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Single carbon pellet disruption mitigation simulations using M3D-C1 wereconducted in an NSTX-U-like plasma to support the electromagnetic pelletinjection concept (EPI). A carbon ablation model has been implemented in M3D-C1and tested with available data. 2D simulations were conducted in order toestimate the amount of carbon needed to quench the plasma, finding that thecontent in a $1\,$mm radius vitreous carbon pellet (~ 3.2x10E20 atoms) would beenough if it is entirely ablated. 3D simulations were performed, scanning overpellet velocity and parallel thermal conductivity, as well as differentinjection directions and pellet concepts (solid pellets and shell pellets). Thesensitivity of the thermal quench and other related quantities to theseparameters has been evaluated. A 1 mm radius solid pellet only partiallyablates at velocities of 300 m/s or higher, thus being unable to fully quenchthe plasma. To further enhance the ablation, approximations to an array ofpellets and the shell pellet concept were also explored. 3D field linestochastization plays an important role in both quenching the center of theplasma and in heat flux losses, thus lowering the amount of carbon needed tomitigate the plasma when compared to the 2D case. This study constitutes animportant step forward in `predict-first' simulations for disruption mitigationin NSTX-U and other devices, such as ITER.

Modeling of carbon pellets disruption mitigation in an NSTX-U plasma