Tokamak vs Stellarator - Candidates for Fusion Power

Tokamak device (left) and Stellarator device (right)
Tokamak magnetic field and current. Shown is the toroidal field and the coils (blue) that produce it, the plasma current (red) and the poloidal field creates by it, and the resulting twisted field when these are overlaid. By http://www.fusionscience.org/technical/ASslides/ASslides.html, Public Domain, Link	Example of a stellarator design, as used in the Wendelstein 7-X experiment: A series of magnet coils (blue) surrounds the plasma (yellow). A magnetic field line is highlighted in green on the yellow plasma surface. By Max-Planck Institut für Plasmaphysik - Max-Planck Institut für Plasmaphysik, CC BY 3.0, Link