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Author(s):
K.J. Snowdon and H. Tawara
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Title:
Low Energy Molecule-Surface Interaction Processes of Relevance to Next-Generation Fusion Devices
Date of publication:
Mar. 1996
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Key words:
surfaces, scattering, molecules, desorption
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Abstract:
The mechanisms which may lead to molecular release or scattering from surfaces exposed to low energy (0.1 - 100 eV) particle irradiation or photon and electron irradiation are summarized. The charge and electronic state, angular, translational and intemal energies of the departing molecules are, where possible, described and the physical origin of the characteristics of each distribution explained. On the basis of our current understanding of these surface processes, we argue for the use of medium- to high-Z metal surfaces in plasma facing components of the gas-blanket type divertor recently proposed for ITER. By operating such surfaces at sufficiently elevated temperatures, the release of highly vibrationally excited hydrogen molecules via Eley-Rideal-like surface recombination reactions could be suppressed.
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