Effect of heat capacity and conductivity of NbTi normal matrix of a composite superconductor on the stability to magnetic flux jumps

The stability against magnetic flux jumps has experimentally been studied in the external magnetic field for three samples from NbTi composite superconductors, one monofilamentary and two multifilamentary. A comparison between the experiment and theory of thermomagnetic stability of composite superc...

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Bibliographic Details
Published in:Technical physics 2017-02, Vol.62 (2), p.237-242
Main Authors: Kruglov, S. L., Shutova, D. I., Shcherbakov, V. I.
Format: Article
Language:English
Subjects:
Analysis
Classical and Continuum Physics
Copper (Metal)
Magnetic fields
Magnetic flux
Magnetism
Niobium base alloys
Physics
Physics and Astronomy
Solid State
Specific heat
Stability
Superconductors
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Summary:The stability against magnetic flux jumps has experimentally been studied in the external magnetic field for three samples from NbTi composite superconductors, one monofilamentary and two multifilamentary. A comparison between the experiment and theory of thermomagnetic stability of composite superconductors has been carried out. We have determined threshold values of the rates of the external magnetic fields, starting from which heat capacity and conductivity of the normal composite matrix become determining stabilizing factors. For the first time, the increasing dependence of field of first magnetic flux jump on the rate of the rise in the external magnetic field has been experimentally registered in the superconducting wire for MRI. The reason for this effect is the shunting effect of a high pure copper matrix and the low volume fraction of a superconductor in the composite (~10%).
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784217020165