physics

Tokamak Energy

Tokamak Energy is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tokamak Energy rather than just read about it. In short: Tokamak Energy is a fusion power and superconducting technologies company based near Oxford in the United Kingdom, established in 2009. The company develops fusion energy systems and high temperature superconducting (HTS) technologies.

Key takeaways

Tokamak Energy belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tokamak Energy to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tokamak Energy from memory before moving on to harder problems.

Reference excerpt

Tokamak Energy is a fusion power and superconducting technologies company based near Oxford in the United Kingdom, established in 2009. The company develops fusion energy systems and high temperature superconducting (HTS) technologies. While initially focused on the development of fusion energy, it has expanded into the development of HTS technologies for applications including power distribution, life sciences, propulsion and advanced manufacturing. In 2026, Tokamak Energy was named as Magnet Systems Partner for the UK Government's STEP Fusion programme.

History Tokamak Energy is a commercial spin-out from the United Kingdom Atomic Energy Authority based in Oxfordshire. As of 2025, the company had raised $335m, comprising $60m from the UK and US governments and $275m from private investors, including LRG Capital Group, Dr. Hans-Peter Wild, and David Harding, CEO of Winton Capital. One of the company's first devices was the copper magnet-based ST-25; in 2015 this was upgraded with rare-earth barium copper oxide (REBCO) high temperature superconductors (HTS) to the ST-25HTS. From 2018 the company has operated the ST40 high-field compact spherical tokamak, which in March 2022 reached plasma ion temperature above 100 million degrees Celsius, considered the threshold for commercial fusion. A peer-reviewed scientific paper on the achievement has been published by the Institute of Physics. In 2019, the company announced it achieved a 24 Tesla magnetic field at 20 Kelvin with its patented HTS magnet technology. In 2023, it announced it had built a set of HTS magnets to be assembled and tested in fusion power plant-relevant scenarios in its new Demo4 in-house facility. In 2025 the company successfully replicated fusion power plant fields for the first time with Demo4, achieving field strengths of 11.8 Tesla at -243 degrees Celsius in tests conducted at its headquarters outside Oxford, UK. In October 2022, the UKAEA and Tokamak Energy announced a five-year framework agreement to collaborate on developing spherical tokamaks for power generation. The collaboration focuses on areas including materials development and testing, power generation, fuel cycle, diagnostics, and remote handling, in the UKAEA's STEP machine. In May 2023, the United States Department of Energy granted the company's US subsidiary, Tokamak Energy Inc., additional funding through its Milestone-Based Fusion Development Program, which partners selected companies with U.S. national laboratories, universities, and other institutions to advance designs and R&D for fusion power plants, representing a major step in the U.S.'s commitment to a pilot-scale demonstration of fusion within a decade. In November 2024, the company secured $125mn in a funding round led by East X Ventures and Lingotto Investment Management, which saw investment from British Patient Capital, Furukawa Electric Company, global maritime company BW Group and US-based Sabanci Climate Ventures. In December 2024, the company announced that it had partnered with the United States Department of Energy and UK Department for Energy Security and Net Zero to accelerate fusion energy development through a $52M Upgrade to the ST40 facility. In September 2025, Tokamak Energy acquired specialist engineering company Ridgway Machines in Leicestershire to accelerate the growth and manufacturing capabilities of its TE Magnetics HTS business. Ridgway Machines operates as a Tokamak Energy subsidiary, keeping its brand, staff, and facility unchanged. In April 2026, Tokamak Energy was named as Magnet Systems Partner for the UK Government's STEP Fusion programme.

See also Commonwealth Fusion Systems DEMOnstration Power Station Fusion Industry Association List of nuclear fusion companies Spherical Tokamak for Energy Production

References

External links Official website

Worked examples

Example 1 — a first encounter with Tokamak Energy

Start with the simplest possible case. Write down what Tokamak Energy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tokamak Energy before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tokamak Energy ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tokamak Energy

In research: Tokamak Energy appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tokamak Energy in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tokamak Energy is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2009 establishments in England, Companies based in Oxford, Electric power companies of the United Kingdom, so understanding it makes those chapters shorter.
In everyday life: Look for Tokamak Energy outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Tokamak Energy” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Tokamak Energy in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tokamak Energy means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tokamak Energy out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tokamak Energy in simple terms?

Why does Tokamak Energy matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tokamak Energy?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tokamak Energy.