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GB/T 21227-2021AC loss measurements - Magnetometer methods for hysteresis loss in superconducting multifilamentary composites (English PDF)

交流损耗测量多丝复合超导材料磁滞损耗的磁强计测量法

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

May 21, 2021

Implementation date

December 1, 2021

Scope

GB/T 21227-2021 is the English-translated version of 交流损耗测量多丝复合超导材料磁滞损耗的磁强计测量法.

GB/T 21227-2021 is the Chinese standard "AC loss measurements - Magnetometer methods for hysteresis loss in superconducting multifilamentary composites". Its scope clause reads: This document describes the use of DC or low-sweep field rate magnetometer methods to measure the hysteresis loss of Cu/Nb-Ti multifilament composites. should.

This document specifies a method for measuring hysteresis loss in Cu/Nb-Ti multi-filament composite conductors. Measured at a temperature of 4.2K or close Performed on 4.2K circular cross-section superconducting wire.

The DC or low-sweep field rate magnetometer method uses a superconducting quantum interference device (SQUID) Magnetometer (see Appendix A) or Vibrating Sample Magnetometer (VSM).

If it is found in the measurement that a different (but all calibrated) magnetometer is used If there is a difference between the results, the VSM measurement results extrapolated to zero sweep field rate shall prevail.

Extend this measurement method to general superconductors The specifications are detailed in Appendix B. Its clauses include terms and definitions.

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Document preview — GB/T 21227-2021

National Standard of the People's Republic of China

Classification: H 21

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Target uncertainty
4.2 Uncertainty and uniformity of applied magnetic field
4.3 Calibration of VSM
4.4 Temperature
4.5 Sample length
4.6 Sample orientation and demagnetization effect
4.7 Normalized volume
4.8 Magnetic field circulation or scanning mode
5 VSM measurement method
5.1 General
5.2 VSM measurement principle
5.3 VSM sample preparation
5.4 VSM measurement conditions and calibration
6 Test report
6.1 General
6.2 Basic information about the test
6.3 Technical details
Appendix A (informative) SQUID measurement method
Appendix B (Normative) This method is extended to the measurement of general superconductors
Appendix C (informative) Uncertainty considerations

1 Scope

This document describes the use of DC or low-sweep field rate magnetometer methods to measure the hysteresis loss of Cu/Nb-Ti multifilament composites.

should. This document specifies a method for measuring hysteresis loss in Cu/Nb-Ti multi-filament composite conductors. Measured at a temperature of 4.2K or close

Performed on 4.2K circular cross-section superconducting wire. The DC or low-sweep field rate magnetometer method uses a superconducting quantum interference device (SQUID)

Magnetometer (see Appendix A) or Vibrating Sample Magnetometer (VSM). If it is found in the measurement that a different (but all calibrated) magnetometer is used

If there is a difference between the results, the VSM measurement results extrapolated to zero sweep field rate shall prevail. Extend this measurement method to general superconductors

The specifications are detailed in Appendix B.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

IEC 60050 (all parts) International electrotechnical vocabulary (see \u003chttp.//

IEC 61788-5 Superconductivity Part 5.Measurement of the volume ratio of substrate to superconductor Copper-niobium-titanium (Cu/Nb-Ti) composite superconducting wire

Copper-superconductor volume ratio measurement (Superconductivity-Part 5.Matrix to superconductor volume ratio measurement-CoppertosuperconductorvolumeratioofCu/Nb-Ticompositesuperconductors)

3 Terms and definitions

The following terms and definitions defined by IEC 60050-815 apply to this document.

3.1 AC loss

The power lost in the composite superconductor due to the time-varying magnetic field or current.

Note. The AC loss in each magnetic field (change) period is marked as Q. Although in general, all such losses inevitably have "hysteresis", but complex

The AC loss in superconducting materials can usually be divided into hysteresis loss, eddy current loss and coupling loss (see IEC 60050-815.2015 815-13-52

Note 1 and Note 2), respectively, are defined as follows.

[Source. IEC 60050-815.2015, 815-13-52, with modification]

3.2 Hysteresis loss

A loss of superconductor in a changing magnetic field, its value is proportional to the frequency of the alternating magnetic field.

Note 1.The hysteresis loss is caused by the irreversible magnetism of the superconducting material caused by magnetic flux pinning.

Note 2.Hysteresis loss only occurs in the superconducting region of the Cu/Nb-Ti composite material, so there will be hysteresis loss even if there is no matrix material. each

GB/T 20831 | GB/T 23365 | GB/T 24488 | GB/T 43894.2 | GB/T 13221 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 30 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60050 · IEC 61788

Cited by

GB/T 38842-2020Categories and test methods of practical superconducting wires - General characteristics and guidance

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