Having a low β ["beta"] and, therefore, low power density, compared to other devices designed for the same end, modern ones are coupled to outside power via neutral beam injectors as the transformer-driven current does not provide sufficient heating.
With regard to this, Freidberg notes that the field ratio is on the order of the inverse aspect ratio while the kink safety factor is on the order of 1 in the namesake expansion for the ohmically heated variety. Having a low β ["beta"] and, therefore, low power density, compared to other devices designed for the same end, modern ones are coupled to outside power via neutral beam injectors as the transformer-driven current does not provide sufficient heating. The use of a divertor in these reactors can extend the confinement time, bringing the Lawson criterion closer to realization. For ten points, name these staple devices of the fusion program: large, toroidal, magnetic plasma confinement devices first proposed by Artsimovich and exemplified by JET and ITER.
With regard to this, Freidberg notes that the field ratio is on the order of the inverse aspect ratio while the kink safety factor is on the order of 1 in the namesake expansion for the ohmically heated variety.
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