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Analysis of high-density areas in beryllium hemishells

Description: Small areas of high and low radiographic density in hot-pressed beryllium were studied by macroetching and optical and electron microscopy. The areas were either semispherical or wormlike in shape and were found to be agglomerates of grains markedly coarser or finer than the matrix. (auth)
Date: January 17, 1974
Creator: Lee, O. A. & Riefenberg, D. H.
Partner: UNT Libraries Government Documents Department

Energy losses in mixed matrix superconducting wires under fast pulsed conditions

Description: Energy losses have been measured on a set of mixed matrix (CuNi, Cu, NbTi) superconducting wires at B's up to 1.5 x 10/sup 7/ G/s. The losses have been measured as a function of wire diameter, twist pitch, maximum applied field, and B. Both static and dynamic losses were measured for a field applied perpendicularly to the wire axis. The dynamic losses were measured by slowly applying an external field to a sample and then causing the field to decay exponentially in roughly 1 ms to 10 ms. Under low B (9 kG) and B (10/sup 6/ G/s) conditions the hysteretic loss dominated. At high B (21 kG) and B (1.5 x 10/sup 7/ G/s) the matrix losses became dominant. The systematic variation of the losses with the mentioned parameters will be presented and will be compared to theoretical predictions.
Date: August 17, 1976
Creator: Wollan, J. J.
Partner: UNT Libraries Government Documents Department