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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 to be 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, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);PEGOURIE B, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Journal of Nuclear Materials 337-339 (2005) 69-73
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://probe.usp.br/cgi-bin/sciserv.pl?collection=journals&journal=00223115
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