Near-field models and simulation of the ablation of pellets and SPI fragments for plasma disruption mitigation in tokamaks

Numerical studies of the ablation of neon pellets and shuttered pellet injection (SPI) fragments in tokamaks in the plasma disruption mitigation parameter space have been performed using a pellet ablation model based on the Lagrangian Particle (LP) code [R. Samulyak, X. Wang, H.-S. Chen, Lagrangian Particle Method for Compressible Fluid Dynamics, J. Comput. Phys., 362 (2018), 1-19]. The code implements the low magnetic Reynolds number MHD equations, kinetic models for the electronic heating, a pellet surface ablation model, equation of state with multiple ionization support, radiation and a model for grad-B drift of the ablated material across the magnetic field [P.B. Parks and L. R. Baylor, PRL 94 125002 (2005)].