Desorption and adsorption

The characteristic features of various desorption processes are examined. Desorption plays significant roles in the plasma-wall interactions in two ways, which occur at the surface of the nuclear fusion devices. One is the impurity introduction process. Such impurity atoms as C an O on the first wall go into the plasma due to the desorption and cause the serious radiation loss. The other is the fuel gas recycling process. The hydrogen isotopes are adsorbed on the surface of the first wall and go back to the plasma due to the desorption. This process makes important contributions to the energy and particle balances of the plasma.