Speakers
Description
This work presents advanced Particle-in-Cell (PIC) simulations using WarpX to study the physics of neutral beam injection (NBI) in WAHM-class beamlines as part of a DOE INFUSE collaboration between Realta Fusion and Lawrence Berkeley National Laboratory (LBNL). We first validate the WarpX framework by modeling the detailed beam dynamics of a positive-ion WAHM NBI system, demonstrating accurate reproduction of beam transport, space-charge effects, and neutralization processes. Building on these successful results, we extend the modeling capability to negative-ion beam systems, with a focus on photon-driven neutralization mechanisms relevant to high-efficiency negative NBI concepts. The simulations provide insight into beam–photon interaction regimes, stripping losses, and phase-space evolution under realistic beamline conditions. These results establish a predictive simulation toolchain for the design and optimization of next-generation photoneutralizers and support the development of high-performance negative-ion neutral beam technology for fusion applications.
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