Title | Determination of the heat diffusion anisotropy by comparing measured and simulated electron temperature profiles across magnetic islands |
Publication Type | Journal Article |
Year of Publication | 2009 |
Authors | M. Holzl, S. Gunter, I.G.J. Classen, Q. Yu, E. Delabie |
Journal | Nuclear Fusion |
Volume | 49 |
Number | 11 |
Pagination | 7 |
Date Published | Nov |
Type of Article | Article |
ISBN Number | 0029-5515 |
Accession Number | ISI:000272077800010 |
Keywords | PLASMAS, 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 Title | Nucl. Fusion |
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