Speaker
Description
Many superconducting devices require higher currents which leads to the request for cables assembling single wires or tapes. MgB2 cables were developed with different geometries: twisted and braided cables, Roebel and Rutherford style geometries. MgB2 cables allow to make winding with small diameters without current degradation and reduce the AC losses through the lowered coupling loss. The most attractive version is the Rutherford cable which gives opportunity for very complex structures, the use of mono- or multicore wires and the mixture of strands with stabilizing Cu and reinforcing stainless steel wires to address all possible application requests. To reduce AC losses in transposed cables is more effective then use of twisted filamentary MgB2 wires with reduced current currying capacity. For cabling purposes, PIT in situ and IMD MgB2 wires are the best candidates to realize a transposition of strands, allowing hard bending before reaction treatment without damage. Engineering current densities, strain tolerances and AC losses of MgB2 cables with different compositions and manufactured by PIT and IMD process are presented, compared and discussed. Balancing the final properties of a cable to an optimum is still a challenge and requires more work in particular the application for specific requirements (e.g. for wind generators), which determine the detailed cable design and preparation approach.
| Submitters Country | Slovakia |
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