Abstract
Beryllium metal has been proposed as a low-Z material for a first-wall coating or liner in tokamak reactor vacuum vessel applications. In this connection, the effects of ion bombardment on the impurity release and erosion properties of beryllium need to be ascertained. The present work has focussed on the effects of oxygen and nitrogen bombardment on the secondary photon and secondary ion emission properties of beryllium. The most significant finding is that both the secondary photon and ion emission are strongly enhanced as a result of oxygen and nitrogen bombardment. This finding is of potential importance to impurity control and transport problems associated with fusion reactor applications of beryllium.
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