Modeling of Alcator C-Mod divertor baffling experiments

[摘要] A specific Alcator C-Mod discharge from the series of divertor baffling experiments is simulated with the DEGAS2 Monte Carlo neutral transport code. A simple two-point plasma model is used to describe the plasma Variation between Langmuir probe locations. A range of conductances for the bypass between the divertor plenum and the main chamber are considered. The experimentally observed insensitivity of the neutral current flowing through the bypass and of the D-alpha emissions to the magnitude of the conductance is reproduced. The current of atoms in this regime is being limited by atomic physics processes and not bypass conductance. The simulated trends in divertor pressure, bypass current, and D-alpha emission agree only qualitatively with the experimental measurements, however. Possible explanations for the quantitative differences are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

[发布日期] 2001-03-01

[效力级别]  Proceedings Paper

[关键词] Alcator C-Mod;DEGAS code;neutral gas modeling