Application of magnetically-broadened hydrogenic line profiles to computational modeling of a plasma experiment

Magnetically-broadened hydrogenic line profiles are used, in conjunction with a non-local thermodynamic equilibrium (NLTE) code, to model an optically thick phenomenon in the Alcator C-Mod tokamak fusion experiment. The line profiles, including magnetic field effects as well as Doppler and Stark broadening, have been calculated using Beline and are used in Cretin, a multi-dimensional NLTE radiation transfer code, to study the influence of a magnetic field on emergent spectrum. A midplane Alcator C-Mod multifaceted axisymmetric radiation from the edge (MARFE), in which the magnetic field strength was changed dynamically from 5.4 T down to 2.7 T, is simulated and compared with experimental data. Assuming hydrodynamic and radiative equilibrium, MARFE simulations are performed in one-dimension with fixed plasma density and temperature profiles. Magnetic broadening effects on the brightness of optically thick Lyman series lines are quantified. (C) 2001 Elsevier Science Ltd. All rights reserved.