On December 5, 2022, the National Ignition Facility achieved fusion ignition for the first time in history — producing 3.15 MJ of fusion energy from 2.05 MJ of laser input, a gain of 1.54.
ReviewedLast reviewed: 9 Aug 2026·Category: History & Milestones
The Shot
On December 5, 2022, the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory fired its 192 laser beams at a 2-mm hohlraum containing a deuterium-tritium fuel capsule. The resulting implosion produced 3.15 MJ of fusion energy from 2.05 MJ of laser energy delivered to the target — the first time in history that a fusion experiment produced more energy from fusion than the energy used to initiate it.[1]
Scientific significance: This result — a target gain of ~1.54 — confirmed the fundamental physics of inertial confinement fusion ignition, a goal pursued since the 1960s. It validated decades of theoretical and computational work on capsule implosion dynamics and demonstrated that laboratory-scale fusion ignition is achievable.
Context
The result was preceded by a 1.35 MJ shot in August 2021 that came close to breakeven. Subsequent shots in 2023 reproduced and exceeded the December 2022 result, with a July 2024 shot reaching 5.2 MJ. However, the overall system gain remains very low: NIF’s lasers require ~300 MJ of electricity to produce 2 MJ of laser light.[2]
Implications
While NIF’s primary mission is nuclear weapons stewardship rather than energy production, the ignition milestone energized the global fusion community and attracted significant new investment in both public and private fusion programs.[3]
Sources
Abu-Shawareb, H. et al. "Lawson criterion for ignition exceeded in an inertial fusion experiment." Physical Review Letters, 129, 075001, 2024.
Zylstra, A.B. et al. "Burning plasma achieved in inertial fusion." Nature, 601, 542–548, 2022.
National Ignition Facility. "NIF achieves fusion ignition." LLNL press release, December 13, 2022.