Abstract
Desorption cross sections have been measured for the removal of deuterium from stainless steel by hydrogen ion impact. Using hydrogen ions with energies similar to those in the charge-exchange neutral flux striking the first-wall in tokamaks, the desorption cross section was determined for substrate temperatures < 170 K as a function of incident particle energy (in the range 300–1500 eV) and impact angle (30° to 80° with respect to the surface normal). Calculations of the cross section made with a modified version of the TRIM code are in good agreement with the experimental data. With the appropriate cross section information it becomes possible to estimate the release rate of surface hydroaen due to impact desorption expected during reactor operation.
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