EXPERIMENTAL INVESTIGATION OF COPPER MATRIX LONGITUDINAL RESISTANCE IN A COMPOSITE NB-TI WIRE

Copper-matrix longitudinal resistance was studied as a function of wir e diameter on specimens of multifilamentary Nb-Ti wire with filaments coated by a Nb layer. Experimental results are compared with the Sondh eimer calculations for a monofilament conductor as well as with the Ga valloni calculations for an ideal wire with hexagonally located filame nts. It has been shown that the best fit with the experiment is provid ed by the Sondheimer approximation. Comparison of the results of this work with other authors' data obtained for the specimens with no niobi um barrier, allows us to single out the influence of a pure size effec t and diffusion of Ti on the resistivity