Limiting Factors for Stable Operating Conditions of 1G and 2G High-TcSuperconducting Current-Carrying Elements in High Magnetic Fields
作者： V.K. Ozhogina , N.A. Lavrov , S. Awaji , V.R. Romanovskii , A.M. Arkharov
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摘要: The limiting currents stably flowing in the current-carrying elements based on 1G and 2G high-temperature superconductors (HTS) are studied. An analysis of stability macroscopic thermal electrical states current charging modes is made terms static zero-dimensional one-dimensional models. For coated tapes YBa 2 Cu 3 0 7 (Y123), investigation was varying thicknesses copper or silver, external magnetic field cooling conditions. performed reveals that instability do not practically depend silver when superconducting element Y123 cooled by cryocooler. At same time, increase thickness stabilizing layer leads to a monotonic stable currents, if liquid helium (LHe) used as coolant. mechanisms these features discussed. It shown induced electric fields depending conditions can be both below (subcritical regime) above (overcritical priori defined critical values superconductor. criteria DC regimes written for wires, which structurally consist multi-filaments placed into non-superconducting matrix. They permit one estimate allowable charged current, overheating superconductor, lead subcritical overcritical regimes. boundary them formulated. In particular, peculiarities Ag-sheathed Bi Sr CaCu O 8 (Bi2212/Ag) wire discussed detail. As result, extends significantly class admissible HTS it proves existence resistive they go normal spite operating take place under different
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