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Resonant Magnetic Perturbation: Difference between revisions
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A Resonant Magnetic Perturbation (RMP) is an externally-induced small perturbation of the [[MHD equilibrium|equilibrium]] magnetic field, | |||
such that it is resonant with the field at a given magnetic [[flux surface]], | |||
that | usually located in the plasma edge region. | ||
Resonance means that the perturbation has the same [[Rotational transform|helicity]] as the equilibrium magnetic field at the target flux surface. | |||
The perturbation is assumed to lead to the ergodization of the magnetic field around the resonant flux surface. | |||
The goal is to stabilize a specific instability, mainly [[Edge Localized Modes]] (ELMs), in order to reduce the deleterious effects of the corresponding transport bursts on the wall of the device. | |||
<ref>[[doi:10.1038/nphys312|T.E. Evans, et al, ''Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas'', Nature Physics '''2''' (2006) 419 - 423]]</ref> | |||
Resonance of the externally imposed field with the field line pitch is assumed to be essential for the generation of a stochastic zone and the desired mitigating effect on the instability. | |||
<ref>[[doi:10.1103/PhysRevLett.103.165005|O. Schmitz, T.E. Evans, M.E. Fenstermacher, et al, ''Resonant Pedestal Pressure Reduction Induced by a Thermal Transport Enhancement due to Stochastic Magnetic Boundary Layers in High Temperature Plasmas'', Phys. Rev. Lett. '''103''' (2009) 165005]]</ref> | |||
However, recent results indicate that resonance is not strictly necessary to obtain a mitigating effect on ELMs from external field perturbations. | |||
<ref>[[doi:10.1103/PhysRevLett.106.225004|W. Suttrop, T. Eich, J.C. Fuchs, et al, ''First Observation of Edge Localized Modes Mitigation with Resonant and Nonresonant Magnetic Perturbations in ASDEX Upgrade'', Phys. Rev. Lett. '''106''' (2011) 225004]]</ref> | |||
== References == | |||
<references/> | |||