Poloidal localization of the explosive onset of edge localized modes

Author:

Trier E.ORCID,Hennequin P.ORCID,Maraschek M.,Giannone L.ORCID,Vanovac B.ORCID,

Abstract

Abstract In ASDEX Upgrade lower single null H-mode plasmas, the onset of the explosive phase of Edge Localized Modes (ELMs) is poloidally localized in the X-point/outer strike point (X/OSP) region. From this location, ELMs develop on average towards the low-field and high-field sides in typically 100 μ s . An associated magnetic activity localized in the X/OSP region is also observed in-between ELMs, at a lower level than at the ELM onset, and interpreted as being due to perturbed currents connected to the divertor target-s. Its broadband spectra typically extend up to 100 k H z –due to short-lived events of variable frequencies–and are dominated by n = 1 toroidal mode numbers rotating in the counter-current direction.

Funder

EUROfusion

Publisher

IOP Publishing

Subject

Condensed Matter Physics,Nuclear and High Energy Physics

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