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Question
Why a spherical tokamak for the breeder?
It holds more plasma pressure per tesla — the route to a compact neutron source.
Why a spherical tokamak for the breeder?
A spherical tokamak's low aspect ratio (A = 2.5) lets it hold high plasma pressure (βN = 1.532) for a given field, making a compact, economical machine. Since the breeder's job is to be a dense neutron and tritium source, that compactness is exactly what it needs.
The trade is a tight central column, which Kronos treats as a named design focus.