TECHNOLOGY
Technology to recreate the sun’s mechanism on Earth
Helical Fusion aims to recreate on Earth the principle that makes stars shine. This requires a way to confine and sustain ultra-hot plasma (over 100 million °C) efficiently and stably for long durations.
To control this extreme environment, we adopt Japan’s “helical” approach. Its form and design philosophy mirror vortices and spirals in nature—beautiful, rational stability. Within this structure, magnetic fields, heat, fluids, and materials work together to form the foundation for next-generation continuous energy.
FUSION ENERGY
What is fusion?
Fusion is when light atomic nuclei, such as hydrogen isotopes, combine to form a heavier nucleus. In that moment, enormous energy is released.
For example, when deuterium and tritium are heated to extreme temperatures and fuse into helium, just 1 gram of fuel can release energy equivalent to 8 tons of oil.
Massive output from tiny fuel—
that is the essence of the power we aim to recreate.
ヘリカル型核融合炉
Helical Stellarator
The key feature is the ability to
generate and maintain a stable magnetic field.
In a Helical Stellarator, twisted magnetic field lines wrap plasma in a balanced way, enabling long, stable operation. With high energy efficiency and continuous power output, it is well-suited as industrial baseload—supporting daily life and the economy.
By reproducing the stability of natural spirals, humanity can bring “stellar energy” under control—this is the core of the technology.
Paper: “Development of steady-state reactor by Helical Fusion” — J. Miyazawa et al., Physics of Plasmas.
CORE
TECHNOLOGY
Our technology development is
more than designing a generator.
It is the challenge of recreating and
controlling nature’s forces by human hands.
We will make real the day this spiral-born light powers future industry, cities—and beyond.
高温超伝導マグネット
High-Temperature Superconducting Magnet
To confine fusion plasma, we need powerful magnetic fields—
without sacrificing plant economics.
HTS magnets are the core component that delivers both.
Compared with “low-temperature” superconductors (superconducting around -269°C), “high-temperature” superconductors can operate below about -240°C and generate higher fields. This temperature difference materially affects cooling efficiency and plant economics through system size. However, HTS materials are difficult to process, and building large magnets is a global challenge.
ブランケット兼ダイバータシステム
Blanket & Divertor System (Liquid Metal Blanket)
The blanket—inner wall of a fusion reactor—faces the plasma directly.
It serves as a protective wall against heat and high-energy neutrons,
and also as a core system that extracts energy and regenerates fuel inside the device.
For 24/7 commercial operation, it determines plant lifetime and uptime—
an essential element of commercial operation.
In the Helix Program, we adopt a proprietary liquid metal blanket for implementation and demonstration toward Helix KANATA. By covering the most damage-prone plasma-facing region with a flowing liquid metal layer, we aim for a self-refreshing, “self-healing” structure.
Using the world’s first demonstration device “GALOP,” we aim to establish a rational system that achieves both stable liquid-metal circulation and high safety and reliability.
For the breeding blanket portion that requires periodic replacement, we design a modular structure that can be exchanged using only an overhead crane—minimizing maintenance time while achieving high uptime and strong plant economics.
An energy circulation system that enables power generation, long-term operation, safety, maintainability, and coexistence with the environment—this is the goal of our liquid metal blanket development.
