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In the first part pf this work, we present the Tore Supra database, which contains 56 well-documented discharges summarizing the main physical features of particle control in the ergodic divertor configuration. Then, we discuss the physical processes that govern particle collection: ion pumping (ballistic collection, essentially a geometrical effect) and neutral pumping (ions recycling on the neutralizer plates are re-emitted towards the plasma under molecular form; dissociation and charge-exchange reactions back-scatter a part of the neutral flux towards the neutralizer plates, where it can be pumped). These two processes are modelling accounting for a realistic description of the divertor geometry. A comparison between simulations and experiments is presented for measurements characterizing the three main actors of plasma-wall interaction: the edge plasma (input of the calculation), the D-alpha light emission which characterizesw the ionization source, and the neutral pressure in the divertor plenum which characterizes the extracted flux.

Additional information

Authors: AZEROUSAL A, Association Euratom-CEA, Departement de Recherches sur la Fusion Controlee, CEA.Cadarache, Saint Paul Lez Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1695 EN (2000) 203 pp.
Availability: Available from Association Euratom-CEA, Saint Paul Lez Durance (FR)
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