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" ... At the heart of the reactor, a device called a tokamak uses toroidal (doughnut-shaped) magnetic field coils to contain the plasma created by the fusion process. The coils – 18 in all, each the size as a six-story building and weighing 6,000 metric tons – are the most powerful superconductive magnets ever designed. ... "
" ... The plasma volume inside the tokamak at ITER will be several times larger than that generated by any previous fusion reactors. Because of the high temperatures, metal cannot be used to confine the highly unstable plasma. Therefore, an enormous magnetic field is used to contain the plasma and ensure the fusion reactions can happen. This is achieved by a series of toroidal superconducting magnets, or field coils. ... "