Resonant magnetic perturbations (RMPs) are a special type of magnetic field perturbations used to control burning plasma instabilities called edge-localized modes (ELMs) in magnetic fusion devices such as tokamaks.
The efficiency of RMPs for controlling ELMs was first demonstrated on the tokamak DIII-D in 2003.
[1] Normally the rippled magnetic field will only suppress ELMs for very narrow ranges of the plasma current.
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