Resonant magnetic perturbations and divertor footprints in poloidally diverted tokamaks

Abstract

General formula describing both the divertor strike point splitting and width of magnetic islands created by resonant magnetic perturbations (RMPs) in a poloidally diverted tokamak equilibrium is derived. Under the assumption that the RMP is produced by coils at the low-field side such as those used to control edge localized modes (ELMs) it is demonstrated that the width of islands on different magnetic surfaces at the edge and the amount of divertor splitting are related to each other. Explanation is provided of aligned maxima of the perturbation spectra with the safety factor profile - an effect empirically observed in models of many perturbation coil designs.

arXiv comment8 pages, revtex

Cited by in corpus (10)

• Observation of lobes near the X-point in resonant magnetic perturbation experiments on MAST
• Understanding ELM mitigation by resonant magnetic perturbations on MAST
• Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade
• Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points
• The effect of resonant magnetic perturbations on the divertor heat and particle fluxes in MAST
• Effect of resonant magnetic perturbations with toroidal mode numbers of 4 and 6 on ELMs in single null H-mode plasmas in MAST
• Current understanding of the processes underlying the triggering of and energy loss associated with type I ELMs
• Understanding the effect resonant magnetic perturbations have on ELMs
• Divertor heat fluxes and profiles during mitigated and unmitigated Edge Localised Modes (ELMs) on the Mega Amp Spherical Tokamak (MAST)
• Strike point splitting induced by the application of magnetic perturbations on MAST