Fusion Energy and Tokamak Plasma Heating

The field includes 338 companies and 35 startups, including Tokamak Energy Ltd, Kyoto Fusioneering Ltd. and General Atomics. Tokamak Energy’s ST40 uses gyrotron-based electron-cyclotron heating and current drive. Kyoto Fusioneering works on high-power gyrotrons and microwave transmission, while General Atomics operates the DIII-D tokamak for research into plasma performance and heating scenarios.

Kyoto Fusioneering Ltd. is a notable heating-focused startup, with 44 documents in the window and reported growth of 138.5%. Its work includes high-power gyrotrons and microwave transmission, and it partnered with Realta Fusion on plasma-heating system design in March 2026. Tokamak Energy Ltd. is another relevant company, developing electron-cyclotron heating and current drive for its ST40 spherical tokamak.

Princeton Plasma Physics Laboratory has 750 documents in the window, followed by Chinese Academy of Sciences CAS with 572 and Oak Ridge National Laboratory with 541. Their work spans plasma behavior, energetic particles, neutral beam systems and heating scenarios. Max Planck Institute for Plasma Physics (Garching) is also active, with research on beam heating and fusion-relevant plasma performance.

Funding data lists $6.83 billion across 27 rounds and $215.3 million across 332 grants since 2020. These are aggregate figures for the topic and do not mean every listed award funds tokamak heating specifically. Individual records include company rounds and public or research grants, so project-level relevance should be checked before comparing funding amounts.

University of Tsukuba and Dexerials Corporation lead the listed patent holders, with 10 patents each. Laser Fusion and Shanghai Startorus Fusion Technology Co Ltd have 7 each, while Tokamak Energy Ltd has 6. These figures identify holders in the supplied patent-holder data; they do not indicate that every patent directly concerns plasma heating.

Yes: the 24-month window contains 170 patents, with patent activity growth of 9.9%. Publications moved in the opposite direction, with 2,565 in the last year and a 7.0% decline. This divergence suggests continued invention activity alongside a softer publication trend, but patent counts alone do not show whether inventions are commercially deployed or technically successful.

Recent developments include August 2026 work on CRAFT’s negative-ion neutral beam facility and a machine-agnostic surrogate model for electron-cyclotron heating and current drive. A separate HL-3 study examined how core-localized ECRH affects ion heat confinement. In September 2026, news highlighted Princeton’s PACMAN AI for plasma control and instability prediction. Together, these efforts address beam delivery, model speed and operational control.

The main listed approaches are Ohmic heating, neutral beam injection, ion cyclotron heating, electron cyclotron heating, lower hybrid heating and alpha-particle self-heating. They differ in how they transfer energy: through plasma current, injected energetic particles, radio-frequency waves or fusion products. Neutral beams and radio-frequency systems provide auxiliary heating, while alpha heating depends on fusion reactions already taking place in the plasma.

The United States leads the listed activity with 21,142 documents, followed by China with 9,747 and the United Kingdom with 8,155. Germany and France are also among the leading countries, with 5,827 and 5,491 documents respectively. These totals show where activity is concentrated in the dataset, not the relative technical maturity of each country’s programs.

Grid electricity is the largest listed application, with 2,791 documents; fusion research has 1,356. Other identified applications include neutron sources, isotope production and industrial heat. The document counts describe the distribution of activity across these applications, while practical deployment depends on solving reactor engineering, plasma control and energy-delivery challenges.