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Helios stellarator analysis finds a near-ignited plasma scenario

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Research area:physics-astronomyplasma-physics

What the study found

The study found that a near-ignited scenario for the Helios stellarator fusion power plant can be identified. In that scenario, the model predicts 945 MW of fusion power and a fusion gain of 47.

Why the authors say this matters

The authors present the analysis as part of understanding the transport properties and profile prediction for the preconceptual Helios design. The findings suggest the modeled plasma conditions are close to ignition, with performance values compared against reference targets.

What the researchers tested

The researchers used a multi-scale framework that includes turbulent timescales in macroscopic profile evolution on transport timescales. They ran high-fidelity electrostatic gyrokinetic and drift-kinetic calculations to simulate transport fluxes, using a prescribed density profile and including alpha heating power, auxiliary electron heating, radiation losses, and collisional energy exchange.

What worked and what didn't

The analysis found a steady-state temperature profile for a near-ignited scenario. It reported P fus = 945 MW, Q fus = 47, H ISS04 = 1.34, and a Sudo density fraction of 1.25, which the authors compare with reference values of 958 MW, 1.4, and 1.1, respectively. Additional calculations with fully kinetic impurities showed a strong reduction in gyrokinetic heat and particle fluxes for the bulk ions.

What to keep in mind

The abstract describes a preconceptual design study, so the results are model-based rather than experimental. It also notes that the density profile was prescribed, and the provided summary does not describe further limitations.

Key points

  • A near-ignited Helios scenario was found in the modeling study.
  • The modeled case predicts 945 MW of fusion power and a fusion gain of 47.
  • The reported confinement scaling factor was H ISS04 = 1.34.
  • The Sudo density fraction was 1.25, above the reference value cited in the abstract.
  • Fully kinetic impurities strongly reduced gyrokinetic heat and particle fluxes for bulk ions.

Disclosure

Research title:
Helios stellarator analysis finds a near-ignited plasma scenario
Authors:
Mike F. Martin, Charles Swanson, Daniel Dudt, I. Cho, J.J. Frybes, S. T. A. Kumar, D. Gates
Institutions:
United States Department of Energy, United States Department of Energy, United States Department of Energy, United States Department of Energy, United States Department of Energy, United States Department of Energy, United States Department of Energy
Publication date:
2026-06-30
DOI:
10.1016/j.fusengdes.2026.115902
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

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