High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade

ASDEX Upgrade Team EUROfusion MST1 team

doi:10.1088/1361-6587/ab2575

High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade

ASDEX Upgrade Team EUROfusion MST1 team

Chair of Plasmarand- und Divertorphysik

Max Planck Institute for Plasma Physics
IRFM, CEA
Instituto Superior Técnico
LORIA, UMR 7503, University of Lorraine

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

9 Scopus citations

Abstract

The results on high frequency coherent modes developing at the plasma edge after L-H transitions are presented. These edge coherent modes (ECMs) observed in the I-phase, during ELM-free and ELMy H-mode phases have common characteristics, such as their frequency of 50-200 kHz, radial position and scaling of the frequency with the pressure gradient. The ultra-fast swept reflectometer with the sweep time of 1 μs has provided measurements of the mode dynamics and localisation. The ECMs propagate in the electron diamagnetic direction in the laboratory frame and are localized in the region between the pedestal top and the steepest pressure gradient.

Original language	English
Article number	085011
Journal	Plasma Physics and Controlled Fusion
Volume	61
Issue number	8
DOIs	https://doi.org/10.1088/1361-6587/ab2575
State	Published - 21 Jun 2019

Keywords

L-H transition
coherent modes
fusion
magnetic confinement
plasma physics
turbulence

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10.1088/1361-6587/ab2575

Cite this

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title = "High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade",

abstract = "The results on high frequency coherent modes developing at the plasma edge after L-H transitions are presented. These edge coherent modes (ECMs) observed in the I-phase, during ELM-free and ELMy H-mode phases have common characteristics, such as their frequency of 50-200 kHz, radial position and scaling of the frequency with the pressure gradient. The ultra-fast swept reflectometer with the sweep time of 1 μs has provided measurements of the mode dynamics and localisation. The ECMs propagate in the electron diamagnetic direction in the laboratory frame and are localized in the region between the pedestal top and the steepest pressure gradient.",

keywords = "L-H transition, coherent modes, fusion, magnetic confinement, plasma physics, turbulence",

author = "\{ASDEX Upgrade Team EUROfusion MST1 team\} and A. Medvedeva and C. Bottereau and F. Clairet and Conway, \{G. D.\} and P. Manz and F. Mink and V. Nikolaeva and D. Prisiazhniuk and U. Stroth and E. Wolfrum and A. Biancalani and S. Heuraux and D. Molina and A. Silva",

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year = "2019",

month = jun,

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doi = "10.1088/1361-6587/ab2575",

language = "English",

volume = "61",

journal = "Plasma Physics and Controlled Fusion",

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TY - JOUR

T1 - High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade

AU - ASDEX Upgrade Team EUROfusion MST1 team

AU - Medvedeva, A.

AU - Bottereau, C.

AU - Clairet, F.

AU - Conway, G. D.

AU - Manz, P.

AU - Mink, F.

AU - Nikolaeva, V.

AU - Prisiazhniuk, D.

AU - Stroth, U.

AU - Wolfrum, E.

AU - Biancalani, A.

AU - Heuraux, S.

AU - Molina, D.

AU - Silva, A.

PY - 2019/6/21

Y1 - 2019/6/21

N2 - The results on high frequency coherent modes developing at the plasma edge after L-H transitions are presented. These edge coherent modes (ECMs) observed in the I-phase, during ELM-free and ELMy H-mode phases have common characteristics, such as their frequency of 50-200 kHz, radial position and scaling of the frequency with the pressure gradient. The ultra-fast swept reflectometer with the sweep time of 1 μs has provided measurements of the mode dynamics and localisation. The ECMs propagate in the electron diamagnetic direction in the laboratory frame and are localized in the region between the pedestal top and the steepest pressure gradient.

AB - The results on high frequency coherent modes developing at the plasma edge after L-H transitions are presented. These edge coherent modes (ECMs) observed in the I-phase, during ELM-free and ELMy H-mode phases have common characteristics, such as their frequency of 50-200 kHz, radial position and scaling of the frequency with the pressure gradient. The ultra-fast swept reflectometer with the sweep time of 1 μs has provided measurements of the mode dynamics and localisation. The ECMs propagate in the electron diamagnetic direction in the laboratory frame and are localized in the region between the pedestal top and the steepest pressure gradient.

KW - L-H transition

KW - coherent modes

KW - fusion

KW - magnetic confinement

KW - plasma physics

KW - turbulence

UR - https://www.scopus.com/pages/publications/85070647928

U2 - 10.1088/1361-6587/ab2575

DO - 10.1088/1361-6587/ab2575

M3 - Article

AN - SCOPUS:85070647928

SN - 0741-3335

VL - 61

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 8

M1 - 085011

ER -

High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade

Abstract

Keywords

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