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  Term: Scientific Breakeven
  Definition: This is one of the major performance measurements in fusion energy research. In steady-state magnetic confinement fusion, scientific breakeven means that the the fusion power produced in a plasma matches the external heating power applied to the plasma to sustain it, i.e. Pfusion/Pheating * Q * 1. This concept can be extended to inherently pulsed fusion approaches, such as inertial confinement fusion, in which case scientific breakeven can be said to occur when the fusion energy produced in the plasma matches the heating energy that was applied to the plasma. The heating power and energy are only what is actually applied to the plasma; conversion losses are typically neglected. Several other types of breakeven are commonly used; see Breakeven.

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