Abstract
A Two-Reservoir Model for recycling of hydrogenic atoms at graphite surfaces in JET is presented. Analysis of density transients induced by Neutral Beam Injection (NBI) and other modes of operation are used to determine the parameters of the model. In addition to describing many observed features of transient density and recycling behaviour, the model also reproduces an asymptotic external fuelling efficiency, ϵ<l. A non-saturable pumping effect due to dynamic retention, characterized by a surface retention time τ s≈ 1 s, for H/D flux incident on graphite, is determined. Stronger, saturable pumping observed after helium-discharge conditioning is also described. The importance of these pumping mechanisms for control of density and its profile, and for optimization of Q dt in JET, is discussed.
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