Abstract
Collision processes of atomic and molecular hydrogen in fusion plasmas and their cross-section data status are discussed in the context of neutral hydrogen beam plasma heating, divertor plasma cooling, and power and particle exhaust, as well as core and edge plasma diagnostics. Special attention is devoted to the processes involving excited (electronically and vibrationally) states of hydrogenic species. A complete kinetic scheme for a coupled H/H 2 collisional-radiative model of fusion edge/divertor plasma is presented. The status of corresponding collision database is discussed in detail, and its major gaps identified. The directions of further developments of this database are outlined.
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