The theory of plasma confinement by non-axisymmetric magnetic fields is reviewed. Such
fields are used to confine fusion plasmas in stellarators, where in contrast to tokamaks and …

The two leading concepts for confining high-temperature fusion plasmas are the tokamak
and the stellarator. Tokamaks are rotationally symmetric and use a large plasma current to …

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

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 …

Quasi-symmetry can greatly improve the confinement of energetic particles and thermal
plasma in a stellarator. The magnetic field of a quasi-symmetric stellarator at high plasma …

An overview is given of physics differences between stellarators and tokamaks, including
magnetohydrodynamic equilibrium, stability, fast-ion physics, plasma rotation, neoclassical …

The physics of non-axisymmetry is a far more important topic in the theory of toroidal fusion
plasmas than might be expected.(1) Even a small toroidal asymmetry in the magnetic field …

Stellarator magnetic configurations need to be optimized in order to meet all the required
properties of a fusion reactor. In this work, it is shown that a flat-mirror quasi-isodynamic (QI) …

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 …

The confinement of the guiding-centre trajectories in a stellarator is determined by the
variation of the magnetic field strength contours. Our calculation in contrast does not use the …