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

B. Labit*, T. Eich, G. F. Harrer, A. Palha, G. Rocchi, A. Romano, G. Rubino, J. Santos, M. Scheffer, More Authors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

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.

Original languageEnglish
Article number086020
JournalNuclear Fusion
Volume59
Issue number8
DOIs
Publication statusPublished - 2019
Externally publishedYes

Keywords

  • ballooning modes
  • grassy ELMs
  • H-mode
  • plasma triangularity
  • separatrix density
  • type-II ELMs

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