A Collaborative National Center for Fusion & Plasma Research

Magnetic Divertor for Low Plasma Recycling in Tokamaks Ernesto Mazzucato

Existing experiments indicate that low recycling of exhausted particles can improve the energy confinement in tokamaks, very likely by preventing the cooling of the plasma edge and thereby causing a reduction in the level of plasma turbulence. This can reduce the size of a tokamak fusion reactor, making the latter a more viable source of energy. The necessary conditions for low recycling can be achieved with the use of a new magnetic divertor, where the exhausted particles are injected through a narrow aperture into a large chamber. Exhausting the particles into a large chamber prevents their return to the plasma, resulting in a reduction in plasma recycling to a level where existing experiments have shown a large enhancement in plasma confinement. Other benefits of the proposed divertor are better efficiency of fusion power production, improved plasma stability and lower level of impurities.


U.S. Department of Energy
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