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Determination of JET scrape-off layer transport coefficients using an interpretative “onion-skin” plasma model

Journal of Nuclear Materials
Publication Date
DOI: 10.1016/0022-3115(94)00550-8
  • Section Iv. Poster Session B


Abstract Currently there is much interest in the application of sophisticated 2D codes to model the scrape-off layer (SOL) plasma in divertor tokamaks. These models generate the plasma solution at the divertor target starting from boundary conditions defined on a closed flux surface near the separatrix. An alternative approach, used within the DIVIMP code [1], is to anchor the boundary conditions at the divertor target using experimental Langmuir probe measurements and then solve the 1D fluid equations along each flux tube in the SOL generating an “onion-skin” model. Interaction of the plasma with recycled neutrals is included by coupling to a 2D neutral transport code. Such a model has been applied to analyse the SOL plasma transport in JET divertor discharges from the previous experimental campaign. Following the approach of Shimizu et al. [2], the radial variation of the anomalous cross-field transport coefficients ( D ⊥, χ ⊥) are evaluated over a range of discharges and compared with results from a 2D predictive code.

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