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W7-X model

Wendelstein 7-X (W7-X) is an experimental stellarator currently being built in Greifswald, Germany by the Max-Planck-Institut für Plasmaphysik (IPP). W7-X is an optimized stellarator, i.e. the magnetic field has been tailored to meet several physical optimization criteria.

Parameter Value Unit
Major radius, R0: 5.5 m
Minor radius, a: 0.53 m
Plasma volume, V: 30 m3
Non-planar coils: 50
Planar coils: 20
Number of ports: 254
Rotational transform, ι/2π: 5/6-5/4
Magnetic field on axis, B0: <3 T
Stored energy, W: 600 MJ
Heating power, P: 15-30 MW
Pulse length: 30 min
Machine height: 4.5 m
Machine diameter: 16 m
Machine mass: 725 t

Optimization criteria

See also