Solution for Lorentz Forces Response and Degradation in ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Cable in Conduit Conductors; Verification of Cabling Effect

We present the latest results of our novel model for transverse electro-magnetic load optimization (TEMLOP). The most essential and innovative feature of the TEMLOP, a priori prediction done in May 2006, is that the severe degradation in CICCs for the International Thermonuclear Experimental Reactor (ITER) can be outstandingly improved by increasing the pitch length in subsequent cabling stages and by reducing the void fraction. The model directly uses data describing the behavior of single strands under uni-axial stress and strain, periodic bending and contact loads, avoiding uncertainties in interpretation of the strand internal stress strain distribution. A full-size European Union prototype TF (TFPRO-2/OST-II) conductor was adapted according this new insight and tested in SULTAN for experimental validation of the prediction. The results were outstanding. For the first time a Nb₃Sn CICC conductor achieved the maximum possible performance in relation to the strand properties, with even similar n -value, no degradation and no sensitivity to transverse load at all.