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Benchmark Verification of the Aleph PIC-DSMC Program

Aleph is a general-purpose kinetic plasma program well suited for simulating low temperature gas and plasma dynamics. Aleph implements the Particle-in-Cell and Direct Simulation Monte Carlo methods for use on 3D unstructured grids and highly parallel computing resources. Aleph is demonstrated to be well suited to evaluate new algorithms and physical models and to perform physically accurate simulations of computationally demanding applications. Here, a series of benchmark problems is performed in Aleph to verify fundamental capabilities, including self-consistent electrostatic field solve, particle transport, and energy transfer through collisions. Alongside the discussion of Aleph's performance on these benchmark problems is a discussion of the quality of the benchmark problems themselves. The results presented suggest that improvements and extensions to current/additional benchmark problems would benefit existing and future codes/algorithms thereby enabling additional verification (e.g. code-to-code) activities.