resonant magnetic perturbations
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.
{{cite journal
|author=T.E. Evans
|display-authors=etal
|date=2004
|title=Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
|journal=Physical Review Letters
|volume=92 |issue=23
|pages=235003
|doi=10.1103/PhysRevLett.92.235003
|bibcode = 2004PhRvL..92w5003E
|pmid=15245164|url=https://digital.library.unt.edu/ark:/67531/metadc786376/m2/1/high_res_d/821820.pdf
}}
Normally the rippled magnetic field will only suppress ELMs for very narrow ranges of the plasma current.[https://scitechdaily.com/fusion-power-breakthrough-new-method-for-eliminating-damaging-heat-bursts-in-toroidal-tokamaks/ Fusion Power Breakthrough: New Method for Eliminating Damaging Heat Bursts in Toroidal Tokamaks]
See also
- Plasma instability
- COMPASS tokamak
- NSTX-U, also uses RMPs to control ELMs
References
{{Reflist}}
Further reading
- [https://arxiv.org/ftp/arxiv/papers/1303/1303.0146.pdf Effect of resonant magnetic perturbations on ELMs in connected double null plasmas in MAST]
- [https://iopscience.iop.org/article/10.1088/0029-5515/48/2/024002/meta RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities 2008], RMP for ITER-like plasma triangularity is harder
- [https://www.osti.gov/servlets/purl/1265646 Connection between plasma response and RMP ELM suppression in DIII-D Wingen 2015] free access
- [https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.045001 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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