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New tests have been performed on the 40Ka CEA NB3SN conductor in the Sultan III facility. The aim of these tests is to obtain key experimental data on the behaviour of NB3SN conductors for fusion applications under high field and large transport current. The 40 Ka NB3SN CEA conductor has a shape and an internal arrangement of the superconducting wires which is very similar to the ITER conductors. These tests are therefore of great interest and bring precious information on ITER conductors designs and margins. The level of the ac losses experienced by these conductors under varying fields influences deeply their design. Till now the ac losses were measured without transport current. In this experiment the influence of Lorenz forces on ac losses is investigated at different background fields and with different transport currents. For this, the basic experiment consists in producing field pulses on the conductor by means of a coil installed in the bore of the Sultan magnet and in recording the integrated voltage obtained on pick-up coils placed on the conductor as a function of time. It is possible by this way to evaluate the conductor time constant as a function of the transport current and of the background field.

Additional information

Bibliographic Reference: Article: Fusion Technology (1994), 877-880
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