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Detailed numerical studies of the ablation of a single neon pellet in theplasma disruption mitigation parameter space have been performed. Simulationswere carried out using FronTier, a hydrodynamic and low magnetic Reynoldsnumber MHD code with explicit tracking of material interfaces. FronTier'sphysics models resolve the pellet surface ablation and the formation of adense, cold cloud of ablated material, the deposition of energy from hot plasmaelectrons passing through the ablation cloud, expansion of the ablation cloudalong magnetic field lines and the radiation losses. A local thermodynamicequilibrium model based on Saha equations has been used to resolve atomicprocesses in the cloud and Redlich-Kwong corrections to the ideal gas equationof state for cold and dense gases have been used near the pellet surface. TheFronTier pellet code is the next generation of the code described in [R.Samulyak, T. Lu, P. Parks, Nuclear Fusion, (47) 2007, 103--118]. It has beenvalidated against the semi-analytic improved Neutral Gas Shielding model in the1D spherically symmetric approximation. Main results include quantification ofthe influence of atomic processes and Redlich-Kwong corrections on the pelletablation in spherically symmetric approximation and verification of analyticscaling laws in a broad range of pellet and plasma parameters. Using axiallysymmetric MHD simulations, properties of ablation channels and the reduction ofpellet ablation rates in magnetic fields of increasing strength have beenstudied. While the main emphasis has been given to neon pellets for the plasmadisruption mitigation, selected results on deuterium fueling pellets have alsobeen presented.

Near-field simulations of pellet ablation for disruptions mitigation in tokamaks