Make room, Lady Gaga. Another star is born!
Nuclear fusion reactions are what make stars, and our source of warmth, possible. Recreating these reactions on Earth sounds like something you’d only see in sci-fi movies – until now.
TAE Technologies, the world’s largest private fusion energy developer, has successfully harnessed the energy of three Suns.
Its novel fusion reactor, dubbed “Norman”, recently achieved the critical milestone of producing stable plasma at temperatures of over 50 million degrees Celsius (90.000032 million Fahrenheit) – that’s about three times hotter than the Sun’s core!
Check out a virtual tour of the reactor here.
Hot and powerful gas.
Not to be confused with nuclear fission, fusion involves heating light atoms (e.g. hydrogen) to searing temperatures until it becomes a plasma (the fourth state of matter).
The plasma nuclei are then bottled up under high pressures and constantly smash into each other to form heavier nuclei, liberating lots of energy in the process.
The main challenge for fusion reactions is to keep the hot plasma confined long enough to produce utility-scale electricity.
TAE’s Norman is a field-reversed configuration (FRC) fusion reactor, unlike the commonly used donut-shaped tokamak reactor used by ITER. Compared to the tokamak, FRC reactors are less expensive and less complex.
The amount of compute required to optimise these experiments is dizzying. TAE used machine learning to develop an “Optometrist Algorithm” to design novel solutions to the highly complex problems regarding plasma behaviour.
While achieving the significant breakthroughs in sustaining a stable plasma, Norman is still not hot enough to generate any sparks of electricity. The reactor uses all the energy it generates to maintain the reaction, leaving no net energy to power anything other than itself.
TAE has plans to scale to the conditions necessary for an economically viable demonstration facility by the end of this decade. The next-generation FRC reactor, called Copernicus, is designed to sustain twice the temperature of the Norman reactor. This will allow TAE to simulate net energy production, paving the way for its commercialisation.
Nuclear fusion is virtually a zero-carbon source of energy. The reaction produces zero carbon dioxide or any other harmful atmospheric emission. And the only fuels required are hydrogen isotopes and boron. It totally gets the climate green stamp.
Hydrogen-boron fuel is “the cleanest, most environmentally-friendly fuel source on Earth, with no harmful primary byproducts, and enough natural supply to sustain the planet for virtually 100,000 years”, says TAE Technologies CEO Michl Binderbauer.
It’s also fundamentally impossible for nuclear fusion reactors to cause nuclear accidents. Contrary to fission reactions, it doesn’t produce energy through chain reactions. Any minor shift in the working configuration of the fusion reactor triggers its total shutdown.
But if you find yourself wondering if this is too good to be true, your suspicions are not unfounded. Fusion might have its downsides, too.
Critics of the technology believe that it isn’t as ideal as its proponents paint it to be, citing four main issues: radiation damage to structures; radioactive waste; the need for biological shielding; and the potential for nuclear weapons proliferation.
Racing against the carbon clock.
On paper, fusion technology seems great on many levels. It’s experimentally demonstrated to work, it’s a clean source of energy, and it’s relatively safe (compared to nuclear fission).
But another challenge manifests – Can nuclear fusion be brought to life quick enough in the battle against climate change?
ITER, also a major nuclear fusion project, aims to achieve its first sustained plasma no earlier than 2025. And if it succeeds, it will be at least another decade before it can power electricity grids.
In the context of desperately needed sustainable energy alternatives, widespread deployment of fusion power might just miss the boat to make a profound impact. To be exact, there are just 24 years left until the amount of carbon dioxide released into the atmosphere causes a global warming of 2 degrees Celsius, the upper limit set by the Paris Agreement.
Though unclear if commercial fusion power could make it in time to combat climate change, perhaps it will be key to meeting the future power demand in the world, which will only double or even triple in decades to come.
Main picture: Inside the reaction chamber of a tokamak donut reactor used for nuclear fusion reactions. Photo credit: Rswilcox – Own work, CC BY-SA 4.0