Abstract
It is shown that the magnetic-field coils of a stellarator can, at least in principle, be substantially simplified by the use of permanent magnets. Such magnets cannot create toroidal magnetic flux, but they can be used to shape the plasma and thus to create poloidal flux and rotational transform, thereby easing the requirements on the magnetic-field coils. As an example, a quasiaxisymmetric stellarator configuration is constructed with only 8 circular coils (all identical) and permanent magnets.
Highlights
Stellarators, tokamaks, and other devices for fusion plasma confinement use electromagnets to create the magnetic field
In the present Letter, we suggest that permanent magnets could be used to shape the plasma and drastically simplify the coils
Our emphasis is on mathematical aspects of this problem whereas other issues will be discussed in subsequent papers. These issues include properties of permanent magnets and why certain types are suitable for stellarators, questions of engineering, assembly, and practical limitations
Summary
Stellarators, tokamaks, and other devices for fusion plasma confinement use electromagnets to create the magnetic field. On another toroidal surface ∂D, at some distance from the plasma, that creates a magnetic field tangential to ∂P. (This problem is ill posed but can be regularized in a number of ways, for instance, by adding a term proportional to jKj2 to the integrand [4].) In conventional stellarator design, the surface current K found is subsequently discretized into suitable magnetic-field coils, but these are in general very complicated.
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