Researchers Confirm Helicon Current Drive in Tokamak

A new study demonstrates plasma heating and current drive using a novel antenna design in a San Diego fusion facility.

Updated on Oct. 30, 2026 in Nuclear

Wide shot of the complex metallic interior of a toroidal tokamak fusion reactor. — Researchers at the DIII-D National Fusion Facility in San Diego have confirmed the feasibility of helicon current drive for plasma heating in fusion reactors. AI Illustration. Upload story photo >

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Researchers at the DIII-D National Fusion Facility have successfully confirmed the feasibility of helicon current drive in a tokamak. The team demonstrated plasma heating by using a comb line antenna to drive currents within the plasma.

Why it matters

Achieving steady-state operation is critical for fusion reactors because it reduces damage from cyclic thermal stresses compared to traditional pulsed methods. Supplemental current drive is a necessary component to maintain these steady-state conditions in long-term reactor operation.

The study utilized a specialized comb line antenna to launch helicon waves into the plasma. Researchers employed advanced measurement techniques to observe and confirm the resulting plasma heating and current drive behavior.

The players

DIII-D National Fusion Facility

This is a magnetic fusion research facility located in San Diego that focuses on advancing the understanding of plasma physics.

Bob Pinsker

He is a researcher and one of the joint first authors of the paper confirming the helicon current drive results.

Physical Review Letters

This is a peer-reviewed scientific journal that publishes high-impact research findings across all areas of physics.

The details

The experimental results, published in Physical Review Letters, detail how the team successfully utilized the comb line structure to achieve effects that previously failed in the 1980s. The researchers aim to increase power in future experiments to better understand how this current drive behaves across different plasma regimes.

1980s: Previous attempts to demonstrate helicon current drive were unsuccessful.
October 30, 2026: Researchers published the experimental results in Physical Review Letters.

The Big Picture

This validation marks a significant shift in tokamak plasma control, moving past the limitations observed in 1980s-era experiments. The success of the helicon current drive provides a new path for achieving the steady-state conditions required for future fusion reactors.

The confirmation of helicon current drive could lead to more efficient and durable designs for future fusion power plants. Successfully mastering these plasma control techniques is a vital step toward the long-term commercialization of fusion energy.

The takeaway

This breakthrough provides a new tool for managing plasma in fusion reactors, potentially increasing the lifespan of future energy systems. Scientists will now focus on scaling power levels to determine how this technology performs under the rigorous demands of a steady-state reactor.