Speaker
Description
We have developed a new full-orbit module for energetic particle simulations within a hybrid kinetic-MHD code, MEGA, incorporating the Boris method to enhance accuracy and stability in particle trajectory calculations. The evolution of the energetic particle distribution function was calculated using the δf method in guiding-center coordinates, facilitated by a transformation based on Littlejohn’s formalism. Linear simulations of Toroidal Alfvén Eigenmodes (TAE) in MEGA followed a benchmark setup, comparing guiding-center approximation (GCA), finite Larmor radius (FLR) effects, and full-orbit modeling (FOM). Results indicated that FLR and FOM significantly reduced mode growth rates while maintaining consistent mode frequencies. Radial mode structures localized near rational surfaces showed strong agreement between FOM and GCA cases. Particle analysis of top energetic particles with high |δf| values revealed consistent resonance characteristics across cases, supporting the reliability of the full-orbit module.
| Presentation type | Poster |
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