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.
ELM-induced cold pulse propagation in ASDEX Upgrade
Trier, E.; Wolfrum, E.; Willensdorfer, M.; Yu Q.; Hoelzl M.; Orain F.; Ryter R.; Angioni C.; Bernert M.; Dunne M.G.; Denk S.S.; Fuchs J.C.; Fischer R.; Hennequin P.; Kurzan B.; Mink F.; Mlynek A.; Odstrcil T.; Schneider P.A.; Stroth U.; Tardini G.; Vanovac B.; ASDEX Upgrade Team; EUROfusion MST1 Team
Journal:
Plasma physics and controlled fusion (Print) 61 (4),
pp. 045003-1 - 045003-12
Year:
2019
ISTP Authors: Andrea Uccello
Marco De Angeli
Carlo Sozzi
Lionello Marrelli
Francesco Ghezzi
Gustavo Granucci
Paolo Innocente
Nicola Vianello
Saul Garavaglia
Italo Predebon
Monica Spolaore
Gianluca Spizzo
David Terranova
Matteo Zuin
William Bin
Lorenzo Figini
Matteo Agostini
Marco Gobbin
Silvana Nowak
Laura Laguardia
Enrico Perelli Cippo
Edoardo Alessi
Marco Valisa
Marco Tardocchi
Paola Mantica
Keywords: stochastic field, cold pulse, MHD instabilities, ELMs, Magnetic islands
Research Activitie: JOURNAL ARTICLES
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