The 'dumb machine' promising a clean energy breakthrough

A complex, decades-old fusion design, the stellarator, is emerging as a potentially more stable path to limitless clean energy than its rivals. | Contesto: cronaca

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• The 'dumb machine' promising a clean energy breakthrough

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In the high-stakes global race to harness the power of the stars, a complex and long-overlooked machine called the stellarator is staging a quiet comeback. While flashier projects like tokamaks have dominated fusion research for decades, a new generation of engineers and physicists, armed with supercomputing power and advanced materials, are now betting that the stellarator's inherent stability could solve fusion's most persistent problem: keeping a roiling, super-hot plasma contained long enough to generate more energy than it consumes. The Wendelstein 7-X reactor in Greifswald, Germany, the world's largest and most advanced stellarator, has begun to deliver experimental results that are turning heads across the scientific community. The fundamental challenge of fusion energy is one of confinement. To force atomic nuclei to fuse, releasing immense energy, fuel must be heated to temperatures exceeding 100 million degrees Celsius—hotter than the core of the sun. At these temperatures, matter exists as a plasma, a chaotic fourth state of matter that will instantly vaporize any physical container. Both stellarators and the more common tokamaks use incredibly powerful magnetic fields to create an invisible "bottle" to hold this plasma in a suspended, donut-shaped ring called a torus. The critical difference lies in how they generate the twisting magnetic field necessary to keep the plasma stable and away from the reactor walls. Tokamaks, the workhorse of fusion for fifty years, use a strong electrical current driven through the plasma itself to help generate part of the confining magnetic field. This approach is powerful and relatively straightforward to design, but it has a major flaw. The plasma current can become unstable, leading to sudden disruptions that halt the reaction in a fraction of a second, potentially damaging the reactor. The stellarator, by contrast, is what physicists call a "dumb machine." Its entire, exquisitely complex magnetic cage is generated solely by external, twisted coils. It requires no large internal current, theoretically making it inherently stable and capable of running continuously, not just in brief pulses. For most of fusion's...

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Categoria: cronaca