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Investigation of losses to magnetization in a superconducting helicoid

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Abstract

Energy losses to magnetization (hysteretetic losses) in a superconducting helicoid consisting of a flat-turn winding have been investigated. Each flat turn of the helicoid contained 15 parallel composite superconductors. The current-voltage characteristic of the helicoid was obtained by measuring the losses in the steady-state regime with a fixed transport current. The measurements of the losses in a dynamic regime made it possible to obtain a realistic estimate of the heat-transfer coefficient in liquid helium—an important thermophysical characteristic of the theory of the dynamic stability of superconductors. Comparing the losses in the helicoid with the losses in an individual constituent superconductor made it possible to determine the “size scale” of the helicoid as a superconducting composite structure. An expression for the losses to magnetization that describes the experimental results well is obtained in a geometric approximation of the helicoid by an infinite, isotropic, hollow cylinder with an azimuthal transport current.

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Authors and Affiliations

  1. Russian Science Center “Kurchatov Institute”, 123182, Moscow, Russia

    S. L. Kruglov

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  1. S. L. Kruglov
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Zh. Tekh. Fiz. 67, 110–114 (February 1997)

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Kruglov, S.L. Investigation of losses to magnetization in a superconducting helicoid. Tech. Phys. 42, 220–224 (1997). https://doi.org/10.1134/1.1258627

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  • DOI: https://doi.org/10.1134/1.1258627

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