Researchers from the EUROfusion consortium announced scientific results from their record-breaking experimental campaign at the Joint European Torus (JET) fusion facility in 2021. These results, announced at the 29th IAEA Fusion Energy Conference in London, include the first observations of alpha heating, the process by which the fusion reaction can keep its fuel hot. Other important results include control techniques to protect the walls of fusion machines, heating techniques, and ways to recover fusion fuel absorbed in the walls of the machine. The work will prove crucial to operate future fusion experimental machines such as ITER and demonstrates the potential of fusion as a future energy source, say the researchers.

In 2021, the EUROfusion consortium of fusion laboratories around Europe, including Polish researchers from the Institute of Plasma Physics and Laser Microfusion (IPPLM) in Warsaw, ran a dedicated experimental campaign at the Joint European Torus facility (JET) in Culham, UK to explore the extreme conditions expected in the international ITER fusion energy research project and the fusion power plants to follow.

The researchers reached conditions including temperatures of 150 million degrees Celsius inside the donut-shaped cloud of plasma (hot, charged gas) that is suspended inside JET's magnetic field cage.

"One of our most eye-catching results is the first detailed observation of the fusion fuel keeping itself hot through alpha heating. This is the process where high-energy helium ions (alpha particles) coming out of the fusion reaction transfer their heat to the surrounding fuel mix to keep the fusion process going", says Costanza Maggi, a UKAEA Fellow and former JET Task Force Leader. "Studying this process under realistic conditions is crucial to developing fusion power plants."

JET interior with superimposed plasma credit UKAEA courtesy of EUROfusion 1
 JET interior with superimposed plasma. Credit: UKAEA courtesy of EUROfusion

First look at alpha heating and other results

The results presented by the researchers will prove crucial to inform the design and operation of future fusion experimental machines running on deuterium-tritium (a fusion fuel mix of two hydrogen isotopes used to produce fusion energy) fuel. Most results have been published in a special issue of the scientific journal Nuclear Fusion, with the work on alpha heating appearing in the prestigious scientific journal Physical Review Letters.

  • The first observations of alpha heating, where the high-energy helium ions (alpha particles) produced by fusion reactions keep the surrounding fuel mix hot enough without disturbing fusion conditions.
  • A successful demonstration of a control technique to protect the walls of the exhaust system. This divertor is the only part of a tokamak (a donut-shaped device used to confine hot plasma) that comes into direct contact with the hot fuel and needs to withstand more intense conditions than spaceships re-entering Earth's atmosphere.
  • The experiments confirmed predictions from advanced computer models for heat transport inside the plasma, which are crucial to extrapolate results from current experimental setups to larger future machines like ITER and DEMO.
  • Successful tests of methods to recover tritium fuel that has been absorbed by the interior metal wall of the tokamak. Efficient recovery of tritium is key to the operation and end-of-life decommissioning of fusion machines.
  • Verified a heating technique planned for the ITER project to deposit external heating exactly where needed. The demonstration gives confidence in the design and planned operation of the international fusion project ITER.

Record-setting experiments

JET is the only operating fusion machine of the tokamak design that can produce large amounts of fusion reactions, because of its unique capability to operate with the fuel mix deuterium-tritium. This is the high-performance fuel mix planned for the international ITER project and the future European demonstration fusion power plant DEMO.

The second deuterium-tritium experimental campaign (DTE2) at JET in 2021 set a world record of 59 megajoules for the most fusion heat produced in a single shot, which received great public interest when announced in February 2022.

Record DT shot 99971 credit UKAEA courtesy of EUROfusion
Record DT shot 99971. Credit: EUROfusion consortium

Volker Naulin, Head of the EUROfusion Fusion Science Department, said:

"The DTE2 campaign has been prepared over many years. The scientific results and the energy record achieved at JET in 2021 show that we understand and control fusion plasma under conditions as close to those in future fusion devices as we can get. We predicted and finally showed that we can produce, maintain, and study fusion under high-performance conditions, for as long as the machine allows. This confirms that we are on the right path to fusion energy to the grid."

Ambrogio Fasoli, Director of the Swiss Plasma Center and Programme Manager-elect of EUROfusion, said:

"The JET DTE2 campaign has enriched the formidable knowledge on magnetic fusion that’s provided the basis for the operation of ITER operation. It will also help guide the development of DEMO, which is the backbone device of the European strategy towards fusion power plants. The scientific results included work on plasma conditions and materials compatible with power plants and crucial information for the overall European strategy. They provide a crucial basis for a safe approach to burning plasma in ITER."

Fernanda Rimini, JET Senior Exploitation Manager (UKAEA), said:

"The foundations of the JET success lie in the vision, ambition and exceptional combination of physics and engineering talent of the design team: they produced a device with unique characteristics for the times, namely size and D-T capability, but they also fostered an environment rewarding the dialogue and tight integration between physics and engineering. The tradition of excellence was continued by the JET Team, working over the last 40 years to advance fusion research."

Agata Chomiczewska, national coordinator of research at the JET tokamak, IPPLM, said:

"We are glad that Polish researchers are contributing to the success achieved at the JET tokamak during the DTE2 campaign. The thing about science is that we are constantly discovering something new. There are still many challenges ahead of us, but thanks to our common determination in pursuing the goal, the prospect of commercial fusion power plants becomes real."

40 years of fusion science

JET is the largest and most successful fusion experiment in the world, and a central research facility of the European Fusion Programme. JET is based at the UKAEA campus in Culham, UK and is collectively used by more than 31 European laboratories under the management of the EUROfusion consortium—experts, students, and staff from across Europe, co-funded by the European Commission.

Fusion researchers across Europe and beyond celebrated the 40th anniversary of JET's first plasma shot on Sunday 25 June this year. Since its inception in 1983, JET has been at the forefront of groundbreaking achievements, spearheading the pursuit of safe, low-carbon, and sustainable fusion energy solutions to meet the world's future energy demands.

Over its lifetime, JET has delivered crucial insights into the complex mechanics of fusion, allowing scientists to plan the international fusion experiment ITER and DEMO, the demonstration fusion power plant currently under design by the European fusion community.

JET Torus Hall credit UKAEA courtesy of EUROfusion 1
 JET Torus Hall. Credit: UKAEA courtesy of EUROfusion

Fusion energy’s potential

Fusion, the process that powers stars like our sun, promises a near-limitless clean baseload electricity source for the long term, using small amounts of fuel that can be sourced worldwide from inexpensive materials. The fusion process brings together atoms of light elements like hydrogen at high temperatures to form helium and release tremendous energy as heat. Fusion is inherently safe in that it cannot start a run-away process and produces no long-lived waste.

Source: EUROfusion

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Our laboratories

Research projects carried out at the IPPLM are funded by the Polish Ministry of Education and Science, the National Science Centre and by the European Commission within the framework of EUROfusion Consortium under grant agreement No 633053. Financial support comes also from the International Atomic Energy Agency, European Space Agency and LaserLab Consortium as well as from the Fusion for Energy Agency.

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