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The Joint European Torus (JET), one of the world’s largest and most powerful fusion machines, has demonstrated the ability to reliably generate fusion energy, whilst simultaneously setting a world-record in energy output.

These notable accomplishments represent a significant milestone in the field of fusion science and engineering.

In JET's final deuterium-tritium experiments (DTE3), high fusion power was consistently produced for 5 seconds, resulting in a ground-breaking record of 69 megajoules using a mere 0.2 milligrams of fuel.

Comparison of fusion energy results in 1997 (DTE1), 2021 (DTE2) and 2023 (DTE3) on the JET tokamak.

JET is a tokamak, a design which uses powerful magnetic fields to confine a plasma in the shape of a doughnut. Most approaches to creating commercial fusion favour the use of two hydrogen variants – deuterium and tritium. When deuterium and tritium fuse together they produce helium and vast amounts of energy, a reaction that will form the basis of future fusion powerplants.

Dr Fernanda Rimini, JET Senior Exploitation Manager, said:

"We can reliably create fusion plasmas using the same fuel mixture to be used by commercial fusion energy powerplants, showcasing the advanced expertise developed over time."

Professor Ambrogio Fasoli, Programme Manager (CEO) at EUROfusion, said:

"Our successful demonstration of operational scenarios for future fusion machines like ITER and DEMO, validated by the new energy record, instil greater confidence in the development of fusion energy. Beyond setting a new record, we achieved things we’ve never done before and deepened our understanding of fusion physics."

Dr Emmanuel Joffrin, EUROfusion Tokamak Exploitation Task Force Leader from CEA, said:

"Not only did we demonstrate how to soften the intense heat flowing from the plasma to the exhaust, we also showed in JET how we can get the plasma edge into a stable state thus preventing bursts of energy reaching the wall. Both techniques are intended to protect the integrity of the walls of future machines. This is the first time that we've ever been able to test those scenarios in a deuterium-tritium environment."

Record JET discharge No. 104522 during the DTE3 experimental campaign. Credit: EUROfusion consortium

Involvement of Polish researchers

More than 300 researchers and engineers from EUROfusion, a research consortium that brings together scientists from all over Europe, including the Institute of Plasma Physics and Laser Microfusion (IPPLM) staff, took part in these groundbreaking experiments at the headquarters of the UK Atomic Energy Authority, UKAEA) in Oxford, showcasing the unparalleled dedication and effectiveness of the international team at JET.

Dr. Agata Chomiczewska, IPPLM professor, national coordinator of the JET tokamak research, said:

"Our determination and international cooperation have produced exceptional results that represent a milestone in fusion energy research. This success not only confirms the ability to control plasma in tokamaks, but also represents a key step towards achieving the goal of commercial-scale energy production using nuclear reaction. There are still many challenges and years of research ahead of us, but I am convinced that our hard work will bring even more innovative solutions that will shape the global energy industry."

Map of countries and research centers being part of the EUROfusion consortium. Credit: EUROfusion consortium

Unique significance of JET

The results solidify JET’s pivotal role in advancing safe, low-carbon, and sustainable fusion energy.

UK Minister for Nuclear and Networks, Andrew Bowie, said:

"JET's final fusion experiment is a fitting swansong after all the groundbreaking work that has gone into the project since 1983. We are closer to fusion energy than ever before thanks to the international team of scientists and engineers in Oxfordshire."

Professor Sir Ian Chapman, UKAEA CEO, said:

"JET has operated as close to powerplant conditions as is possible with today’s facilities, and its legacy will be pervasive in all future powerplants. It has a critical role in bringing us closer to a safe and sustainable future."

Dr Pietro Barabaschi, ITER Director-General, said:

"Throughout its lifecycle, JET has been remarkably helpful as a precursor to ITER: in the testing of new materials, in the development of innovative new components, and nowhere more than in the generation of scientific data from Deuterium-Tritium fusion. The results obtained here will directly and positively impact ITER, validating the way forward and enabling us to progress faster toward our performance goals. On a personal note, it has been for me a great privilege having myself been at JET for a few years. There I had the opportunity to learn from many exceptional people."

The interior of the JET tokamak. Credit: UKAEA

40 years of innovative nuclear fusion research

JET has been instrumental in advancing fusion energy for over four decades, symbolising international scientific collaboration, engineering excellence, and the commitment to harness the power of fusion energy – the same reactions that fuel the Sun and stars.
JET demonstrated sustained fusion over five seconds at high power and set a world-record in 2021. JET’s first deuterium-tritium experiments took place in 1997.

In December 2023, JET ceased operations as a plasma generating device, moving to the next phase of its operational cycle, including repurposing and decommissioning. A celebration is planned for late February 2024 that will honor his founding vision and the collaborative spirit that ensures success.

The achievements at JET, from the major scientific milestones to the setting of energy records, underscores the facility’s enduring legacy in the evolution of fusion technology.

Its contributions to fusion science and engineering have played a crucial role in accelerating the development of fusion energy, which promises to be a safe, low carbon and sustainable part of the world’s future energy supply.

The February 8, 2024, press conference announcing the record results can be viewed at: www.youtube.com

Source: EUROfusion, UKAEA

Researchers from the EUROfusion consortium, including Polish ones from the Institute of Plasma Physics and Laser Microfusion (IPPLM), have recently completed successful experiments at JET (Joint European Torus) tokamak, the nuclear fusion research device located in Oxford (United Kingdom Atomic Energy Authority, UKAEA) in the United Kingdom.

On Thursday, 8 February, representatives of EUROfusion, UKAEA and the international nuclear fusion project ITER will present the results of these experiments at a press conference.

The conference will be attended by:

• Ambrogio Fasoli, Programme Manager (CEO) of EUROfusion
• Ian Chapman, CEO of UK Atomic Energy Authority (UKAEA)
• Tim Luce, Deputy Head of ITER Construction Project
• Athina Kappatou, former Deputy Task Force Leader for the EUROfusion Work Package Tokamak Exploitation (Max Planck Institute for Plasma Physics, Garching, Germany)
• Joëlle Mailloux, Head of JET Science Programme Support Office (UKAEA)
• Mikhail Maslov, Scientific Coordinator – JET Tritium-rich High Fusion Power Experiments (UKAEA)

Soon we will provide more information on this topic.

The last series of experiments ended on the JET (Joint European Torus) tokamak, 40 years after its launch.

On 25 June 1983, the first plasma was obtained on this device, four decades later - on Monday, 18 December 2023, at 10:06 p.m., the last plasma discharge number 105842 was observed. It was the last experiment on JET and the end of a certain era.

UKAEA Chief Executive Officer, Prof Sir Ian Chapman, who was in attendance in JET’s Control Room for the final plasma experiment, said: "This is the final milestone in JET’s 40-year history. Those decades of research using JET by dedicated teams of scientists and engineers have played a critical role in accelerating the development of fusion energy."

Researchers from European research centres being part of the EUROfusion consortium, including scientists from the Institute of Plasma Physics and Laser Microfusion, on JET’s final day of plasma continued to push scientific boundaries, firstly attempting an inverted plasma shape for the first time at Culham before deliberately aiming electrons at the inner wall to improve understanding of beam control and damage mechanisms. The findings of these experiments will support the development and operation of ITER in France.

JET will now move on to the next phase of its life cycle in early 2024 for repurposing and decommissioning, and final shutdown which will last until c.2040.

UKAEA is currently developing the STEP (Spherical Tokamak for Energy Production) programme aimed at demonstrating the ability to generate net electricity from nuclear fusion.

A group of researchers during the last experimental campaign at the JET tokamak, including a team of the IPPLM employees (December 2023). Photo: © IPPLM

About JET

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, Oxfordshire, UK and is collectively used by more than 31 European laboratories under the management of the EUROfusion consortium involving the participation of more than 350 researchers and engineers from all over Europe including Poland.

JET tokamak is an experimental torus-shaped fusion reactor that uses magnetic fields to keep hot, ionized gas (plasma) away from the inner walls of the vessel, allowing it to operate safely at temperatures of 150 million degrees Celsius - ten times hotter than the temperature at the centre of the Sun.

The core of the reactor is a vacuum chamber in which plasma is held in place by strong magnetic fields. In the current configuration, the main and minor radii of the plasma torus are 3 and 0.9 meters, respectively, and the total plasma volume is 90 cubic meters. A diverter located at the bottom of the vacuum chamber allows controlled removal of escaping heat and gas.

JET commenced operation in 1983 as a joint European project, undergoing several enhancements to improve its performance over the years. In 1991, JET became the world's first reactor to operate using a 50–50 mix of tritium and deuterium. The facility set numerous fusion records including a record Q-plasma (the ratio of the fusion power produced to the external power put in to heat the plasma) of 0.64 in 1997. Since 2011, the first wall of the vacuum chamber was made of beryllium and tungsten, which was to reflect the materials selected for the construction of the ITER reactor, i.e. the so-called ITER LIKE WALL. The next fusion energy record output of 59 megajoules in a five-second pulse was accomplished in December 2021. Built by Europe and used collaboratively by European researchers over its lifetime, JET became UKAEA property in October 2021.

Source: UKAEA, IPPLM

We invite you to participate in the 17^th edition of the Summer School of Plasma Physics organized by the Institute of Plasma Physics and Laser Microfusion. The event will take place in Kudowa-Zdrój (Poland) on 3-7 June 2024.

Kudowa Summer School "Towards Fusion Energy" is an excellent opportunity for young scientists, master's and PhD students from both Poland and abroad to expand their knowledge of plasma physics. During the School, participants will be able to present their own research achievements, and the best presentations will be awarded.

Lectures conducted by outstanding specialists from leading research centers in the world will cover various aspects of plasma physics, including thermonuclear energy, experiments using plasma, plasma technology and diagnostics.

Registration for the event will start on 7 December 2023 and will last until 11 April 2024.

The deadline for submitting abstracts is 23 February 2024.

Detailed information is available on the school's official website: kudowaschool.ipplm.pl.

Don't miss the opportunity and take part in one of the most important scientific events of the coming year!

EUROfusion announces the successful completion of its third and final deuterium-tritium experimental campaign (DTE3) at the Joint European Torus fusion device (JET). The experiments explored fusion processes and control techniques under similar conditions to and in preparation for future fusion power plants, marking an important leap ahead in our understanding of fusion plasmas.

The experimental campaign at JET was conducted by over 300 scientists participating in EUROfusion from across Europe together with engineering and scientific technical staff at the United Kingdom Atomic Energy Authority. JET is the only existing facility of its kind that can already operate with the high-performance deuterium-tritium fuel mix that will be used in future fusion power plants. While most fusion experiments use fuels like hydrogen or deuterium alone, testing with this deuterium-tritium mix is essential to get as close as possible to the conditions of a real fusion power plant.

The experiments at JET have optimized fusion reactions in deuterium-tritium and developed techniques to manage fuel retention, heat exhaust and materials evolution. This has generated crucial insights for the design and operation of future reactors like the international ITER experiment and the DEMO demonstration fusion power plant as well as for all other efforts worldwide to develop fusion power plants.

Tony Donné, Programme Manager (CEO) at EUROfusion, highlights, "These experiments at JET are a testament to the collaborative spirit and innovation in the EUROfusion community, paving the way for the next generation of fusion research and technology."

EUROfusion's experimental campaign at JET highlights Europe's pivotal role in advancing fusion research and underscores its leadership in the global pursuit of clean, sustainable energy. This campaign marks a significant step forward in developing the technologies and methodologies essential for future fusion power plants.

JET Torus Hall. Credit: UKAEA courtesy of EUROfusion

Why This Experimental Campaign Matters:

• Bridging Past and Future in Fusion Research: The experimental campaign built on experiments at the end of 2021, enhancing our understanding of deuterium-tritium plasmas. This campaign's insights into optimizing fusion reactions and developing novel operational strategies link past learnings with future applications in fusion technology.
• Validating Physics Across Scales and Fuels: Researchers tested new concepts developed in smaller European tokamaks in JET, initially with deuterium and then with a deuterium-tritium fuel mix. This research is key to help understand how processes observed in smaller devices will scale to larger future fusion projects.
• Advancing Tritium Fuel Management: JET has made significant strides in managing the fuel component tritium, pioneering novel monitoring and cleaning technologies including laser-based diagnostic methods like LID-QMS (Laser Induced Desorption – Quadrupole Mass Spectrometry). These innovations are crucial for ITER's future operations, ensuring accurate tritium accountancy and enhancing operational safety.
• Replicating Operational Scenarios: A major success of the DTE3 campaign was its ability to replicate the high-fusion-energy experiments from 2021’s second deuterium-tritium experimental campaign (DTE2). This accomplishment highlights the reliability and maturity of JET's operational methodologies that are essential for the ITER project's future success.
• Integrated Scenarios with Compatible Exhaust Solutions: The campaign involved testing diverse operational scenarios to efficiently manage heat exhaust from the hot, ionised gas fuel (plasma). Researchers focused on dispersing energy at the plasma edge while maintaining high energy levels in the plasma core, a critical balance for reactor feasibility. This included minimizing or eliminating energy outbursts from plasma edge instabilities and implementing innovative heat load management techniques like feedback-controlled impurity gas injections to create a localised radiator plasma zone around the X-point. Additionally, the team demonstrated real-time control of the D-T fuel mix by injecting gas and frozen deuterium pellets, a key method for controlling fusion reactions. These advancements are instrumental for the successful operation of future fusion reactors.
• Enhancing Knowledge of High-Energy Neutron Effects: Focusing on the impact of fusion-born 14.1 MeV neutrons that carry the energy from fusion reactions out of the plasma, the campaign provided insights into their effects on cooling systems and electronics, the latter in collaboration with CERN. This knowledge is essential for designing safe, more efficient future fusion reactors.

The Joint European Torus (JET) is a fusion experiment of the donut-shaped tokamak design located at Culham Centre for Fusion Energy in Oxfordshire, UK. The facility uses magnetic fields to keep the hot, ionised gas (plasma) away from the vessel's interior walls, enabling safe operation at 150 million degrees Celsius - ten times the temperature at the core of the Sun.

About JET

JET commenced operation in 1983 as a joint European project, undergoing several enhancements to improve its performance over the years. In 1991, JET became the world's first reactor to operate using a 50–50 mix of tritium and deuterium. The facility set numerous fusion records including a record Q-plasma (the ratio of the fusion power produced to the external power put in to heat the plasma) of 0.64 in 1997 and a fusion energy record output of 59 megajoules in a five-second pulse in December 2021. Built by Europe and used collaboratively by European researchers over its lifetime, JET became UKAEA property in October 2021, celebrated its 40th anniversary in June this year, and will cease operations at the end of 2023.

Source: EUROfusion