QUANTIFICATION OF PINNING CENTER THICKNESS IN CONVENTIONALLY PROCESSED AND POWDER PROCESSED ARTIFICIAL PINNING CENTER MICROSTRUCTURES

The quantity, size and distribution of pinning centers are key factors in determining the J(c) of Nb-Ti-based superconductors. In Artificial Pinning Center, APC composites large strains must be applied between the assembly of the pinning structure and the final strand, which can result in large changes and variations in pinning center size and shap e, In order to correctly interrupt the properties of artificial pinnin g structures, we need an accurate description of their geometry, In th is paper we discuss the various techniques available for quantifying n ear optimum size microstructures and compare the results, We also cont rast the distributions found in APC style microstructures with those p roduced by conventional processing.