Poloidal localization of the explosive onset of edge localized modes

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 10...

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Bibliographic Details
Published in:Nuclear fusion 2024-02, Vol.64 (2), p.26004
Main Authors: Trier, E., Hennequin, P., Maraschek, M., Giannone, L., Vanovac, B.
Format: Article
Language:English
Subjects:
ELMs
magnetic fluctuations
Physics
Plasma Physics
tokamaks
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Summary: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.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ad13ae