Structure of the carbon layers deposited on the toroidal pump limiter of Tore Supra

Céline Martin (1) , Rémi Ruffe (1) , Cédric Pardanaud (1) , Martiane Cabié (2) , Christian Dominici (2) , Timo Dittmar (3) , Pascal Languille (3) , Bernard Pégourié (3) , Emmanuelle Tsitrone (3) , Pascale Roubin (1)

1 PIIM - Physique des interactions ioniques et moléculaires
2 AMU SPEC - Spectropôle - Aix Marseille Université
3 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique

Scanning and transmission electron microscopy analyses have been performed for tiles extracted from the toroidal pump limiter of Tore Supra for erosion- and deposition-dominated zones. Deposit thicknesses have been estimated for the plasma-facing top and the gap side lateral surfaces. Deposit thickness profiles have been measured inside gaps, showing that deposition mainly occurs in the first millimetre and that both poloidal and toroidal gap deposition is asymmetric. Quantitative information on the deposit volume and on D-retention are thus obtained from these measurements. Carbon probed at the tile top surfaces is mainly amorphous carbon, due either to the amorphization induced by ion bombardment in the erosion dominated zone, or to deposit formation processes in the deposition-dominated zones. Deposits are tip-shaped and are oriented, which should give information on transport processes.

Mots clés: Carbon; Fusion; Electron microscopy; Microstructure and texture; Redeposition; Tore Supra; Erosion and deposition; Deuterium inventory; Surface analysis; Amorphous films.; Amorphous films

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Physique des plasmas [physics.plasm-ph]

Céline Martin, Rémi Ruffe, Cédric Pardanaud, Martiane Cabié, Christian Dominici, et al.. Structure of the carbon layers deposited on the toroidal pump limiter of Tore Supra. Journal of Nuclear Materials, 2010, ⟨10.1016/j.jnucmat.2010.11.006⟩. ⟨hal-00542718⟩