Resonant magnetic perturbations

Short description: Non-axisymmetric magnetic fields used to control tokamak edge instabilities

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

## References

1. ↑ T.E. Evans (2004). "Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary". Physical Review Letters 92 (23). doi:10.1103/PhysRevLett.92.235003. PMID 15245164. Bibcode: 2004PhRvL..92w5003E. https://digital.library.unt.edu/ark:/67531/metadc786376/m2/1/high_res_d/821820.pdf.
2. ↑ Fusion Power Breakthrough: New Method for Eliminating Damaging Heat Bursts in Toroidal Tokamaks

## Further reading

* Kirk, A. et al. (2013). "Effect of resonant magnetic perturbations on ELMs in connected double null plasmas in MAST". Plasma Physics and Controlled Fusion 55 (4). doi:10.1088/0741-3335/55/4/045007. Bibcode: 2013PPCF...55d5007K.
* Evans, T. E. (2008). "RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities". Nuclear Fusion 48 (2). doi:10.1088/0029-5515/48/2/024002. Bibcode: 2008NucFu..48b4002E. https://iopscience.iop.org/article/10.1088/0029-5515/48/2/024002RMP 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."

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