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In many ways, Jet is a mini-Iter: the design is broadly similar and the basic physics is the same. Research at Jet over the past 20 years has led to continuous advances in understanding the behaviour of the plasma. These have led to reduced heat loss due to turbulence and that implies improved efficiency. It is research like this that makes the experts so confident that Iter's time has come. That is not to deny that challenges remain: materials to handle the heat and neutron damage need to be designed, the production of tritium using lithium needs to be demonstrated and the behaviour of a burning plasma has yet to be fully explored.
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The goal is to exploit the same basic physics to generate energy here on Earth. In fact, we are trying to do much better than the sun, which kilo for kilo is several thousand times less efficient than the human body at generating energy. Crucially, that is not because the energy released when two protons fuse is small. In fact a fusion reaction generates around a million times more energy than is released in a typical chemical reaction, like those that take place in the human body or when we burn a lump of coal. Instead, the inefficiency is due to the fact that proton-proton fusion within the sun is very rare: it takes a proton in the sun around 5bn years to fuse.