SMRTR Science & EngineeringApr 16, 2026Interesting Engineering

US tests spin-polarized fuel in 180-million-degree Fahrenheit tokamaks for fusion power

SMRTR summary

US scientists are testing spin-polarized nuclear fuel in tokamaks at 180 million degrees Fahrenheit, aligning particle spins to potentially increase fusion reaction rates by 50% and energy output by 80%. The experiments use deuterium and helium-3 instead of scarce tritium, with final tests expected by 2030 that could enable smaller, more efficient fusion reactors.

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