Anomalous thermal confinement in ohmically heated tokamaks
- 1 November 1986
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 26 (11), 1515-1528
- https://doi.org/10.1088/0029-5515/26/11/007
Abstract
A model is proposed for explaining the behaviour of the gross energy confinement time in ohmically heated tokamak plasmas. The analysis takes into account the effect of the anomalous thermal conductivity due to small scale turbulence and the effect of the macroscopic MHD behaviour which provides some constraints on the temperature profile. The results indicate that the thermal conductivity associated with the dissipative trapped-electron mode can account for Neo-Alcator scaling and the thermal conductivity associated with the ion temperature gradient mode can account for the saturation of the energy confinement time with density. Comparisons with experimental results show reasonable agreement.Keywords
This publication has 23 references indexed in Scilit:
- Transport in tokamaks – a review of experimentNuclear Fusion, 1983
- Scaling of energy confinement with minor radius, current and density in Doublet III Ohmically heated plasmasNuclear Fusion, 1982
- Effect of finite aspect ratio on the neoclassical ion thermal conductivity in the banana regimePhysics of Fluids, 1982
- Energy confinement at high density in the FT tokamakNuclear Fusion, 1982
- Tokamak scaling laws, with special emphasis on TFR experimental resultsNuclear Fusion, 1980
- Plasma Confinement Studies in the ISX-TokamakPhysical Review Letters, 1979
- Empirical scaling laws for energy confinement in Ohmically-heated tokamaksNuclear Fusion, 1979
- High-Density Discharges in the Alcator TokamakPhysical Review Letters, 1977
- Reply to “Comments on the paper ‘Characteristics of high-density tokamak ignition reactors’”Nuclear Fusion, 1976
- Theory of plasma transport in toroidal confinement systemsReviews of Modern Physics, 1976