Summary of the project

Muon‑catalyzed fusion (µCF) is a technology in which fusion reactions are induced by muons—an elementary particle. Unlike conventional fusion approaches, µCF does not require extreme reactor core conditions such as ultra‑high temperatures or pressures, and is instead highly compatible with existing technological infrastructures (Fig. 1).
This project aims to establish the scientific foundation for Advanced µCF, a high‑efficiency form of muon‑catalyzed fusion capable of achieving a net‑positive energy balance, by dramatically enhancing the fusion‑reaction efficiency mediated by muons. By 2050, the project envisions contributing to a sustainable society in harmony with the global environment through decentralized power sources, neutron‑source applications, and other diversified uses.

Unlike other fusion methods, µCF does not require plasma states; instead, it realizes fusion in low‑temperature, high‑density regimes. Leveraging these unique characteristics to the fullest, the project aims to enable practical societal deployment of fusion energy.

Fig. 1. Comparison of temperature–density regimes for different fusion approaches.

Milestone by year 2034

By 2034, the project will demonstrate the feasibility of achieving a net‑positive energy balance through Advanced µCF and will scientifically clarify the physical conditions and control techniques required for the efficient production, capture, and transport of muons.
In addition, engineering considerations will be incorporated to complete the conceptual design of a compact µCF reactor. A roadmap for applications such as decentralized power sources and neutron‑source systems will also be presented, enabling the project to reach a stage at which development of a prototype reactor can begin.

Milestone by year 2029

By 2029, the project will elucidate, through both theoretical and experimental approaches, the physical conditions and reaction mechanisms required to enhance the reaction efficiency of Advanced µCF. A system for handling deuterium and tritium, together with the associated safety‑operation requirements, will be established to provide the foundation for demonstration experiments. Using high‑precision X‑ray detection techniques, the quantum processes accompanying µCF reactions will be directly observed, enabling experimental validation of the reaction model and confirming the validity of the reaction mechanisms.
Through these achievements, the project will extract the key physical and engineering parameters necessary for future studies of an Advanced µCF reactor and will establish the foundation for integrated reactor design beyond 2034.