Abstract Details
Abstracts
Author: Elizabeth Paul
Requested Type: Poster
Submitted: 2025-03-14 08:29:37
Co-authors: Abdullah Hyder, Eduardo Rodríguez, Rogério Jorge, Alexey Knyazev
Contact Info:
Columbia University
200 S.W. Mudd, MC4701
New York, New York 10027
USA
Abstract Text:
The shear Alfvén wave (SAW) continuum plays a critical role in the stability of energetic particle-driven Alfvén eigenmodes. We develop a theoretical framework to analyze the SAW continuum in three-dimensional quasisymmetric magnetic fields, focusing on its implications for stellarator design. By employing a near-axis model and degenerate perturbation theory, the continuum equation is solved, highlighting unique features in 3D configurations, such as the interactions between spectral gaps. Numerical examples validate the theory, demonstrating the impact of flux surface shaping and quasisymmetric field properties on continuum structure. The results provide insights into optimizing stellarator configurations to minimize resonance-driven losses of energetic particles. This work establishes a basis for incorporating Alfvénic stability considerations into the stellarator design process, demonstrated through optimization of a quasihelical configuration to avoid high-frequency spectral gaps.
Characterization: 4.0
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