Nuclear fusion record smashed as German scientists take 'a significant step forward' to near-limitless clean energy
A recently concluded experimental campaign at the Wendelstein 7-X stellarator at the Max Planck Institute for Plasma Physics (IPP) in Greifswald, Germany has smashed previous fusion records and set a new benchmark for reactor performances.
Nuclear fusion offers a tantalizing promise of unlimited clean energy. By smashing together isotopes (or different versions) of hydrogen at incredibly high temperatures, the resulting superheated plasma of electrons and ions fuses into heavier atoms, releasing a phenomenal amount of energy in the process.
However, while this fusion reaction is self-sustaining under the extraordinary temperatures and pressures within stars, recreating these conditions on Earth is a huge technical challenge — and current reactor concepts still consume more energy than they are able to produce.
Stellarators are one of the most promising reactor designs, so named for their mimicry of reactions in the sun. They use powerful external magnets to control the high-energy plasma within a ring-shaped vacuum chamber and maintain a stable, high pressure. Unlike simpler tokamak reactors — which pass a high current through the plasma to generate the required magnetic field — stellarators' external magnets are better at stabilizing the plasma through the fusion reactions, a feature that will ultimately be necessary when translating the technology to commercial power plants.
In the recent experiments, the W7-X stellarator outperformed previous benchmarks set by the decommissioned tokamak reactors JT60U in Japan and JET in the UK, especially over how long the plasma can be sustained.
Related: Nuclear fusion could be the clean energy of the future
Most notably, the international team revealed that the reactor had reached a new record high triple product — a key metric for the success of fusion power generators. The triple product is a combination of the density of particles in the plasma, the temperature required for these particles to fuse, and the energy confinement time (a measure of how well the thermal energy is held by the system). A certain minimum value called the Lawson criterion marks the point at which the reaction produces more energy than it uses and becomes self-sustaining, so a higher triple product indicates a more efficient reaction.
"The new record is a tremendous achievement by the international team," said Thomas Klinger, Head of Operations at Wendelstein 7-X and Head of Stellarator Dynamics and Transport at IPP in a statement. "Elevating the triple product to tokamak levels during long plasma pulses marks another important milestone on the way toward a power-plant-capable stellarator."
Key to the success of this latest milestone was the development of a new fuel pellet injector that combined continuous refueling of the reactor with pulsed heating to maintain the required plasma temperature. Over a 43-second period, 90 frozen hydrogen pellets were fired into the plasma at up to 2,600 feet (800 metres) per second, roughly the speed of a bullet. Pre-programmed pulses of powerful microwaves heated the plasma, which reached a peak temperature of 30 million degrees C, and this coordination between the microwave pulses and the pellet injection crucially extended how long the plasma could be stably maintained.
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This same campaign also increased the energy turnover of the reaction to 1.8 gigajoules over a six-minute run, smashing the reactor's previous record of 1.3 gigajoules from February 2023. Energy turnover is a combination of the heating power and plasma duration of a fusion reactor and an indication of the reactor's ability to sustain the high-energy plasma. It is therefore another crucial parameter for future power plant operation. The new value even exceeds the record achieved by the Experimental Advanced Superconducting Tokamak (EAST) in China earlier this year, further evidencing stellarators' potential.
"The records of this experimental campaign are much more than mere numbers. They represent a significant step forward in validating the stellarator concept—made possible through outstanding international collaboration," summarized Robert Wolf, Head of Stellarator Heating and Optimization at IPP in statement.
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Record-Breaking Results Bring Fusion Power Closer to Reality
A twisting ribbon of hydrogen gas, many times hotter than the surface of the sun, has given scientists a tentative glimpse of the future of controlled nuclear fusion —a so-far theoretical source of relatively 'clean' and abundant energy that would be effectively fueled by seawater. The ribbon was a plasma inside Germany's Wendelstein 7-X, an advanced fusion reactor that set a record last May by magnetically 'bottling up' the superheated plasma for a whopping 43 seconds. That's many times longer than the device had achieved before. It's often joked that fusion is only 30 years away—and always will be. But the latest results indicate that scientists and engineers are finally gaining on that prediction. 'I think it's probably now about 15 to 20 years [away],' says University of Cambridge nuclear engineer Tony Roulstone, who wasn't involved in the Wendelstein experiments. 'The superconducting magnets [that the researchers are using to contain the plasma] are making the difference.' 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That's an immense engineering challenge but one accepted by several inertial fusion energy startups, such as Marvel Fusion in Germany; other start-ups, such as Xcimer Energy in the U.S., meanwhile, propose using a similar system to ignite just one fuel pellet every two seconds. Ma admits that the NIF approach faces difficulties, but she points out it's still the only fusion method on Earth to have demonstrated a net energy gain: 'Fusion energy, and particularly the inertial confinement approach to fusion, has huge potential, and it is imperative that we pursue it,' she says. Instead of igniting fuel pellets with lasers, most fusion power projects—like the Wendelstein 7-X and the JET reactor—have chosen a different path to nuclear fusion. Some of the most sophisticated, such as the giant ITER project being built in France, are tokamaks. These devices were first invented in the former Soviet Union and get their name from a Russian acronym for the doughnut-shaped rings of plasma they contain. They work by inducing a powerful electric current inside the superheated plasma doughnut to make it more magnetic and prevent it from striking and damaging the walls of the reactor chamber—the main challenge for the technology. The Wendelstein 7-X reactor, however, is a stellarator—it uses a related, albeit more complicated, design that doesn't induce an electric current in the plasma but instead tries to control it with powerful external magnets alone. The result is that the plasmas in stellarators are more stable within their magnetic bottles. Reactors like the Wendelstein 7-X aim to operate for a longer period of time than tokamaks can without damaging the reactor chamber. The Wendelstein researchers plan to soon exceed a minute and eventually to run the reactor continuously for more than half an hour. 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