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 (ne,sep/nG ∼ 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., Wolfrum, E., Bernert, M., Dunne, M., 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

Cavedon M.;Dal Molin A.;Feng S.;Gorini G.;GRANUCCI, GUSTAVO;MARIANI, ALBERTO;Sozzi C.;Tardocchi M.;
2019

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 (ne,sep/nG ∼ 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.
Articolo in rivista - Articolo scientifico
ballooning modes; grassy ELMs; H-mode; plasma triangularity; separatrix density; type-II ELMs;
ballooning modes; grassy ELMs; H-mode; plasma triangularity; separatrix density; type-II ELMs
English
2019
59
8
086020
086020
none
Labit, B., Eich, T., Harrer, G., Wolfrum, E., Bernert, M., Dunne, M., 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].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/247035
Citazioni
  • Scopus 40
  • ???jsp.display-item.citation.isi??? 37
Social impact