ELM-induced cold pulse propagation in ASDEX Upgrade

TitleELM-induced cold pulse propagation in ASDEX Upgrade
Publication TypeJournal Article
Year of Publication2019
AuthorsE. Trier, E. Wolfrum, M. Willensdorfer, Q. Yu, M. Hoelzl, F. Orain, F. Ryter, C. Angioni, M. Bernert, B. Vanovac, M.G Dunne, S.S Denk, J.C Fuchs, R. Fischer, P. Hennequin, B. Kurzan, F. Mink, A. Mlynek, T. Odstrcil, P.A Schneider, U. Stroth, G. Tardini, ASDEX-Upgrade Team, EUROfusion MST1 Team
JournalPlasma Physics and Controlled Fusion
Volume61
Issue4
Pagination045003
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.

DOI10.1088/1361-6587/aaf9c3
Division

FP

Department

TP

PID

0279758ced9029d70a2148b4f3b6cd99

Alternate TitlePlasma Phys. Control. Fusion
LabelOA

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