Validation of Ray-Based Cross-Beam Energy Transfer Algorithms

Ray-based cross-beam energy transfer (CBET) models have become a common feature of the radiation-hydrodynamic codes used to simulate inertial confinement fusion experiments. These models are necessary for achieving better agreement with experimental measurements, but their detailed implementation can vary widely between codes and often rely on artificial multipliers. The reliance on multipliers makes it difficult to determine whether the model or code is missing physics or if there is a flaw in the implementation. To address this, a series of 2-D and 3-D test cases have been developed with validated solutions from wave-based calculations. Comparisons of various ray-based CBET models to the wave-based calculations highlight the essential physics that is required for accurate ray-based CBET modeling.