Lawson criterion

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Summary

The Lawson criterion is a figure of merit used in nuclear fusion research.

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Originator of the Lawson criterion
John D. Lawson was the British physicist who published the seminal 1955 paper defining the conditions necessary for a practical fusion reactor.
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State of matter analyzed by the Lawson criterion
The Lawson criterion is specifically applied to plasma, as it describes the conditions required for the ions within the plasma to overcome the Coulomb barrier and fuse.
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Fundamental process governed by the Lawson criterion
The Lawson criterion provides the specific physical requirements necessary to achieve a self-sustaining nuclear fusion reaction.
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defines ignition requirements
The Lawson criterion specifies the minimum conditions of temperature, density, and confinement time required for a D-T plasma to reach self-sustaining ignition.
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Physical state defined by the Lawson criterion
The Lawson criterion identifies the threshold at which a fusion reaction becomes self-sustaining, meaning the energy produced by fusion products is sufficient to maintain the plasma temperature without external heating.
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Large-scale project aiming to exceed the Lawson criterion
ITER is an international research project designed to demonstrate the feasibility of fusion power by achieving a plasma state that significantly exceeds the Lawson criterion thresholds.
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Physical obstacle overcome by meeting the Lawson criterion
The Lawson criterion defines the conditions under which particles have enough kinetic energy to overcome the Coulomb barrier, allowing the strong nuclear force to initiate fusion.
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performance benchmark for tokamak fusion reactors
The Lawson criterion defines the necessary conditions of temperature, density, and confinement time for a tokamak to achieve net energy gain.
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Fundamental requirement for net energy gain
This criterion defines the minimum conditions of plasma density, temperature, and confinement time required for a fusion reactor to achieve ignition.
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Application domain for the Lawson criterion
Magnetic confinement fusion, such as in tokamaks, uses the Lawson criterion to determine the necessary magnetic field strength and plasma density to achieve sustained fusion.
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Lower bound threshold related to the Lawson criterion
Breakeven is the point where fusion power output equals the power input required to heat the plasma, a less stringent condition than ignition but a major milestone in fusion research.
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Alternative fusion approach evaluated via the Lawson criterion
Inertial confinement fusion attempts to satisfy the Lawson criterion by rapidly compressing fuel pellets to extreme densities, rather than using magnetic fields.
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Energy loss mechanism affecting the Lawson criterion
Bremsstrahlung radiation is a primary energy loss mechanism in fusion plasmas that must be accounted for when calculating the minimum requirements for the Lawson criterion.
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