RERUN: The Clean Energy Potential of Nuclear Fusion, with Annie Kritcher

Climate Break

What is nuclear fusion?

Nuclear fusion produces energy by fusing atoms together. Atomic cores (nuclei) merge together to form a heavier—though unstable—nucleus, releasing mass to regain stability. This mass release corresponds to an energy release, given Einstein’s equation E=mc2, which says in part that mass and energy can be converted into each other. The sun, along with all other stars, uses nuclear fusion to generate energy, which is released as heat and light.

The 2022 Fusion Breakthrough

In late 2022, scientists led by Dr. Annie Kritcher at the Lawrence Livermore National Laboratory (LLNL) briefly replicated the power of the sun. Replicating the sun’s power requires replicating the extreme heat and density conditions within the sun’s core. Atomic cores are positively charged, meaning they repel each other. To overcome this barrier, scientists need to apply massive amounts of heat and keep atomic cores extremely close together. For the first time, scientists produced more energy from fusion than the amount of energy it took to maintain these conditions.

Fusion is a greenhouse-gas-free source of potentially unlimited electricity, powered by hydrogen we can take from water, and creating no long-lived radioactive waste. According to the International Atomic Energy Agency, fusion generates four times more energy per kilogram than the fission used for powering nuclear plants, and nearly 4 million times more energy than burning fossil fuels for energy.

What’s Next?

Commercial nuclear fusion is still a long way off. While the physics aspect of fusion is “solved,” fusion remains a complicated engineering problem. The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory has the most powerful laser in the world to blast heat at atoms, but it is the size of three football stadiums, very old, slow, inefficient, and clunky. There are still unanswered questions, such as how to affordably capture fusion energy, and how to keep a fusion reaction going for a long period of time. And although the laser shots at the NIF were weaker than its fusion output, the amount of energy drawn from the grid to create those lasers is 120 times more than the fusion output generated at LLNL.

About Dr. Annie Kritcher

Dr. Annie Kritcher is a nuclear engineer and physicist at the National Ignition Facility at Lawrence Livermore National Laboratory Weapons and Complex Integration's Design Physics Division. She led the recent nuclear fusion breakthrough at LLNL. In 2022, Kritcher was elected fellow of the American Physical Society. She earned her PhD at UC Berkeley.

Further Reading

A shot for the ages: Fusion ignition breakthrough hailed as ‘one of the most impressive scientific feats of the 21st century’ | Lawrence Livermore National Laboratory

UK Power Grid Could Have First Commercial Fusion Reactor By 2030s

World's largest nuclear fusion reactor promises clean energy, but the challenges are huge - ABC News

Annie Kritcher leads revolutionary nuclear fusion experiment

IAEA, What is nuclear fusion?
NOVA Now Universe Revealed Podcast, Can We Recreate the Power of Stars Down on Earth? (YouTube or NOVA Podcast website)

For a transcript, please visit https://climatebreak.org/the-clean-energy-potential-of-nuclear-fusion-with-annie-kritcher/