UK’s JET labs have recently managed to generate and maintain relatively high thermal energy levels in five seconds, a promising sign of the feasibility of nuclear fusion
In the promising net zero solution field, nuclear fusion stands out in its scope and ambitions. By successfully replicating the response that powers the sun, humans can—in the words of Stephen Hawking—release “inexhaustible, inexhaustible energy without pollution or global warming ”. However, fusion development has been moving forward at a glacial speed for decades, and the breakthrough is intermittent at best.
This may be about to change. Through comprehensive international cooperation and billions of dollars in public and private investment, scientists have recently made a series of meaningful progress in the duration and possible power output of fusion reactions.
nuclear fission - the process of driving traditional nuclear power plants - involves the division of atoms , and fusion occurs when a pair of light nuclei combines to form a heavier atom nucleus . When this happens, huge energy is released: four times as much as fission and nearly four million times as burning fossil fuels . From a security point of view, it is almost impossible for nuclear meltdown , and will only produce a small amount of relatively short-lived radioactive waste .
A global alliance of physicists backed by China, Russia, the United States and several European governments is pursuing the incredible promise of fusion. With the opening of funding leaders, significant progress has been made recently in overcoming a range of scientific challenges—especially the huge temperatures required to trigger fusion reactions. At the core of the sun, atoms bind at about 10 million degrees Celsius; on Earth, the gravity there is much smaller, requiring at least 10 times the heat.
Since no known material can withstand such scorching temperatures, scientists have devised different methods to limit ultrathermal plasmas—a cloud of charged particles that undergo fusion—to allow for a sustained energy output. In , California, , the National Ignition Device (NIF) is developing the use of high-power lasers to compress fusion fuel into a tiny space, while researchers elsewhere in the world tend to limit through strong magnetic fields.
promising progress
combined with European torus (JET) is the pioneer of the latter. The UK-based JET Laboratory has broken its own world record of fusion energy, and has recently successfully generated and maintained relatively high thermal energy levels in five seconds. The energy generated is slightly less than 60 megajoules (MJ)—just enough to boil a few dozen kettles—but it marks an important step forward in seeking continuous fusion energy.
"The 5-second pulse and 59 MJ energy generation may not sound like much, but it shows that we can achieve continuous discharge, resulting in high fusion yields," said nuclear physicist Joelle Mailloux, who co-led the JET research team. "We now have a blueprint for future expansion of operations, with the goal of maintaining output for more than a few seconds."
However, global fusion research still faces huge obstacles. JET's record-breaking experiments use much more energy than it produces—the net energy gain from fusion has not been proven anywhere—and the magnets used to house plasma are heated too fast to run for a long time.
Still, progress is being made. Earlier this year, Chinese scientists managed to maintain a 17-minute fusion reaction—although the fuel source used was not suitable for large-scale power generation. Then there is the International Thermonuclear Experimental Reactor (ITER)—the world’s most ambitious fusion project, and everything goes well and will be put into operation by the mid-20th century.
According to data from the soon-to-decommissioned JET program, much larger ITER facilities in southern France are being built with materials that can withstand higher temperatures, theoretically allowing fusion experiments to run long enough to generate more energy than they consume. But experts say this is unlikely to happen before the late 2040s, and when it happens, it is not known how quickly fusion energy will become cost-effective.
"A series of startups"
Another serious problem revolves around two forms of hydrogen, namely deuterium and tritium, which are used to fuel the fusion reaction of ITER. Deuterium can be extracted in large quantities from seawater, but tritium is unusually rare (it is believed to exist in only 20 kg worldwide). To overcome this shortcoming, technology to “propagate” tritium during fusion is being explored, Mailloux said, but again, the technology may take decades to achieve.
enters private enterprises. In recent years, driven by billions of dollars in venture capital investment, a large number of startups seeking alternative fusion solutions have emerged. These include Google and Chevron -backed TAE Technologies, a California-based company that develops tritium-free fusion reactors.
TAE CEO Michl Binderbauer believes that by replacing rare tritium hydrogen isotopes with non-radioactive hydroboro, his team can avoid issues surrounding fuel availability and enable commercial energy production in the early 2030s.
"Our machines are much more compact than other fusion reactors; Binderbauer said: "A small city can be powered by cars the size of about two double-decker buses. "This means they will be easier to centrally manufacture, unlocking economies of scale. ”
Binderbauer claims that TAE is bullish in terms of pricing—the cost per kilowatt-hour will start in the middle, between high-end nuclear fission and gas at the bottom. As the cost of manufacturing complex components falls, energy prices will also fall.
However, not everyone in the global scientific community is so confident. As an undergraduate physics student in the 1960s, Ian Lowe, a green energy expert and professor emeritus at Griffith University in Australia, first heard that commercial fusion energy will take at least 50 years. More than half a century later, he fears that this will still be the case.
“Yes, exciting progress has been made, but ultimately all possible fusion reactors are still in the research stage, and we need clean energy solutions now,” Lowe "We already have renewable energy that can generate cost-effective zero carbon electricity; scaling these needs to be our focus. ”
