Helion• Feb 13, 2026• 6:09

Helion hits new fusion milestone: D-T fusion and 150M°C plasma temperatures

From Helion

Executive Summary

A private fusion company successfully completed its first deuterium-tritium (D-T) testing campaign in its Polaris prototype, a major milestone.
The experiments achieved plasma temperatures exceeding 150 million degrees and set multiple world records for fusion, achieving D-T fusion on the first operational shot.
Results validated the company's plasma scaling laws for Field-Reversed Configuration (FRC) plasmas, increasing confidence in their path to a commercial power plant.
The company is the first private entity licensed to handle tritium, demonstrating significant operational and regulatory maturity which de-risks future development.

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Concerns Raised

Safety and handling protocols for radioactive tritium fuel.
Potential for discovering unknown physics that could negatively impact the path to a power plant.

Opportunities Identified

Pushing the Polaris prototype to even higher performance levels.
Leveraging validated scaling laws to design and build the next generation of machines for grid-scale electricity production.
Using D-T fusion as a stepping stone to develop more advanced helium-3 fusion.

Key Themes

Scientific Model Validation

The D-T experiments successfully confirmed the company's plasma scaling laws, which were previously observed in earlier prototypes. This validation at higher performance levels demonstrates that their understanding of FRC plasma physics holds under more extreme conditions.

This de-risks the development of future, more powerful machines, as it provides a predictable physics-based foundation for designing a commercial-scale fusion power plant.

Operational Excellence and Execution

The team's extensive preparation, including drills and procedure reviews, enabled them to achieve all primary test objectives on the first day of a multi-day campaign. This efficiency allowed for additional, unplanned experiments that pushed the machine's performance and yielded further learning.

Demonstrates a high level of engineering and operational maturity, which is critical for handling complex and hazardous materials like tritium and for executing ambitious R&D timelines.

Pioneering Private Fusion

The company has established itself as a leader by becoming the first private fusion entity to be licensed for and conduct D-T fusion experiments. This achievement, coupled with setting performance records, marks a significant step forward for the entire commercial fusion industry.

This milestone builds credibility and signals to investors, partners, and regulators that private companies are making tangible, record-setting progress toward commercially viable fusion energy.

Iterative and Rapid Prototyping

Polaris is the company's seventh-generation prototype, a product of a development cycle that implements learnings on a timescale of years rather than decades. This rapid, iterative approach has been key to their accelerated progress and ability to tackle advanced fuel cycles.

This agile development model allows the company to learn and advance much faster than traditional, large-scale public fusion projects, potentially shortening the timeline to a functional power plant.

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Topics

Fusion Energy Private Fusion Nuclear Fusion Deuterium-Tritium Fusion Plasma Physics Field-Reversed Configuration (FRC)Polaris Prototype Energy Technology Scientific Milestones Tritium Handling Plasma Scaling Laws R&D Prototyping High-Temperature Plasma Clean Energy

Processed Apr 20, 2026 yt-dlp + mlx-whisper + Gemini