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Topic: Small Tight Aspect Ratio Tokamak

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In the News (Sun 17 Feb 19)

 Spherical Tokamak advantages
The START (Small Tight Aspect Ratio Tokamak) experiment at Culham provided the world's first experimental results on hot spherical tokamak plasmas, achieving electron temperatures of more than 10 million °C. Keeping the plasma stable is vital for the efficiency of a fusion machine.
A spherical tokamak or ST (sometimes called spherical torus) has a much tighter ring shape, more like a cored apple (illustrated by the inner shape in the figure).
The toroidal magnetic field (supplied by the current flowing in the central column) needed to keep the plasma stable can be a factor of 10 less in a spherical tokamak than that of a conventional tokamak carrying the same plasma current. /st/advantages.html   (352 words)

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