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The model of the tungsten fuzz growth due to adatom diffusion is considered. Adatoms are created by helium ions bombarding the fuzz surface and diffuse along the fiber in both directions (towards the top and bottom). Only if there is an external force making movement towards the top preferential, the fiber can grow. We assume that this force is due to change of the surface binding energy of the adatom...
Cooling of tokamak boundary plasma owing to radiation of non-fully stripped lithium ions is considered as a promising way for protection of plasma facing elements (PFE) in tokamak. It may be effectively realized when the main part of lithium ions are involved in the closed circuit of migration between plasma and PFE surface. Such an approach may be implemented with the use of lithium device whose...
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