  The sputtering of inside wall components of tokamaks can lead to the
injection of supersaturated vapour in the plasma edge. The resulting
condensation favours the formation of clusters which can give rise to solid
particulates by further accretion. Sputtering discharges are proposed to have
highlight on the formation of carbonaceous dust observed in the tokamaks with
graphite based wall components. The flux of the sputtered carbon atoms is
evaluated in the conditions of our laboratory discharges as well as the
evolution of their energy distribution. It is shown that a cooling mechanism
occurs through collisions with the discharge argon atoms, leading to a
nucleation phase. A comparison between the carbon structure of the resulting
dust particles and a dust sample collected in the Tore Supra tokamak is
proposed. The structural differences are discussed and can be correlated to
specific plasma conditions.
