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.[2]
See also
Plasma instability
COMPASS tokamak
NSTX-U, also uses RMPs to control ELMs
References
T.E. Evans; et al. (2004). "Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary" (Submitted manuscript). Physical Review Letters. 92 (23): 235003. Bibcode:2004PhRvL..92w5003E. doi:10.1103/PhysRevLett.92.235003. PMID 15245164.
Fusion Power Breakthrough: New Method for Eliminating Damaging Heat Bursts in Toroidal Tokamaks
Further reading
Effect of resonant magnetic perturbations on ELMs in connected double null plasmas in MAST
RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities 2008, RMP for ITER-like plasma triangularity is harder
Connection between plasma response and RMP ELM suppression in DIII-D Wingen 2015 free access
Wide Operational Windows of Edge-Localized Mode Suppression by Resonant Magnetic Perturbations in the DIII-D Tokamak 2020 "The model predicts that wide q95 windows of ELM suppression can be achieved at substantially higher pedestal pressure in DIII-D by shifting to higher toroidal mode number (n=4) RMPs."
Hellenica World - Scientific Library
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