The further developed successor, Wendelstein 7-X, is now to investigate the new stellarator’s suitability for a power plant. It is expected that plasma equilibrium and confinement will be of a quality comparable to that of a tokamak of the same size. But it will avoid the disadvantages of a large current flowing in a tokamak plasma: With plasma discharges lasting up to 30 minutes, Wendelstein 7-X is to demonstrate the essential stellarator property, viz. continuous operation.
Calls for participation in the scientific programme of Wendelstein 7-X will be launched on an annual basis. Scientists in particular from EUROFUSION members but also from international fusion labs will be invited to conduct experiments on Wendelstein 7-X.
Numerically fully optimized current-free stellarator (based on the concept of quasi-isodynamicity). Major radius: 5.5 m, minor radius: 0.53 m 5 periods 70 superconducting magnets 50 modular coils 20 planar Coils Superconductor: NbTi Current density in coil 48 MA/m2 Magnetic field on axis: up to 3.0 T Magnetic Energy: 600 MJ Rotational transform on axis: 0.84 rotational transform at boundary: 0.99 Heating systems: ECRH (140 GHz, 8 MW for 30 min.) NBI (8 MW/10 s)