Title :
Testing of high temperature superconductors for cryogenic current lead applications
Author_Institution :
Westinghouse Sci. & Technol. Center, Pittsburgh, PA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
As part of a developmental effort to bring the technology of high-temperature superconducting current lead to practical applications, device-size high-temperature superconductor (HTSC) samples supplied by various vendor sources were tested. The tests include measurements of DC transport critical current I/sub c/, current density (J/sub c/), and electrical joint resistance (R/sub c/) under externally applied magnetic field in a LN/sub 2/ bath, as well as the effects of thermal cycling on these parameters for one selected sample. Dependence of R/sub c/ on temperature was also evaluated. Based on these tests, a set of HTSC bars was ordered and used in a prototype multiple lead assembly. This lead assembly demonstrated experimentally a two to one reduction in heat leak. The work related to the testing of the HTSC samples is addressed.<>
Keywords :
high-temperature superconductors; low-temperature techniques; wires (electric); DC transport critical current; LN/sub 2/ bath; N/sub 2/; cryogenic current lead applications; current density; electrical joint resistance; externally applied magnetic field; heat leak; high temperature superconductors; multiple lead assembly; thermal cycling; Assembly; Critical current; Cryogenics; Current measurement; Density measurement; Electric variables measurement; Electrical resistance measurement; High temperature superconductors; Testing; Thermal resistance;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
