Parts | Days | Selection | Search | Updates | Downloads | Help

P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.26: Poster

Tuesday, April 1, 2025, 16:15–18:15, ZHG Foyer 1. OG

Study of Quasi-Symmetry in Stellarator Designs: Impact of Coil Parameters on Device Robustness — •Elisa Buglione-Ceresa, Pedro Gil, and Eve Stenson — Max Planck Institute for Plasma Physics, Garching

This study investigates the role of quasi-symmetry (QS) in stellarators, focusing on its sensitivity to various design parameters. QS is crucial for confining trapped charged particles and plasma in toroidal magnetic fields. In a quasi-symmetric stellarator the magnetic field strength can exhibit symmetry along a specific coordinate, providing the confinement of guiding center trajectories. The research examines three stellarator configurations, analyzing the impact of coil number, coil separation, coil complexity (λ), and manufacturing imperfections (simulated as Gaussian perturbations with amplitude σ and characteristic length L) on QS. The studied equilibria include the APEX-EPOS configuration and reactor-sized designs with quasiaxisymmetry and quasihelical symmetry for precise plasma confinement. Using REGCOIL for coil design optimization and SIMSOPT for perturbations, we applied Gaussian perturbations to simulate realistic manufacturing conditions. Results show that QS decreases with increasing perturbations, highlighting its sensitivity to manufacturing tolerances. This study also investigates how QS changes with varying coil numbers, separation, and complexity. These findings provide critical insights into optimizing coil design, including performance of the field accuracy at reactor relevant dimensions, offering valuable guidelines for designing stellarators that balance high performance with practical feasibility.

Keywords: Stellarator