Modeling of Neutral Hydrogen Velocities in the Tokamak Fusion Test Reactor
Authors: D. P. Stotler, C. H. Skinner, R. V. Budny, et al
Monte Carlo neutral transport simulations of hydrogen velocities in the Tokamak Fusion Test Reactor (TFTR) [K. M. McGuire et al., Phys. Plasmas 2, 2176 (1995)] are compared with experiment using the Doppler-broadened Balmer-a spectral line profile. Good agreement is obtained under a range of conditions, validating the treatment of charge exchange, molecular dissociation, surface reflection, and sputtering in the neutral gas code DEGAS. A residual deficiency of 10-100 eV neutrals in most of the simulations indicates that further study of the energetics of H+ 2 dissociation for electron energies in excess of 100 eV is needed.