Community Research and Development Information Service - CORDIS


In a tokamak thermonuclear reactor, impurity control is essential to keep the plasma in fusion conditions. In the Tore Supra tokamak, the main impurity is carbon. This study examines the carbon production mechanisms on the neutraliser plates of the Tore Supra Ergodic Divertor by means of an endoscope and other plasma edge diagnostics. This allowed an estimation of the atom flux extracted from the neutraliser plates during the various density regimes accessed in ED configuration. Comparison of the calculated experimental sputtering yield with the theoretical yield shows that when the edge electron temperature is above 30 eV, the self-sputtering process is the dominant phenomenon for impurity production and bulk contamination. This information was then used to study transport and radiation of this impurity near the neutraliser plates, and thus to characterise the circulation of carbon in the plasma edge and to determine the carbon fraction which enters the confined plasma and the fraction which is rapidly driven back onto the wall by the plasma flux.

This study was presented for a doctoral thesis at the University of Paris VI on 9 November 2001. .

Additional information

Authors: CORRE Y, Association EURATOM-CEA, CEA/Cadarache, Saint Paul Lez Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1722, December 2001, pp. 219. Euro:Free of charge.
Availability: Available from: Association EURATOM-CEA sur la Fusion Controlee, CEA/Cadarache, F-13108 Saint Paul Lez Durance (FR)
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