Wed, 06 Nov 2024 02:26:34 +0000

This Standard covers a test method for the determination of the dc critical current of short and straight Ag- and/or Ag alloy-sheathed Bi-2212 and Bi-2223 oxide superconductors that have a monolithic structure and a shape of round wire or flat or square tape containing mono- or multicores of oxides.

This method is intended for use with superconductors that have critical currents less than 500 A and n-values larger than 5.

The test is carried out with and without an applying external magnetic field.

For all tests in a magnetic field, the magnetic field is perpendicular to the length of the specimen.

In the test of a tape specimen in a magnetic field, the magnetic field is parallel or perpendicular to the wider tape surface (or one surface if square).

The test specimen is immersed either in a liquid helium bath or a liquid nitrogen bath during testing.

Deviations from this test method that are allowed for routine tests and other specific restrictions are given in this Standard.

NOTE: The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows:

lEC 61788-3: 2006 Superconductivity-Part 3: Critical current measurement- DC critical current of Ag- and / or Ag alloy-sheathed Bi-2212 and Bi-2223 oxide superconductors (IDT)

JIS H 7005:2005

Wed, 06 Nov 2024 02:26:23 +0000

International Electrotechnical Vocabulary - Part 815: Superconductivity

Published By	Publication Date	Number of Pages
JIS	2005-03-20	67

JIS C 3001:1981

Wed, 06 Nov 2024 01:59:42 +0000

Resistance of Copper Materials for Electrical Purposes

Published By	Publication Date	Number of Pages
JIS	1981-03-01	6

JIS C 2527:1994

Wed, 06 Nov 2024 01:59:10 +0000

Testing method for thermo-electromotive force of metallic resistance materials

Published By	Publication Date	Number of Pages
JIS	1994-03-01	8

JIS C 2526:1994

Wed, 06 Nov 2024 01:59:10 +0000

Testing method for electrical resistance-temperature characteristics of metallic resistance materials

Published By	Publication Date	Number of Pages
JIS	1994-03-01	12

JIS C 2525:1999

Wed, 06 Nov 2024 01:59:09 +0000

Testing method for conductor-resistance and resistivity of metallic resistance materials

Published By	Publication Date	Number of Pages
JIS	1999-07-20	12

IEC TR 61788-20:2014

Tue, 05 Nov 2024 20:03:11 +0000

IEC TR 61788:2014 which is a technical report, provides general characteristics and guidance on practical superconducting (SC) wires. Particular focus is given to the characteristics that are different from those of ordinary copper and aluminium wires, since practical SC wires have appearance nearly identical to common electrical wires and can be used interchangeably with them. On the other hand, the practical SC wires are typically composite materials consisting of several functional materials. Many forms of SC wires are described in Section 4 of IEC 60050-815, including single core wires, multi-filamentary superconducting wires, composite superconductors and coated conductors. These wires as well as others that might be described as monolithic composite superconducting wires will be the focus in this technical report. A wire is considered as being practical if it can be procured in sufficiently continuous lengths under ordinary commercial transactions to build devices. Conductors made of multiple wires, such as cables, for example, are not included in this scope. Since this report only addresses the characteristics of practical wires, other wires such as prototype, test sample and developmental wires are not included in the scope of this technical report.

Key words: superconductivity, supraconductivité

IEC 61788-8:2010

Tue, 05 Nov 2024 19:32:50 +0000

IEC 61788-8:2010 specifies the measurement method of total AC losses by the pickup coil method in composite superconducting wires exposed to a transverse alternating magnetic field. The losses may contain hysteresis, coupling and eddy current losses. The standard method to measure only the hysteresis loss in DC or low-sweep-rate magnetic field is specified in IEC 61788-13. In metallic and oxide round superconducting wires expected to be mainly used for pulsed coil and AC coil applications, AC loss is generated by the application of time-varying magnetic field and/or current. The contribution of the magnetic field to the AC loss is predominant in usual electromagnetic configurations of the coil applications. For the superconducting wires exposed to a transverse alternating magnetic field, the present method can be generally used in measurements of the total AC loss in a wide range of frequency up to the commercial level, 50/60 Hz, at liquid helium temperature. For the superconducting wires with fine filaments, the AC loss measured with the present method can be divided into the hysteresis loss in the individual filaments, the coupling loss among the filaments and the eddy current loss in the normal conducting parts. In cases where the wires do not have a thick outer normal conducting sheath, the main components are the hysteresis loss and the coupling loss by estimating the former part as an extrapolated level of the AC loss per cycle to zero frequency in the region of lower frequency, where the coupling loss per cycle is proportional to the frequency. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below:
– extending the applications of the pickup coil method to the a.c. loss measurements in metallic and oxide superconducting wires with a round cross section at liquid helium temperature,
– using the word "uncertainty" for all quantitative (associated with a number) statistical expressions and eliminating the quantitative use of "precision" and "accuracy".
Key words: superconductivity, TC90