Raman spectroscopy and X-ray diffraction studies of some deposited carbon layers in Tore Supra

摘要: Carbon deposited layers collected in Tore Supra on the neutralizers, toroidal pumped limiter and vertical outboard have been analysed by X-ray diffraction Raman spectroscopy. Both techniques show that these samples are highly disordered, mainly consisting of graphite-like nanoparticles. They not similar to amorphous or hydrogenated carbons: this is consistent with low amount deuterium found trapped inside. Their structure can be related their vicinity plasma, particle bombardment inducing high temperature preventing full amorphization. Samples exposed highest fluency machine largest degree disorder, probably a minor contribution three-dimensional which may due formation bonds deuterium.