Velocimetry analysis of type-I edge localized mode precursors in ASDEX Upgrade

TitleVelocimetry analysis of type-I edge localized mode precursors in ASDEX Upgrade
Publication TypeJournal Article
Year of Publication2014
AuthorsP. Manz, J.E Boom, E. Wolfrum, G. Birkenmeier, I.G.J. Classen, N.C Luhmann, Jr., U. Stroth
JournalPlasma Physics and Controlled Fusion
Volume56
Issue3
Pagination035010
Date PublishedMar
ISBN Number0741-3335; 1361-6587
Abstract

When the electron transport barrier remains in its final shape before a type-I edge localized mode (ELM) crash in ASDEX Upgrade, ELM precursors appear as electron temperature fluctuations. In order to relate these precursors to an instability, spatial scales, parity and the cross-phase between electron temperature and radial velocity fluctuations are evaluated by means of velocimetry of measured 2D electron temperature fluctuations. A comprehensive comparison with properties of different instabilities points to microtearing modes. Bispectral analysis indicates a nonlinear coupling of these precursors to a ballooning-type mode prior to the ELM onset.

DOI10.1088/0741-3335/56/3/035010
Division

FP

Department

PDG

PID

1a141e91f9102cfcc78a01ef55826c69

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