To evaluate the critical current (Ic) of HTS tape in various temperature conditions, the cryostat with conduction cooling system is widely used with DC power supply. But the continuously increasing DC current affects the temperature rising of metallic parts such as copper terminal for conduction cooling, HTS tape holder, current leads, and contact parts by joule heating. The temperature...
Many investigators have reported the AC loss characteristics in a HTS multi-layered twisted cable. This experimental report describes the whole AC loss characteristics in HTS cable, and the AC loss distribution in each layer of the cable is based on a numerical method only. For this reason, the HTS cable is a twisted structure and a longitudinal magnetic field is generated. A voltage lead...
The Ag-sheathed Bi2223 tapes have been extensively used for practical applications, while it is thought that the Jc properties of the Bi2223 polycrystalline materials were severely limited by the weak grain coupling originated in short coherence length with large anisotropy. Although control of the microstructure is known to be effective to improve critical current properties,...
The superconductors based on magnesium diboride have a lot of advantages in compare with traditional ones, such as relative simplicity of the superconducting compound synthesis process, small weight of finished product, possibility to manufacture superconductors in form of wires and tapes, absence of superconducting properties anisotropy. In this work the results of manufacture and study of...
The continuous advancement of superconductors has empowered numerous industrious, power system, and military utilizations. The performances of MgB2 expand the utilization of superconductors through power transmission, power generation, transportation vehicle, propulsion vessel and several other applications. The proposed higher-level model provides a computationally-efficient tool capable of...
The critical currents of several configurations of MgB2 conductor from “Columbus Superconductors” were characterized under high magnetic field. The measurements were performed at LNCMI Grenoble at a temperature of 4.2 K and a magnetic field ranging from 3 up to 8 T. The characterization of the different configurations takes into account different parameters as filling factor, number of...
Magnesium Diboride (MgB2) superconductors with 11B serving as the boron source, is a potential candidate as an intermediate superconductor in thermo-nuclear fusion reactors having higher neutron flux environment. 11B in elemental form is known to be stable against fast neutron irradiation with significantly lower and reduced radioactive properties. Scientific Research Council of Department of...
We report that the strong flux pinning of (Ba, K)Fe2As2 thin films is induced by the superconducting phase distribution characteristics. Depending on the growth conditions, our thin films have distribution diversity which can induce various superconducting properties. The activation energy is one of the parameters representing pinning forces. We compare the activation energy of two different...
Reinforced round and rectangular, Bi2212 -based, high temperature superconducting wires are being developed for use in transposed cables, coils and magnets that are problematic with wide HTS tapes, and that need to operate beyond the limits of low temperature superconductors. These wires exhibit in excess of 500 MPa stress tolerances and current densities (Jc’s) that exceed 2000 A/mm2 at >...
The uniaxial strain induced the critical current degradation of Bi-2212 Ag-sheathed round wire was studied at 4.2 K in 14 T background field. The strains applied on the sample are both tension and compression. An additional tensile strain caused by the difference of thermal expansion between Bi-2212 round wire and Ti-6Al-4V was calculated. Results show that a drastic degradation of the...
