Within the EUROfusion MST1 work package, a series of experiments has been conducted on AUG and TCV devices to disentangle the role of plasma fueling and plasma shape for the onset of small ELM regimes. On both devices, small ELM regimes with high confinement are achieved if and only if two conditions are fulfilled at the same time. Firstly, the plasma density at the separatrix must be large enough (n(e,sep)/n(G) similar to 0.3), leading to a pressure profile flattening at the separatrix, which stabilizes type-I ELMs. Secondly, the magnetic configuration has to be close to a double null (DN), leading to a reduction of the magnetic shear in the extreme vicinity of the separatrix. As a consequence, its stabilizing effect on ballooning modes is weakened.

Labit, B., Eich, T., Harrer, G.f., Wolfrum, E., Bernert, M., Dunne, M.g., et al. (2019). Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade. NUCLEAR FUSION, 59(8), 086020 [10.1088/1741-4326/ab2211].

Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade

D. Carnevale;G. De Carolis;S. Galeani;M. Sassano;
2019-01-01

Abstract

Within the EUROfusion MST1 work package, a series of experiments has been conducted on AUG and TCV devices to disentangle the role of plasma fueling and plasma shape for the onset of small ELM regimes. On both devices, small ELM regimes with high confinement are achieved if and only if two conditions are fulfilled at the same time. Firstly, the plasma density at the separatrix must be large enough (n(e,sep)/n(G) similar to 0.3), leading to a pressure profile flattening at the separatrix, which stabilizes type-I ELMs. Secondly, the magnetic configuration has to be close to a double null (DN), leading to a reduction of the magnetic shear in the extreme vicinity of the separatrix. As a consequence, its stabilizing effect on ballooning modes is weakened.
2019
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-INF/04 - AUTOMATICA
English
H-mode
type-II ELMs
grassy ELMs
plasma triangularity
separatrix density
ballooning modes
Labit, B., Eich, T., Harrer, G.f., Wolfrum, E., Bernert, M., Dunne, M.g., et al. (2019). Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade. NUCLEAR FUSION, 59(8), 086020 [10.1088/1741-4326/ab2211].
Labit, B; Eich, T; Harrer, Gf; Wolfrum, E; Bernert, M; Dunne, Mg; Frassinetti, L; Hennequin, P; Maurizio, R; Merle, A; Meyer, H; Saarelma, S; Sheikh, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/250263
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