Abstract
AbstractA one‐dimensional (1‐D) model of neutral transport in edge plasmas is shown to reproduce the results of Monte Carlo simulations for a variety of edge plasma profiles. The transport of hydrogenic atoms is assumed to be diffusive with a flux limit that depends on the neutral mean‐free path and gradients of plasma density and ion temperature. The steady‐state continuity equation and a simple first order equation for the energy transfer between ions and neutral atoms are solved for the neutral atom density and temperature along the normal to the recycling (source) surface. Based upon particle and energy reflection coefficients for carbon, recycling is simulated with fluxes of both energetic reflected atoms and desorbed molecules. Assuming convective transport with constant velocity, the continuity equation for molecules is solved for the molecular density, which is shown to agree with Monte Carlo if flux enhancement due to backscattered atoms is included. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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