W7-X
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: | 253 | |
| 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
- Feasible modular coils
- Good, nested magnetic surfaces
- Good finite-β equilibria
- Good MHD stability
- Small neoclassical transport
- Small bootstrap current
- Good confinement of fast particles
See also
- Wendelstein 7-X (division)
- Wendelstein 7-X (project)