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Abstract

Analysis of 2D interchange simulation in the Scrape-Off Layer indicates that intermittent outbursts of density dominate the transport process. It is possible to define density fronts, namely over-dense regions that follow ballistic trajectories in the SOL. The scaling law that relates the SOL width ë to the connection length L(//) is modified compared to the standard diffusive scaling. The simulations lead to Lambda(oc) L(//){0.623). An analytical model based on the interplay between the average density and the over-dense fronts yields an exponent 5/8 (0.625). Such a departure from a diffusive scaling tends to yield a larger SOL width but, as a consequence, enhances the plasma-wall interaction in the main chamber and lowers the separatrix density at given particle source.

Additional information

Authors: GHENDRIH PH, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);SARAZIN Y, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);FALCHETTO G, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GARBET X, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GRANDGIRARD V, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);OTTAVIANI M., Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);KAW P, Institute for Plasma Research, Bhat, Gandhinagar (IN);BEYER P, UMR 6633 PIIM CNRS-Universite de Provence, Marseille (FR);BENKADDA S, UMR 6633 PIIM CNRS-Universite de Provence, Marseille (FR)
Bibliographic Reference: An oral paper given at: 20th IAEA Fusion Energy Conference Organised by: International Atomic Energy Agency Held at: Centrtro de Fusao Nuclear, Vilamoura (PT)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
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