  The stellarator is a type of fusion energy device that - if properly designed
- could provide clean, safe, and abundant energy to the grid. To generate this
energy, a stellarator must keep a hot mixture of charged particles (known as a
plasma) sufficiently confined by using a fully shaped magnetic field. If this
is achieved, the heat from fusion reactions within the plasma can be harvested
as energy. We present a novel method for designing reactor-relevant stellarator
magnetic fields, which combine several key physical properties. These include
plasma stability, excellent confinement of the fast moving particles generated
by fusion reactions, and reduction of the turbulence that is known to limit the
performance of the most advanced stellarator experiment in the world,
Wendelstein 7-X.
