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Journal of Superconductivity and Novel Magnetism

, Volume 28, Issue 2, pp 437–442 | Cite as

Measurement of Thermal Expansion of Superconducting Wires at Cryogenic Temperature Based on Tensile Method

  • Canjie XinEmail author
  • Xingzhe Wang
  • Mingzhi Guan
  • Youhe Zhou
Original Paper

Abstract

The effects of variable cryogenic temperature on the thermal expansion are measured by tensile method for several commercial superconducting composite wires of NbTi/Cu, Nb3Sn/Cu, and high-temperature superconducting (HTS) Bi2212/Ag tapes. A variable temperature cryostat system is constructed to provide successive cooling environment from 300 to 77 K, and a cryogenic-type extensometer is utilized to measure the deformation of the superconducting wires arising from tensile and thermal loadings. In comparison with the mechanical deformation at room temperature, the corresponding thermal deformation at the variable cryogenic temperature is recorded and evaluated during stretching of the superconducting wires. The thermal expansion behavior of the composite wires and superconductor filaments is further captured. It shows that the thermal expansion of NbTi/Cu composite wire, NbTi filaments, Nb3Sn/Cu composite wires, and Nb3Sn filaments is almost linearly dependent upon the temperature, while those of HTS Bi2212/Ag tapes exhibit notable nonlinear features during cooling of the superconducting wires. In addition, based on the thermal expansion measured from room temperature to liquid nitrogen temperature, the thermal expansions at 4.2 K are extrapolated for low-temperature composite wires and their filaments, which are compared with the experiments using thermal methods in the existing literature. The results indicate that our variable temperature cryostat system and corresponding tensile method will be an easy way for measuring the thermal parameter of superconducting composite wires.

Keywords

Superconducting composite wire Thermal expansion Cryogenic temperature Tensile method 

Notes

Acknowledgments

The authors would like to acknowledge the supports by the National Natural Science Foundation of China (11302225, 11032006), the Foundation for Innovative Research Groups of NNSFC (11121202), and the National Key Project of Magneto-Constrained Fusion Energy Development Program (2013GB110002).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Canjie Xin
    • 1
    Email author
  • Xingzhe Wang
    • 1
  • Mingzhi Guan
    • 1
    • 2
  • Youhe Zhou
    • 1
  1. 1.Key Laboratory of Mechanics on Environment and Disaster in Western China, The Ministry of Education of China, College of Civil Engineering and MechanicsLanzhou UniversityLanzhouPeople’s Republic of China
  2. 2.Institute of Modern Physics of Chinese Academy of ScienceLanzhouPeople’s Republic of China

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