What is it about?
Second generation high-temperature superconductor (2G HTS) tapes have demonstrated the ability to generate high magnetic field and critical currents at wide operating temperature range. In this paper we study mechanical properties of 2G HTS tape measured simultaneously with its critical current. The lattice deformations in tape’s substrate caused by applied mechanical stress were measured by neutron diffraction. In our experiments the 2G HTS tape was exposed to uniaxial tensile force ranging 250 N to 1100 N at temperature 77 K. The current through the tape was scanned in the range from 22 A to 42 A. The experimental results have been obtained in cryogenic testing chamber for neutron scattering measurements of internal stresses under load with the incorporated HTS current leads. .
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Why is it important?
The critical stress is vital parameter required for modelling and designing of advanced superconducting magnets and also variety of different superconducting applications based on 2G HTS tapes.
Perspectives
As a further development, we are planning measurements of superconducting critical current, simultaneously with internal stresses in superconducting coil assemblies under mechanical load. In a long term perspective it may lead to development of strain/stress measurement technique applicable to real industrial superconducting magnet coils (MRI, NMR, accelerator magnets) using the tomography-driven neutron diffraction.
Oleg Kirichek
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This page is a summary of: Influence of mechanical stress on electron transport properties of second-generation high-temperature superconducting tapes, Low Temperature Physics, August 2023, American Institute of Physics,
DOI: 10.1063/10.0020169.
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