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In this 20-minute presentation, explore the fundamental properties of quasi-isodynamicity (QI) in magnetic field-plasma systems essential for thermonuclear fusion confinement. Delve into how QI stellarators, as alternatives to quasisymmetric ones, offer distinct advantages despite their greater complexity. Examine the defining characteristics of QI fields and how they influence magnetic field properties, identifying which aspects are easily achievable and which present challenges. Follow the discussion through the near-axis description framework, where many theoretical statements become rigorously true. Learn about practical applications of these concepts, including a systematic survey of QI stellarators based on recent near-axis theory advancements. Discover methods for assessing neoclassical transport and designing MHD-stable fields with minimal plasma boundary shaping. This talk by Eduardo Rodriguez is part of the Simons Collaboration on Hidden Symmetries and Fusion Energy Annual Meeting 2025.
