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

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

Journal Article (2019)

Author(s)

B. Labit (École Polytechnique Fédérale de Lausanne)

T. Eich (EURATOM Association)

G. F. Harrer (Technische Universität Wien)

A. Palha (Eindhoven University of Technology)

G. Rocchi (University of Cassino and Southern Lazio)

A. Romano (University of Cassino and Southern Lazio)

G. Rubino (Consorzio Rfx)

J. Santos (Universidade Técnica de Lisboa)

M. Scheffer (Eindhoven University of Technology)

undefined More Authors (External organisation)

Ballooning modes Grassy ELMs H-mode Plasma triangularity Separatrix density Type-II ELMs

DOI related publication

https://doi.org/10.1088/1741-4326/ab2211 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:3405586e-49b0-46fb-870a-d62a2f6557f5

More Info

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Publication Year

2019

Language

English

Issue number

8

Volume number

59

Article number

086020

Downloads counter

195

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 ∼ 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.