ITER — which is set to become the world’s biggest fusion reactor, and one of history’s most expensive science experiments — has reached a key milestone on its mission to create a mini Sun on Earth. But despite the apparent progress, the megaproject has also been hit by yet more delays and surging costs. Nineteen giant magnetic coils — each measuring 17 metres tall and weighing 360 tonnes — have finally been delivered to southern France, where ITER is being constructed. The magnets will form a cage around a donut-shaped chamber called a tokamak. Here they will create a magnetic…
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