Lawson criterion

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A condition for the release of energy from a thermonuclear reactor first laid down by J. D. Lawson in 1957. It is usually stated as the minimum value for the product of the density (nG) of the fusion-fuel particles and the containment time (τ) for energy breakeven, i.e. it is a measure of the density of the reacting particles required and the time for which they need to react in order to produce more energy than was used in raising the temperature of the reacting particles to the ignition temperature. For a 50:50 mixture of deuterium and tritium at the ignition temperature, the value of nGτ is between 1014 and 1015 cm−3 s.

Subjects: Physics.

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