Determination of the heat diffusion anisotropy by comparing measured and simulated electron temperature profiles across magnetic islands

TitleDetermination of the heat diffusion anisotropy by comparing measured and simulated electron temperature profiles across magnetic islands
Publication TypeJournal Article
Year of Publication2009
AuthorsM. Holzl, S. Gunter, I.G.J. Classen, Q. Yu, E. Delabie
JournalNuclear Fusion
Volume49
Number11
Pagination7
Date PublishedNov
Type of ArticleArticle
ISBN Number0029-5515
Accession NumberISI:000272077800010
KeywordsPLASMAS, TRANSPORT
Abstract

The ratio between the heat diffusion coefficients parallel and perpendicular to the magnetic field lines, chi(parallel to)/chi(perpendicular to), influences the flattening of the temperature profile inside magnetic islands and the driving term of neoclassical tearing modes (Fitzpatrick 1995 Phys. Plasmas 2 825). The value of this anisotropy is, however, not easily accessible experimentally. This paper presents a method to determine it from a systematic comparison of temperature measurements at magnetic islands with numerical heat diffusion simulations. The application of the method is demonstrated for a 2/1 magnetic island in the TEXTOR tokamak, where a heat diffusion anisotropy of 108 is observed. This is lower by a factor of 40 than predicted by Spitzer and Harm (Spitzer and Harm 1953 Phys. Rev. 89 997) and a strong indication that the heat flux limit determines the flattening of the electron temperature across magnetic islands.

URL<Go to ISI>://000272077800010
Division

Fusion Physics

PID

6e60395a5474ea3ffb8eaa63d8dfd5a9

Alternate TitleNucl. Fusion

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