THE CHANGE OF COUPLING LOSSES IN ALUMINUM-STABILIZED SUPERCONDUCTORS DUE TO THE HALL-EFFECT

The change of coupling losses in aluminum-stabilized superconductors d ue to the Hall effect is investigated experimentally and numerically. The Hall effect is here taken to be an interaction between the inter-s trand coupling current and the external dc magnetic field. The loss me asurement of the R&D conductor for the helical coil of the Large Helic al Device is carried out under the coexistence of the transverse and t he longitudinal magnetic fields. The measured coupling loss of the rea l conductor induced by the changing transverse magnetic field is incre ased by the existence of the longitudinal dc field. This result shows the reverse dependence of the loss on the longitudinal field to what w as expected by our previous paper. These loss features are compared wi th those by the numerical analysis, on the two dimensional finite elem ent method, of this real conductor with the complex cross-sectional st ructure.