EFDA-JET-CP(05)02/41

Modelling JET Divertor Physics with the EDGE2D Code

Most single-null divertor tokamak experiments show strong in-out asymmetries in particle and heat fluxes connected to asymmetries in divertor density, temperature and radiation. As shown in many divertor tokamaks [1-4] and recently on JET [5,6], the imbalances strongly depend on the direction of the toroidal magnetic field (BT) and are thus most probably a result of particle cross-field drifts. Experimentally observed outer-inner divertor power asymmetry PTouter/PTinner could not be explained by the asymmetry in the tomographically resolved divertor radiation alone [6]. Unequal power sharing between the two targets is most likely caused by the larger outboard area, enhanced radial transport on low field side (which is independent of the B¥B-direction), and classical drift effects which reverse with the B¥B-direction. This contribution presents analysis of experimental results using the EDGE2D/NIMBUS code.
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EFDC050241 1012.26 Kb