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

The EUROfusion MST1 Team

doi:10.1088/1741-4326/ab2211

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

The EUROfusion MST1 Team

Physics

Research output: Contribution to journal › Article › peer-review

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 - 26 Jun 2019

Keywords

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

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10.1088/1741-4326/ab2211

Dependence on plasma shape and plasma fueling for small ELM regimes in TCV and ASDEX Upgrade
© EURATOM 2019. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.
Accepted author manuscript, 8.36 MBLicence: CC BY-NC-ND

Cite this

@article{f36e67f69bc04193831e047d650f32d3,

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 = "{The EUROfusion MST1 Team} and B. Labit and T. Eich and Harrer, {G. F.} and E. Wolfrum and M. Bernert and Dunne, {M. G.} and L. Frassinetti and P. Hennequin and R. Maurizio and A. Merle and H. Meyer and S. Saarelma and U. Sheikh and J. Adamek and M. Agostini and D. Aguiam and R. Akers and R. Albanese and C. Albert and E. Alessi and R. Ambrosino and {Andr be}, Y. and C. Angioni and G. Apruzzese and M. Aradi and H. Arnichand and F. Auriemma and G. Avdeeva and Ayllon-Guerola, {J. M.} and F. Bagnato and Bandaru, {V. K.} and M. Barnes and L. Barrera-Orte and P. Bettini and R. Bilato and O. Biletskyi and P. Bilkova and W. Bin and C. Bowman and I. Cziegler and B. Dudson and S. Elmore and A. Fil and J. Harrison and B. Lipschultz and Ryan, {D. A.} and S. Smith and A. Thornton and K. Verhaegh and N. Walkden",

year = "2019",

month = jun,

day = "26",

doi = "10.1088/1741-4326/ab2211",

language = "English",

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

AU - The EUROfusion MST1 Team

AU - Labit, B.

AU - Eich, T.

AU - Harrer, G. F.

AU - Wolfrum, E.

AU - Bernert, M.

AU - Dunne, M. G.

AU - Frassinetti, L.

AU - Hennequin, P.

AU - Maurizio, R.

AU - Merle, A.

AU - Meyer, H.

AU - Saarelma, S.

AU - Sheikh, U.

AU - Adamek, J.

AU - Agostini, M.

AU - Aguiam, D.

AU - Akers, R.

AU - Albanese, R.

AU - Albert, C.

AU - Alessi, E.

AU - Ambrosino, R.

AU - Andr be, Y.

AU - Angioni, C.

AU - Apruzzese, G.

AU - Aradi, M.

AU - Arnichand, H.

AU - Auriemma, F.

AU - Avdeeva, G.

AU - Ayllon-Guerola, J. M.

AU - Bagnato, F.

AU - Bandaru, V. K.

AU - Barnes, M.

AU - Barrera-Orte, L.

AU - Bettini, P.

AU - Bilato, R.

AU - Biletskyi, O.

AU - Bilkova, P.

AU - Bin, W.

AU - Bowman, C.

AU - Cziegler, I.

AU - Dudson, B.

AU - Elmore, S.

AU - Fil, A.

AU - Harrison, J.

AU - Lipschultz, B.

AU - Ryan, D. A.

AU - Smith, S.

AU - Thornton, A.

AU - Verhaegh, K.

AU - Walkden, N.

PY - 2019/6/26

Y1 - 2019/6/26

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

M3 - Article

AN - SCOPUS:85070909412

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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