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15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
Abstract:
The new island divertor in W7-AS enables quasi steady-state operation with NBI at very high
density including scenarios with stable detachment from the targets. Experiments with reversed
B-field indicate that the interaction zones on the targets are affected in first order by E×B drifts.
Stable detachment is restricted to magnetic field configurations with sufficiently large separation
between x-points and targets and not too small field line pitch inside the islands. It is always partial
in the sense that it does not extend over the full target area. This inhomogeneity is ascribed to an
in/out asymmetry of the electron temperature at the upstream separatrix position.
