Abstract
The optimization process for strand number and diameter, cable void fraction, and Cu/NbTi-ratio of the cable-in-conduit conductor for the superconducting magnet system of the planned stellarator fusion experiment Wendelstein 7-X is presented. Main optimization criteria are stability and cable cooling requirements, taking into account transient disturbances and losses. A simple stability criterion regarding transient disturbances is used which is derived from cable compression experiments. The resulting data for the 16 kA, 6 T cable are: cable and strand diameter /spl ap/11.5 mm and /spl ap/0.57 mm, respectively, strand number /spl ap/250, void /spl ap/36%, and Cu/sc-ratio /spl ap/2.7.
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