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; null More Authors

doi:10.1088/1741-4326/ab2211

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 journal › Article › Scientific › peer-review

34 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 (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.

Original language	English
Article number	086020
Journal	Nuclear Fusion
Volume	59
Issue number	8
DOIs	https://doi.org/10.1088/1741-4326/ab2211
Publication status	Published - 2019
Externally published	Yes

Keywords

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

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10.1088/1741-4326/ab2211

Cite this

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

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.",

keywords = "ballooning modes, grassy ELMs, H-mode, plasma triangularity, separatrix density, type-II ELMs",

author = "B. Labit and T. Eich and Harrer, {G. F.} and A. Palha and G. Rocchi and A. Romano and G. Rubino and J. Santos and M. Scheffer and {More Authors}",

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T1 - Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade

AU - Labit, B.

AU - Eich, T.

AU - Harrer, G. F.

AU - Palha, A.

AU - Rocchi, G.

AU - Romano, A.

AU - Rubino, G.

AU - Santos, J.

AU - Scheffer, M.

AU - More Authors, null

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - ballooning modes

KW - grassy ELMs

KW - H-mode

KW - plasma triangularity

KW - separatrix density

KW - type-II ELMs

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U2 - 10.1088/1741-4326/ab2211

DO - 10.1088/1741-4326/ab2211

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SN - 0029-5515

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 8

M1 - 086020

ER -

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

Abstract

Keywords

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