Resonant Magnetic Perturbation

A Resonant Magnetic Perturbation (RMP) is an externally-induced small perturbation of the equilibrium magnetic field, such that it is resonant with the field at a given magnetic flux surface, usually located in the plasma edge region. Resonance means that the perturbation has the same helicity as the equilibrium magnetic field at the target flux surface. The perturbation typically leads to the ergodization of the magnetic field around the resonant flux surface.

The goal is to stabilize a specific instability, mainly Edge Localized Modes.