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Above a threshold heating power the edge turbulence suddenly drops and an insulating layer forms (H-mode), but what triggers this, how dense the plasma may become and how the fuel mass changes the heat leakage are not understood.","title":"Tokamak turbulence, L-H transition and density limit","topic_ref":null,"why":"Confinement quality and the density limit set the size, cost and fusion power of a tokamak power 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