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A stellarator is a magnetic confinement device. The [[Magnetic shear|rotational transform]] is predominantly generated by external coils - as opposed to a [[Tokamak|tokamak]], in which the poloidal field is generated by plasma currents. Hybrid concepts employ both external coils and self-generated ([[Bootstrap current|bootstrap]]) currents (e.g. NCSX). | A stellarator is a magnetic confinement device. The [[Magnetic shear|rotational transform]] is predominantly generated by external coils - as opposed to a [[Tokamak|tokamak]], in which the poloidal field is generated by plasma currents. Hybrid concepts (including the concepts known as quasi-axisymmetry and quasi-omnigeneity) employ both external coils and self-generated ([[Bootstrap current|bootstrap]]) currents (e.g. NCSX). | ||
[[File:NCSX_plasmaVessel.jpg|200px|thumb|right|NCSX plasma vessel.]] | [[File:NCSX_plasmaVessel.jpg|200px|thumb|right|NCSX plasma vessel.]] |