US researchers announced a historic nuclear fusion breakthrough on Tuesday, hailing a "landmark achievement" in the quest for a source of unlimited, clean power and an end to reliance on fossil fuels.

The Lawrence Livermore National Laboratory (LLNL) in California said an experiment it conducted this month "produced more energy from fusion than the laser energy used to drive it."

The US Department of Energy described the achievement of fusion ignition as a "major scientific breakthrough" that will lead to "advancements in national defense and the future of clean power."

LLNL director Kim Budil described it as "is one of the most significant scientific challenges ever tackled by humanity."

Scientists have been working for decades to develop nuclear fusion -- touted by its supporters as a clean, abundant and safe source of energy that could eventually allow humanity to break its dependence on the fossil fuels driving a global climate crisis.

The LLNL said a team at its National Ignition Facility (NIF) conducted the first controlled fusion experiment in history on December 5, achieving what is known as "scientific energy breakeven."

"This is a landmark achievement for the researchers and staff at the National Ignition Facility who have dedicated their careers to seeing fusion ignition become a reality, and this milestone will undoubtedly spark even more discovery," US Secretary of Energy Jennifer Granholm said.

- More developments needed -

Nuclear power plants around the world currently use fission -- the splitting of a heavy atom's nucleus -- to produce energy.

Fusion on the other hand combines two light hydrogen atoms to form one heavier helium atom, releasing a large amount of energy in the process.

That's the process that occurs inside stars, including our sun.

On Earth, fusion reactions can be provoked by heating hydrogen to extreme temperatures inside specialized devices.

Researchers at the LLNL use the massive National Ignition Facility -- 192 ultra-powerful lasers all pointed into a thimble-sized cylinder filled with hydrogen.

Like fission, fusion is carbon-free during operation, but has many more advantages: it poses no risk of nuclear disaster and produces much less radioactive waste.

However, there is still a long way to go before fusion is viable on an industrial scale.

"Many advanced science and technology developments are still needed to achieve simple, affordable IFE to power homes and businesses," LLNL said.

Other nuclear fusion projects are also in development around the world, including the major international project known as ITER, which is currently under construction in France.

Instead of lasers, ITER will use a technique known as magnetic confinement, containing a swirling mass of fusing hydrogen plasma within a massive donut-shaped chamber.

Nuclear fusion: harnessing the power of the stars
Washington (AFP) Dec 13, 2022 - The US Department of Energy's nuclear fusion laboratory says there will be a "major scientific breakthrough" announced Tuesday, as media report that scientists have finally surpassed an important milestone for the technology: getting more energy out than was put in.

The announcement has the scientific community abuzz, as nuclear fusion is considered by some to be the energy of the future, particularly as it produces no greenhouse gases, leaves little waste and has no risk of nuclear accidents.

Here is an update on how nuclear fusion works, what projects are underway and estimates on when they could be completed:

- Energy of the stars -

Fusion differs from fission, the technique currently used in nuclear power plants, by fusing two atomic nuclei instead of splitting one.

In fact, fusion is the process that powers the sun.

Two light hydrogen atoms, when they collide at very high speeds, fuse together into one heavier element, helium, releasing energy in the process.

"Controlling the power source of the stars is the greatest technological challenge humanity has ever undertaken," tweeted physicist Arthur Turrell, author of "The Star Builders."

- Two distinct methods -

Producing fusion reactions on Earth is only possible by heating matter to extremely high temperatures -- over 100 million degrees Celsius (180 million Fahrenheit).

"So we have to find ways to isolate this extremely hot matter from anything that could cool it down. This is the problem of containment," Erik Lefebvre, project leader at the French Atomic Energy Commission (CEA), told AFP.

One method is to "confine" the fusion reaction with magnets.

In a huge donut-shaped reactor, light hydrogen isotopes (deuterium and tritium) are heated until they reach the state of plasma, a very low density gas.

Magnets confine the swirling plasma gas, preventing it from coming into contact with the chamber's walls, while the atoms collide and begin fusing.

This is the type of reactor used in the major international project known as ITER, currently under construction in France, as well as the Joint European Torus (JET) near Oxford, England.

A second method is inertial confinement fusion, in which high energy lasers are directed simultaneously into a thimble-sized cylinder containing the hydrogen.

This technique is used by the French Megajoule Laser (LMJ), and the world's most advanced fusion project, the California-based National Ignition Facility (NIF).

Inertial confinement is used to demonstrate the physical principles of fusion, while magnetic confinement seeks to mimic future industrial-scale reactors.

- State of research -

For decades, scientists have attempted to achieve what is known as "net energy gain" -- that is, more energy is produced by the fusion reaction than it takes to activate it.

According to reports by the Financial Times and the Washington Post, that will be the "major scientific breakthrough" announced Tuesday by the NIF.

But Lefebvre cautions that "the road is still very long" before "a demonstration on an industrial scale that is commercially viable."

He says such a project will take another 20 or 30 years to be completed.

To get there, researchers must first increase the efficiency of the lasers and reproduce the experiment more frequently.

- Fusion's benefits -

The NIF's reported success has sparked great excitement in the scientific community, which is hoping the technology could be a game-changer for global energy production.

Unlike fission, fusion carries no risk of nuclear accidents.

"If a few lasers are missing and they don't go off at the right time, or if the confinement of the plasma by the magnetic field... is not perfect," the reaction will simply stop, Lefebvre says.

Nuclear fusion also produces much less radioactive waste than current power plants, and above all, emits no greenhouse gases.

"It is an energy source that is totally carbon-free, generates very little waste, and is intrinsically extremely safe," according to Lefebvre, who says fusion could be "a future solution for the world's energy problems."

Regardless of Tuesday's announcement, however, the technology is still a far way off from producing energy on an industrial scale, and cannot therefore be relied on as an immediate solution to the climate crisis.

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US announces nuclear fusion breakthrough
Washington (AFP) Dec 13, 2022
The US Department of Energy said Sunday it would announce a "major scientific breakthrough" this week, after media reported a federal laboratory had recently achieved a major milestone in nuclear fusion research. The Financial Times reported Sunday that scientists in the California-based Lawrence Livermore National Laboratory (LLNL) had achieved a "net energy gain" from an experimental fusion reactor. That would represent the first time that researchers have successfully produced more energy in ... read more

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