Neoclassical transport is a fundamental part of stellarator scenario development, since it is expected to account for an important part of the energy losses in a stellarator reactor. Therefore, its minimization is in the core or any process of stellarator optimization and design. In a tokamak, the radial neoclassical transport is very small. The reason …

The International Stellarator/Heliotron Database, pursued under the auspices of IEA Implementing Agreement for Cooperation in Development of the Stellarator Heliotron Concept (2.10.1992), aims at contributing to bringing the stellarator line to maturity as a possible alternative to tokamaks. This is done by providing a physics-based step-ladder approach on issues deemed critical for the development of credible …

Wendelstein 7-X is an experimental stellarator device built in Greifswald, Germany, at the Max Planck Institute of Plasma Physics, and completed in October 2015. It is based on a five field-period Helias configuration. It is mainly a toroid, consisting of 50 non-planar and 20 planar superconducting magnetic coils, 3.5 m high. The 50 non-planar coils …

TJ-II is a flexible heliac installed at the National Fusion Laboratory in Spain. Its first plasma run was in 1997, and as of 2022 is still operational. It is a four period low magnetic shear stellarator with major radius R = 1.5 m, average minor radius a < 0.22 m, and magnetic field on axis …