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

Research output: Contribution to journalArticlepeer-review

Author(s)

  • The EUROfusion MST1 Team

Department/unit(s)

Publication details

JournalNuclear Fusion
DateAccepted/In press - 16 May 2019
DatePublished (current) - 26 Jun 2019
Issue number8
Volume59
Original languageEnglish

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.

    Research areas

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

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