A new quasi-isodynamic (QI) stellarator configuration optimized for the confinement of
energetic ions at low plasma β is obtained. The numerical optimization is carried out using …

We present a novel method for numerically finding quasi-isodynamic stellarator magnetic
fields with excellent fast-particle confinement and extremely small neoclassical transport …

The separation between the last closed flux surface of a plasma and the external coils that
magnetically confine it is a limiting factor in the construction of fusion-capable plasma …

A method is demonstrated to rapidly calculate the shapes and properties of quasi-
axisymmetric and quasi-helically symmetric stellarators. In this approach, optimization is …

A simplified view of the space of optimised stellarators has the potential to guide and aid the
design efforts of magnetic confinement configurations suitable for future fusion reactors. We …

In omnigenous magnetic fields, charged particles are perfectly confined in the absence of
collisions and turbulence. For this reason, the magnetic configuration is optimized to be …

We develop the formalism of the first-order near-axis expansion of the
magnetohydrodynamic equilibrium equations described by Garren & Boozer (Phys. Fluids B …

The maximum-J property in quasi-isodynamic stellarators Page 1 J. Plasma Phys. (2024),
vol. 90, 905900212 © The Author(s), 2024. Published by Cambridge University Press 1 This …

Excerpt This book project arose out of the collaboration on Hidden Symmetries and Fusion
Energy1 funded by the Simons Foundation, initially between 2018 and 2022 and then for a …

The condition of quasi-isodynamicity is derived to second order in the distance from the
magnetic axis. We do so using a formulation of omnigenity that explicitly requires the …