ACCELERATION TECHNIQUES FOR DIRECT USE OF CAD-BASED GEOMETRIES IN MONTE CARLO RADIATION TRANSPORT

The Direct Accelerated Geometry for Monte Carlo (DAGMC) software library makes use of a variety of acceleration techniques in order to accomplish efficient ray tracing directly on CADbased solid models, without translation to the native Monte Carlo applications input language. These techniques include high-fidelity faceting combined with hierarchical trees of oriented bounding boxes for those facets. The resulting methods are both efficient and enable the modeling of very complex geometries including those with high-order surfaces. This work describes the acceleration techniques and provides examples of detailed simulations that demonstrate capabilities and performance.