期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 56, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6463/aca988
关键词
ultra-high-field; REBCO coated conductor; magnetic-confinement plasma; toroidal field coils
The development of rare-earth barium copper oxide (REBCO) coated conductors with high critical current density has opened up possibilities for large-scale fusion under ultra-high fields. The latest technology, such as cable-in-conduit conductors, has shown outstanding current-carrying capacities. However, the mechanical behavior of the ceramic superconductor is limited when twisted or folded, hindering their potential in ultra-high-field applications. The use of non-twisted cables offers a possible solution by protecting mechanical properties and decreasing the influence of perpendicular fields on critical currents.
The development of rare-earth barium copper oxide (REBCO) coated conductors with an extremely high critical current density under ultra-high fields opens up a high-field path towards large-scale fusion. The latest technology has inspired cable-in-conduit conductors such as conductor on round core wires, twisted stacked tape conductor cables and Rutherford cables with outstanding current-carrying capacities. In order to realise an inductance balance and decrease magnetic diffusion, these cables have been twisted or folded to a certain extent, thus breaking the mechanical behaviour of the ceramic superconductor and limiting their potential for ultra-high-field applications. One possible solution is to employ a non-twisted cable, which offers maximum protection of its mechanical properties and enables a parallel orientation of the toroidal field vector to the surface of REBCO coated conductors, and at the same time decreases the influence of perpendicular fields on the critical current of REBCO cables. However, the applied physics community's attitude towards using non-twisted, parallel REBCO stacked-tape cables is one of scepticism, the main argument being that the nonlinear E-J behaviour associated with screening current in the parallel stack might lead to a field distortion and reduce the performance of superconductivity. Recent analyses have demonstrated that the effect of screening current decreases significantly owing to a wavelike magnetic field distribution along the cable. The authors obtained similar results using H-formulation and T-A formulation based finite element methods and demonstrated that the non-twisted cable may be feasible for DC current transmission toroidal field coils in magnetic-confinement devices. Furthermore, the electromechanical behaviour of toroidal field coils has been evaluated via the Maxwell stress, solved by using an A-V formulation. It was discovered that the stress generated by the toroidal field coils is within the stress tolerance of the REBCO coated conductor, something which is of great significance in promoting the application of REBCO coated conductors for ultra-high-field magnetic-confinement plasma devices.
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