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Abstract

Laboratory experiments are proposed to understand the growth mechanisms of spheroid carbon dust grains observed in Tokamaks with inside wall elements in graphite based materials. Different categories of solid grains in the nanometer size range are produced from graphite sputtering in rare gas plasmas. Dense primary particles are observed either individually or in the form of spherical agglomerates. The agglomeration process is likely stopped by Coulomb repulsion. Other particulates of higher size and cauliflower texture are formed by atomic-molecule accretion. Examples of these different cases are presented with specific characteristics provided by ex-situ diagnostics. A comparison with dust samples collected in Tore Supra or observed in other Tokamaks is proposed.

Additional information

Authors: ARNAS C, Laboratoire PIIM, UMR 6633 CNRS-Universite de Provence, Marseille (FR);DOMINIQUE C, Laboratoire PIIM, UMR 6633 CNRS-Universite de Provence, Marseille (FR);ROUBIN P, Laboratoire PIIM, UMR 6633 CNRS-Universite de Provence, Marseille (FR);MARTIN C, Laboratoire PIIM, UMR 6633 CNRS-Universite de Provence, Marseille (FR);LAFFON C, LURE, Centre Universitaire Paris-Sud, Orsay (FR);PARENT P, LURE, Centre Universitaire Paris-Sud, Orsay (FR);BROSSET C, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);PEGOURIE B, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: 16th Int. Conf. on Plasma Surface Interaction in controlled Fusion Devices Organised by: Massachusetts Institute of Technology, Plasma Science & Fusion Center, Cambridge (US) Held at: Holiday Inn By The Bay, Portla
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
Record Number: 200417584 / Last updated on: 2004-06-28
Category: PUBLICATION
Original language: en
Available languages: en
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