Simulation of first−wall radiation effects

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Abstract
Many of the effects induced in metals as a result of exposure to a radiation environment are intimately associated with the energy of primary recoil atoms (PKAs). Protons with an energy of 16 MeV closely reproduce the PKA energy spectrum which will be present at the first wall in a D−T fusion reactor and should therefore closely reproduce the radiation effects induced by PKAs in the first wall. We have conducted a preliminary experiment with protons to measure the sputtering rate and to look for the phenomenon of chunk emission recently observed by Kaminsky and co−workers in samples exposed to 14−MeV neutrons. We are also able to observe the average projected transport range of activated PKAs.

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