Alex McColgan

This is the type of reactor which will be used at ITER.

In contrast, inertial confinement fusion, the other confinement method, takes its inspiration from thermonuclear bombs.

It works by firing lasers or projectiles at a small pellet containing fusion fuel, seeking to create temporary blobs of plasma which release fusion energy only for a few nanoseconds before the plasma dissipates.

Both of these approaches are immense engineering challenges, requiring either huge amounts of continuous electricity in the case of MCF, or even larger pulses of electricity drawn from banks of capacitors in the case of ICF.

But not only do the huge amounts of power involved put tremendous strain on components, which have to be replaced frequently,

It means that for a reactor to be viable, the energy obtained from the fusion reaction must exceed the colossal amount of energy required to initiate it, a considerable challenge.

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