On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity

TitleOn the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity
Publication TypeJournal Article
Year of Publication2011
AuthorsB.J Tobias, R.L Boivin, J.E Boom, I.G.J. Classen, C.W. Domier, A.JH Donne, W.W Heidbrink, NC Luhmann, Jr., T. Munsat, C.M Muscatello, R. Nazikian, H.K Park, D.A Spong, A.D Turnbull, M.A VanZeeland, G.S Yun
JournalPhysics of Plasmas
Volume18
Issue5
Number5
Pagination056107
Date PublishedMay
Type of ArticleProceedings Paper
ISBN Number1070-664X
KeywordsAXISYMMETRICAL TOROIDAL PLASMAS, GYROFLUID MODEL, TOKAMAK PLASMAS
Abstract

Two-dimensional (2D) imaging of electron temperature perturbations provides a powerful constraint for validating theoretical models describing magnetohydrodynamic plasma behavior. In observation of Alfven wave induced temperature fluctuations, electron cyclotron emission imaging provides unambiguous determination of the 2D eigenmode structure. This has provided support for nonperturbative eigenmode solvers which predict symmetry breaking due to poloidal flows in the fast ion population. It is shown that for Alfven eigenmodes, and in cases where convective flows or saturated perturbations lead to nonaxisymmetric equilibria, electron plasma displacements oriented parallel to a gradient in mean temperature are well defined. Furthermore, during highly dynamic behavior, such as the sawtooth crash, highly resolved 2D temperature behaviors yield valuable insight. In particular, addressing the role of adiabatic heating on time scales much shorter than the resistive diffusion time through the additional diagnosis of local electron density allows progress to be made toward a comprehensive understanding of fast reconnection in tokamak plasmas. (C) 2011 American Institute of Physics.

URLhttp://repository.tue.nl/fcefb096-2876-4116-94a0-3759550d00a0
DOI10.1063/1.3563572
Division

FP

Department

PDG

PID

f9c5c587ba9caa17f000207dd4d83de3

Alternate TitlePhys. Plasmas

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