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ITER and China’s BEST are both experimental tokamaks, but they are not equivalent projects—and “China’s best” is not an established ranking. BEST is the name of a specific Chinese device, the Burning plasma Experimental Superconducting Tokamak. ITER is an international experiment in France; China’s wider program also includes other operating experiments, technology work, and planned reactor concepts. The meaningful comparison is what each project is intended to demonstrate, not which one is “best.”
What are ITER and BEST designed to do?
ITER: investigate burning plasma and integrated reactor technologies
ITER is being built in southern France as an international experimental tokamak. Its primary scientific objective is to investigate and demonstrate a burning plasma: one in which the helium nuclei produced by fusion reactions supply enough energy to help maintain the plasma’s temperature, reducing or eliminating the need for external heating.
ITER’s stated performance target is 500 megawatts (MW) of fusion power from 50 MW of external plasma heating, or a plasma gain target of Q=10. Here, Q means fusion power divided by external heating power delivered to the plasma. It is not a measure of the entire facility’s electricity balance: it does not include all the power used to operate the machine and its systems.
ITER says it will not convert its fusion output into electricity. Its purpose is to test plasma behavior and integrated technologies relevant to future fusion plants, rather than to operate as a power station. These goals are described by the ITER Organization on its official project and goals pages.
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BEST: a Chinese burning-plasma experiment
BEST stands for Burning plasma Experimental Superconducting Tokamak. It is a Chinese experimental device described by the ITER Organization as part of the country’s pathway toward future fusion energy. The available project descriptions do not establish that BEST is “China’s best” under any stated performance measure, nor do they make it a direct substitute for ITER.
How does China’s wider fusion pathway fit together?
China’s program is not a single reactor project. Its documented pathway combines physics experiments, engineering design, technology development, and future reactor concepts. The roles should not be collapsed into a head-to-head contest between ITER and BEST.
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| Project | Role described in the cited official materials | What that means for comparison |
|---|---|---|
| ITER | International experimental tokamak focused on burning plasma and integrated technology demonstration. | An experiment, not an electricity-generating plant. |
| EAST and HL-2M | Chinese experiments contributing to the physical verification needed for CFETR, according to Chinese program material. | Part of the physics basis for later projects, not the same project stage as a DEMO-level device. |
| CFETR | An engineering test reactor receiving detailed engineering design effort in the Chinese program material. | A later engineering and test step; the cited sources do not give a current construction schedule. |
| CRAFT | A technology effort that the ITER Organization describes as exploring areas including superconducting magnets and divertors. | Technology development, rather than a direct performance counterpart to ITER. |
| BEST | A burning-plasma experimental superconducting tokamak. | An experiment within the broader pathway; its name does not establish a ranking. |
| CFEDR | A planned DEMO-level device intended as a bridge toward commercial fusion power plants. | A future concept with stated targets, not achieved performance. |
China’s program material describes EAST and HL-2M as supporting physical verification and identifies CFETR engineering design as a central objective. The ITER Organization’s “After ITER” overview separately describes CRAFT’s technology work and CFEDR’s planned role. These sources describe different projects and stages; they do not provide a common current performance score for ranking them.
How do their performance goals compare?
| Measure or mission | ITER | China’s pathway in the cited sources |
|---|---|---|
| Fusion power | Target: 500 MW of fusion power. | For planned CFEDR, the ITER Organization states a target of 1.5 to 3 gigawatts (GW) of fusion power. |
| Plasma gain | Target Q=10: 500 MW fusion power from 50 MW of external plasma heating. | For planned CFEDR, stated target Q=15 to 30. |
| Electricity generation | Will not convert its fusion output into electricity. | CFEDR is presented as a bridge toward commercial plants; the cited overview does not specify CFEDR’s net electric output. |
| Tritium and fuel cycle | Will test mock-up breeding blankets and the feasibility of producing tritium from lithium. | CFEDR’s stated objectives include tritium self-sufficiency. |
| Project stage | Experimental international tokamak. | A sequence spanning operating physics experiments, engineering and technology work, BEST’s burning-plasma experiment, and the planned CFEDR DEMO-level device. |
The CFEDR figures are plans reported by the ITER Organization, not operating results. They describe a later-stage device, so comparing its targets directly with ITER’s experimental target without accounting for project stage can mislead. Neither the larger CFEDR target nor ITER’s Q=10 target alone establishes which project will deliver electricity sooner or achieve commercial viability.
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ITER’s breeding-blanket work is also a test, not a claim that the facility will achieve tritium self-sufficiency. The projects address fuel-cycle questions at different levels: ITER will test blanket concepts, while self-sufficiency is a stated objective for planned CFEDR.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are the current timeline claims?
ITER: a revised sequence, but no calendar dates on the cited overview
The ITER Organization’s “What will ITER do?” page says a revised project baseline was presented in 2024 and approved. It describes a sequence rather than calendar milestones: a Start of Research Operation phase using hydrogen and deuterium-deuterium plasmas, followed by a limited-fluence deuterium-tritium phase (DT-1), then a machine upgrade for a more extensive DT-2 phase intended to complete project goals, including Q=10. That overview does not give calendar dates for these phases.
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An older schedule should not be mistaken for the current baseline. A China ITER program schedule archive entry dated 10 September 2018 reported that the ITER Council had approved a schedule at the end of 2016 with “First Plasma in the end of 2025.” That is a historical milestone from the earlier schedule, not a current forecast.
China: BEST has a stated expectation; later project dates are not established here
The ITER Organization’s “After ITER” overview says BEST was expected to be completed in 2027. The overview has no stated publication date, so that figure is a project expectation reported on the page, not confirmation that completion has occurred or an independently verified current milestone.
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The cited Chinese program material and ITER overview do not establish current construction dates for CFETR or CFEDR. Their roles and goals can be compared, but a reliable date-by-date schedule comparison cannot be made from these sources.
Quick Recap
What is the fairest way to compare them?
- Compare ITER with BEST as experimental devices, while keeping their different stated missions in view.
- Compare ITER’s Q=10 and 500 MW target with CFEDR’s stated Q=15–30 and 1.5–3 GW targets only as targets for projects at different stages—not as measured results.
- Include the rest of China’s pathway: EAST and HL-2M support physics work; CFETR is an engineering test-reactor effort; CRAFT explores technologies; and CFEDR is planned as a DEMO-level bridge.
- Separate plasma performance from plant performance. ITER’s Q is a plasma-heating ratio, not whole-facility electrical gain, and ITER will not generate electricity from its fusion output.
- Treat schedules as date-sensitive. The approved 2024 ITER baseline overview gives phases without dates, while the 2027 BEST figure is an undated-page expectation and the 2025 ITER first-plasma milestone belongs to a historical schedule.
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