Terra Fusion Reused MRI Magnets for Reactor Research
The Baltimore startup seeks to achieve fusion breakeven by 2029 using low-cost magnetic mirror technology.
Updated on Sept. 23, 2026 in Nuclear
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Should private startups using repurposed parts receive more focus for achieving fusion energy breakthroughs?
Founded in 2024, Terra Fusion is advancing a plasma reactor design that repurposes MRI machine magnets to lower infrastructure costs. The firm builds upon the Maryland Centrifugal Experiment (CMFX) research, which has already demonstrated a partial realization of required fusion conditions.
Why it matters
The company’s approach attempts to sidestep the immense capital requirements of traditional toroidal tokamak reactors by utilizing simpler magnetic mirror architectures. This shift comes as the broader fusion industry saw $4.5 billion in funding over the past year.
The CMFX experimental setup generated a magnetic field strength of 3 Tesla using two repurposed Philips MRI magnets. While the experiment successfully hit one-tenth of the temperature, density, and confinement time required for fusion, the company targets 100 megawatts for future modules.
The players
Terra Fusion
A Baltimore-based startup developing modular fusion reactors using repurposed medical imaging hardware.
University of Maryland
A research institution that hosted the Maryland Centrifugal Experiment to study plasma rotation and confinement.
ARPA-E
The U.S. Department of Energy agency that funds high-risk, high-reward energy technology research.
The details
The reactor utilizes a central electrode to accelerate plasma to supersonic speeds, creating a rotating state. This rotation generates centrifugal force, which serves to balance the internal plasma pressure against the external magnetic pressure. Magnetic mirrors offer a more compact, lower-maintenance configuration compared to the massive, doughnut-shaped tokamak reactors commonly used in current international fusion research.
Timeline
1986: The largest magnetic mirror reactor was mothballed.
2004-2010: Researchers operated the Maryland Centrifugal Experiment.
2020: Terra Fusion received a $5.2 million ARPA-E grant.
2024: Terra Fusion was formed.
2029: Terra Fusion targets fusion breakeven.
The Tech Race
Terra Fusion is competing against the multi-billion dollar path established by the ITER fusion project by pursuing a smaller, modular design. This marks a strategic departure from the massive, centralized reactor models that have dominated fusion research since the closure of major mirror experiments in 1986.
The technology is currently in a research and development phase, with no immediate commercial availability for consumers or the energy grid. Modular reactors with a 100 megawatt output are projected to reach the market in the mid-2030s.
The takeaway
The firm seeks to prove that high-performance fusion can be achieved without massive government-scale infrastructure. Investors should monitor the 2029 milestone to see if the magnetic mirror architecture successfully bridges the current performance gap.
What happens next
Terra Fusion is tracking toward a planned demonstration of scientific fusion breakeven in 2029.
Further reading
For more on the development of alternative reactor designs, visit Nuclear.
Live Poll
Should private startups using repurposed parts receive more focus for achieving fusion energy breakthroughs?
