Fusion has long been called the energy of the future. But how close are we really?
Jan Blomgren examines fusion’s enormous promise – and the problems that still need to be solved.
How can we produce enough tritium to keep the reaction going? What happens when high-energy neutrons damage the materials inside the reactor? And why could turning fusion into a reliable power plant be much harder than the headlines suggest?
And perhaps most importantly: could fusion have another valuable role – as a powerful source of neutrons?
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