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Observations of systematic spatial modulation of low-Z impurity radiative emissions are analysed for Tore Supra ergodic divertor discharges limited on the inner wall. Some similarities to modulations previously observed with Marfe-like conditions are observed, but significant differences are also seen in the cases studied here. A simulation of the modulations is made, using the three-dimensional edge transport code BBQ. The simulations suggest that an important role is played by charge exchange with neutral deuterium, in addition to the ergodic divertor-induced modulations of the electron temperature. The interpretation highlights the important role of intermediate-Z states in impurity transport processes.

Additional information

Authors: HOGAN J, Oak Ridge National Laboratory, Oak Ridge (US);DE MICHELIS C ET AL, Association Euratom-CEA Cadarache, St Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, 44 (June 2002), pp. 673-687
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