Abstract
Full size conductor short samples for the International Thermonuclear Experimental Reactor (ITER) are composed of two straight conductors connected together at one end, and to the facility current leads at the other ends. The quality of these electrical connections was early suspected to play a role in the measurement of the conductor performance, which has been confirmed by recent test results. In order to investigate this phenomenon, CEA developed an experimental program, within EFDA task ELRES, to study the effect of well calibrated joint defects on subsize NbTi conductor performances. Two types of NbTi strands associated with two different cable void fractions were used in order to vary the interstrand resistances. Experimental results clearly show that joint defects degrade measured conductor critical currents, except when sufficiently low interstrand resistances allow a possible current redistribution among strands. Analysis of Hall probe signals show evidence of current redistribution among subcables during the tests.
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