Depletion of hydrogenoid atoms from the carbonized layer in Tore Supra

The wall production of deuterium and hydrogen during an helium glow discharge of 1.6x105 s has been studied after 100 deuterium plasma shots in Tore Supra. After a transient, the desorption followed a t-1 time behaviour for the deuterium a t-1/2 behaviour for the hydrogen. The results are discussed in terms of ion-induced release for the deuterium and a diffusion-limited mechanism for the hydrogen. The values obtained for the different parameters are in good agreement with the relevant data of the literature. (orig.)