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

Research output: Contribution to journalArticleScientificpeer-review

2 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
Number of pages13
JournalNuclear Fusion
Volume59
Issue number8
DOIs
Publication statusPublished - 26 Jun 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

refueling
ballooning modes
flattening
plasma density
shear
profiles
configurations

Keywords

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

Cite this

@article{ed64e1bf8bb048b1a010b90381ac8624,
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 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 P. Blanchard and T. Blanken and V. Bobkov and A. Bock and D. Boeyaert and K. Bogar and O. Bogar and A. Hakola and A. Lahtinen and J. Likonen and A. Salmi and T. Tala",
year = "2019",
month = "6",
day = "26",
doi = "10.1088/1741-4326/ab2211",
language = "English",
volume = "59",
journal = "Nuclear Fusion",
issn = "0029-5515",
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}

Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade. / Culham Science Centre.

In: Nuclear Fusion, Vol. 59, No. 8, 086020, 26.06.2019.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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 - 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 - Blanchard, P.

AU - Blanken, T.

AU - Bobkov, V.

AU - Bock, A.

AU - Boeyaert, D.

AU - Bogar, K.

AU - Bogar, O.

AU - Hakola, A.

AU - Lahtinen, A.

AU - Likonen, J.

AU - Salmi, A.

AU - Tala, T.

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

UR - http://www.scopus.com/inward/record.url?scp=85070909412&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/ab2211

DO - 10.1088/1741-4326/ab2211

M3 - Article

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 8

M1 - 086020

ER -