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Why is deuterium-tritium fusion a leading reaction for fusion power?
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nuclear fusion
Interior of the U.S. Department of Energy's National Ignition Facility (NIF), located at Lawrence Livermore National Laboratory, Livermore, California. The NIF target chamber uses a high-energy laser to heat fusion fuel to temperatures sufficient for thermonuclear ignition. The facility is used for basic science, fusion energy research, and nuclear weapons testing.
Deuterium-tritium (D-T) fusion is considered the leading reaction for controlled power generation for several key reasons:
- Lower Energy Requirements: Because both deuterium and tritium are hydrogen isotopes with a single unit of positive charge, they experience less electrical repulsion (the Coulomb force) than heavier, more highly charged nuclei. This allows fusion to occur at more moderate, practical plasma temperatures.12
- High Reaction Rates: The cross sections for D-T fusion are high, meaning the reaction occurs readily under the conditions achievable in experimental reactors.1
- Significant Energy Yield: The reaction releases a substantial amount of energy—approximately 17.58 MeV per reaction.1
- Fuel Sustainability: D-T reactors can be designed to be self-sustaining regarding fuel. Neutrons produced by the reaction can be captured in a lithium blanket surrounding the plasma to breed more tritium, which is then fed back into the system. With deuterium readily available from seawater and lithium being abundant, this process offers a virtually inexhaustible energy source.2