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Reversed field pinch

Reversed-Field Pinch is a toroidal magnetic confinement scheme. It is an alternative to the Tokamak for building a fusion reactor. It has a low-magnetic-field coil but high-fusion-power density.

The name of the configuration is from toroidal component of the magnetic field. Toroidal component's sign in the outer region of the plasma reverses. The largest Reversed Field Pinch device presently in operation is called the Reversed-Field eXperiment.


Comparable magnetic field plasma intensity
- toroidal component
- poloidal component
Internal field

[note: Tokamak's field is toroidal and externally applied.]


Natural plasma
High power density (minimum energy, stable)
Ignition without the need of auxiliary heating
Internal dynamos
Turbulence driven
Established scalings

Magnetic Topology

The Reversed-Field Pinch works towards a state of "minimum energy".

The magnetic field lines coil loosely around a center torus. They coil outwards. Near the plasma edge, the toroidal magnetic field reverses and the field lines coil in the reverse direction.

Internal fields are bigger than the fields at the magnets.


See also: Plasma physics, Nuclear fusion, Stellarator, Tokamak, Magnetic mirror, Magnetohydrodynamics