ELM-induced cold pulse propagation in ASDEX Upgrade

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http://hdl.handle.net/10138/300062

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ASDEX Upgrade Team , EUROfusion MST1 Team , Trier , E , Hakola , A , Aho-Mantila , L , Lahtinen , A & Marchand , B 2019 , ' ELM-induced cold pulse propagation in ASDEX Upgrade ' , Plasma Physics and Controlled Fusion , vol. 61 , no. 4 , 045003 . https://doi.org/10.1088/1361-6587/aaf9c3

Title: ELM-induced cold pulse propagation in ASDEX Upgrade
Author: ASDEX Upgrade Team; EUROfusion MST1 Team; Trier, E.; Hakola, A.; Aho-Mantila, L.; Lahtinen, A.; Marchand, B.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-04
Language: eng
Number of pages: 12
Belongs to series: Plasma Physics and Controlled Fusion
ISSN: 0741-3335
URI: http://hdl.handle.net/10138/300062
Abstract: In ASDEX Upgrade, the propagation of cold pulses induced by type-I edge localized modes (ELMs) is studied using electron cyclotron emission measurements, in a dataset of plasmas with moderate triangularity. It is found that the edge safety factor or the plasma current are the main determining parameters for the inward penetration of the T-e perturbations. With increasing plasma current the ELM penetration is more shallow in spite of the stronger ELMs. Estimates of the heat pulse diffusivity show that the corresponding transport is too large to be representative of the inter-ELM phase. Ergodization of the plasma edge during ELMs is a possible explanation for the observed properties of the cold pulse propagation, which is qualitatively consistent with non-linear magneto-hydro-dynamic simulations.
Subject: ELMs
MHD instabilities
stochastic field
magnetic islands
cold pulse
PARTICLE LOSSES
HEAT-TRANSPORT
H-MODE
ENERGY
CONFINEMENT
STABILITY
TOKAMAK
114 Physical sciences
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