A5068895165- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- Superconducting Materials and Applications
- Magnetic Field Sensors Techniques
- Interconnection Networks and Systems
- Embedded Systems Design Techniques
- HVDC Systems and Fault Protection
- Parallel Computing and Optimization Techniques
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Solidification and crystal growth phenomena
Shanghai Jiao Tong University
2024
American Superconductor (United States)
1999-2003
American Superconductor (Austria)
2001
General Research Institute for Nonferrous Metals (China)
1989-1990
We have investigated the effect of aspect ratio and current on self-field critical Ag-sheathed Bi-2223 composite tapes. fabricated assemblies monofilament tapes with different capacity. In such a manner, we could study geometry suppression while maintaining quality superconducting filaments constant. find that large is favorable for achieving higher currents which consistent reduction self-field. also used modified configuration several opposing to reduce perpendicular component self field....
Magneto-optical imaging, electromagnetic measurements and SEM have been used for the characterization of a monocore BSCCO tape made by oxide powder-in-tube process which had transport J/sub c/ (77 K, 0 T) 37 kA/cm/sup 2/. Our study evaluates connectivity between superconducting grains reconstructs local current distribution at <10 /spl mu/m scale. Some regions are found to carry up 180 2/ 77 new record wires.
Progress in the performance of multifilamentary composite Bi-2223 wire fabricated at American Superconductor is reviewed. Critical current (I/sub c/) 175 A 77 K and self-field critical density (J/sub 22.1 kA/cm/sup 2/ (77 K, 0.1 T perpendicular to tape plane) have been measured for short samples (standard size 0.21/spl times/4.0/spl times/100 mm). Microstructure analysis by SQUID magnetometry, transmission XRD TEM shows a large amount residual 2212 intergrowth remaining grains. Residual seen...
Accurate measurements of the magnetic AC loss in short samples conductor are essential for design superconducting power devices and guide development wire with low losses. The authors report quantitative at frequencies 77 K obtained a Hall sensor magnetometer (HSM) using calibration method which involves assumptions about current distribution within sample. included strips pure silver multi-filamentary Bi-2223 tapes. A comparison susceptometry their technique shows good agreement between two...
The ac complex susceptibility χ′−iχ″ of several bulk samples with very high critical current density J c have been measured. results show that these are all polycrystalline material, the peak χ″ still related to losses within “the weak link structure” intergrain material. But coupling strength is much stronger than ordinary high-T superconductors. A parameter β=(T c2 (0) −T (h 0 ))/h 2/3 has proposed characterize strength.
Five different phases have been observed in the Bi-Pb-Sr-Ca-Cu-O superconducting compound with T c of 108 K. The high-T and low-T their compositions near ( Bi 0.82 Pb 0.18 ) 4 Sr Ca 3 Cu 6 O y 2 respectively face-centered orthorhombic structure a=0.540 nm , b=0.545 c=3.669 b=0.546 c=3.077 respectively, former has super-structure 3.24 nm, latter 2.7 is incommensurate b-direction. In addition, two kinds minor 0.6 0.4 1.75 0.86 0.14 1 as well CuO also observed.
The study of magnetization irreversibility line a YBaCuO superconductor fabricated by melt-textured growth method with critical temperature T c 89.3 K is presented. sample exhibits obvious anisotropy similar to the behavior single crystal. thermal activation energy an order magnitude larger than that crystal and also polycrystal sample.