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Inter-ELM pedestal evolution in low triangularity JET-ILW discharges
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2017 (English)In: 44th EPS Conference on Plasma Physics, EPS 2017, European Physical Society (EPS) , 2017Conference paper, Published paper (Refereed)
Abstract [en]

Studies of the pedestal stability in low triangularity, d=0.2, JET ITER-Like Wall discharges are presented, following the evolution between ELMs. The pressure gradient tracks the ideal MHD ballooning threshold, only lagging behind it when the threshold rises rapidly as the plasma penetrates the second stability region. This is consistent with a role for the kinetic ballooning mode in the pedestal structure. When the plasma has second stability access, e.g. for low gas puff discharges, the peeling-ballooning mode is marginally stable at ELM onset. In cases where there is no second stability access the discharges are some way short of the peeling-ballooning threshold, so this alone cannot be the trigger for the ELM. A low amplitude sinusoidal oscillation in the Be-II emission is observed that correlates well with the ELMs, and has an associated high frequency magnetic field fluctuation, ~100-250kHz, with modulated amplitude. This might be associated with a new filamentary equilibrium state. 

Place, publisher, year, edition, pages
European Physical Society (EPS) , 2017.
Keywords [en]
Beryllium compounds, Magnetohydrodynamics, Plasma stability, Ballooning modes, Equilibrium state, Gas puff, High-frequency magnetic field, Low-amplitude, Pedestal structure, Sinusoidal oscillations, Stability regions, Electric discharges
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-246611Scopus ID: 2-s2.0-85055043767OAI: oai:DiVA.org:kth-246611DiVA, id: diva2:1324931
Conference
44th European Physical Society Conference on Plasma Physics, EPS 2017, 26 June 2017 through 30 June 2017
Note

QC 20190614

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-06-14Bibliographically approved

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Frassinetti, Lorenzo

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