By KiddieDaily Editors · 2026-06-29 · 2 min read · 1 source

A potential hindrance to fusion power may help instead

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(See our AI policy here .) Good news for fusion fans: A phenomenon that might have hindered efforts to generate energy using nuclear fusion may actually be beneficial. In computer simulations of two planned fusion reactors, energetic products of fusion called alpha particles helped dissipate small-scale turbulence, tiny eddies of particles that otherwise would have sapped heat from the center of the reactor, degrading its performance. The result, reported in a paper submitted May 11 to arXiv.org, adds to a growing body of research suggesting that alpha particles will affect turbulence in ways that boost reactor performance rather than worsen it, as had previously been feared.

Fusion is the process that powers the sun: Two atomic nuclei merge into one, releasing energy. If it could be harnessed on Earth, fusion could generate energy without the carbon emissions of fossil fuels or the long-lived radioactive waste produced by nuclear reactors based on fission, the splitting of atomic nuclei. Several companies are working to build commercially viable fusion reactors.

Interest in the technology is surging: On June 9, the U.S. Department of Energy released a roadmap for fusion power in the coming decade. But no reactor has yet generated the conditions under which fusion can flourish, and uncertainties swirl around the physics.One of those uncertainties involves alpha particles themselves.

In fusion reactors, magnetic fields keep a cloud of charged particles, called plasma, confined in a tight, superhot bundle. Within that plasma, hydrogen nuclei fuse to produce alpha particles — positively charged helium nuclei. Maintaining the plasma’s confinement is crucial for fusion, but it wasn’t clear whether the alpha particles would help or hurt.The idea that alpha particles could regulate turbulence and improve fusion performance has been envisioned for a long time, but without clear evidence.

Now, experiments and simulations are making this process clearer, says plasma physicist William Heidbrink of the University of California, Irvine, who was not involved in the research. “Maybe this thing, which seems sort of magical and fanciful, could really work positively.” Alpha particles are key players in fusion reactors. They carry energy that gets dumped into the surrounding plasma, heating it.

Once a reactor really gets going, it should become self-sustaining: The alpha particles produced by the fusion reactions heat the plasma, keeping conditions ripe for more fusion. “If you don’t know how the alphas will behave, there is no way to make an economically viable reactor,” says plasma physicist Jacobo Varela of the University of Texas at Austin, who was not involved with the research. “In a reactor, everything is about the alphas and how they behave.”

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