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A stellarator is a toroidal device used in physics to achieve controlled nuclear fusion. It works by confining and heating a gaseous plasma using an externally applied magnetic field. Unlike tokamaks, which rely on a plasma current to generate part of their magnetic field, stellarators generate their magnetic field solely through external coils. This means they do not require a plasma current, thus avoiding the engineering challenges associated with sustaining a large plasma current. Stellarators are one of several magnetic confinement concepts being developed for fusion reactors.12

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