New nuclear fusion record brings us one step closer to unlimited clean energy

We have reached one step closer to realising the goal of limitless clean energy with the same kinds of reactions that powers the Sun and the stars.

Researchers have set a new nuclear fusion reaction record and produced more power using the technology than ever before.

They used the Joint European Torus, (JET), a large and powerful fusion machine at the Culham Centre for Fusion Energy near Oxford, England, to reliably generate fusion energy. JET’s final deuterium-tritium experiments generated high fusion power for five seconds while creating the groundbreaking record of 69 megajoules using just 0.2 milligrams of fuel. That is equivalent to the amount of energy produced by around 15 kilograms of TNT.

Nuclear fusion refers to the reactions where two light atoms’ nuclei combine to form a heavier one along with a massive release of energy. But this is not an easy process. Atomic nuclei have a strong repulsion against each other. That is why the sun gets these nuclei to collide with each other at extremely high temperatures of around ten million degrees Celsius. That is what is required to overcome that mutual repulsion.

But once two nuclei come very close to each other, the attractive nuclear force between them will become stronger than the electrical repulsion, letting them fuse. This will only happen if the nuclei are confined to a small space to increase the chances of collision. This is achieved by the sun with the extreme pressure caused by its incredibly strong gravity.

JET is something called a tokamak, a machine that uses powerful magnetic fields to confine plasma into the shape of a donut. Most researchers looking to create commercial fusion energy use two hydrogen variants — deuterium and tritium. The fusion of deuterium and tritium produces a helium atom and a massive amount of energy.