Commonwealth Fusion Systems

Commonwealth Fusion Systems

Commonwealth Fusion Systems is a Cambridge, Massachusetts-based research and development company developing fusion power systems based on ARC tokamak reactors.

Commonwealth Fusion Systems is a technology company developing fusion power systems based on ARC tokamak reactors that is headquartered in Cambridge, Massachusetts and was founded in 2017 by Martin Greenwald and Bob Mumgaard. Commonwealth Fusion Systems was spun out of the Massachusetts Institute of Technology and their Plasma Science and Fusion Center in 2007. They continue to collaborate with MIT's Plasma Science and Fusion Center to use their research into fusion technology.

Fusion Reactor

Commonwealth Fusion Systems is working on designing and building commercial fusion energy machines through magnet technology. Their design includes a high-power superconducting magnet used to create conditions necessary for sustained fusion reaction. The reactor uses hydrogen isotopes kept under extreme pressure using the superconducting magnets to sustain the reaction and contain the resulting energy. For the reaction to occur, the hydrogen fuel source needs to be heated to tens of millions of degrees.

In September 2020, Commonwealth Fusion Systems published seven peer-reviewed papers validating their approach to commercial fusion energy. Part of these papers included the design of their SPARC system, which works to provide a net energy fusion system. The SPARC reactor is a tokamak reactor, similar to an ITER tokamak reactor which should enable a similar performance as an ITER tokamak reactor but at ten times smaller and on a faster timeline. The SPARC reactor is intended to move towards a viable commercial fusion power plant called ARC.

In part of their development of SPARC, Commonwealth Fusion Systems and MIT's Plasma Science and Fusion Center have collaborated on the manufacturing of a successful 20 Tesla, large-bore magnet by 2021.


Part of the construction of the fusion reactor involves the design and manufacture of Commonwealth Fusion Systems VIPER cable. This was a joint project between Commonwealth Fusion Systems and MIT's Plasma Science and Fusion Center. And the VIPER cable is a high-temperature superconductor cable that can be engineered into magnets directly. The cable can carry currents exceeding 50kA at magnetic fields exceeding 10 T. Further, the cable was tested under extreme electromagnetically induced mechanical forces to ensure there would be minimal performance degradation and ensure the cable would be resilient against the "quench" fault condition; the "quench" condition would cause the cable to lose its superconducting properties.


October 29, 2020

Commonwealth Fusion Systems awarded U.S. Department of Energy grants in collaboration with national labs.

October 7, 2020

Commonwealth Fusion Systems have designed, built, and demonstrated a new high-temperature superconductor (HTS) cable that can be engineered into magnets applicable to the high magnetic field approach to fusion.

September 29, 2020

Commonwealth Fusion Systems announced a series of seven papers published and peer reviewed in a special edition of the Journal of Plasma Physics validating CFS' approach to commercial fusion energy.

May 27, 2020

With $84 million in funding, Commonwealth Fusion is on track for a demonstration fusion reactor by 2025.

June 27, 2019

Commonwealth Fusion Systems raises $115M and closes Series A

March 9, 2018

MIT and newly formed company, Commonwealth Fusion Systems, launch novel approach to fusion power.

Funding rounds

Funding round
Funding type
Funding round amount (USD)
Funding round date
Commonwealth Fusion Systems Series A, June 2019
June 2019
3 Results
Results per page:
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Bob Mumgaard

Founder & CEO

David Chavarria Mendoza

Electro Mechanical Engineer Manufacturing

Jan Schroeder

Head of Document Control & Records Management

Michael Segal

Academic and Strategic Partnerships

Paul Costa

Talent Acquisition

Tancredi Botto

Technical Consultant

Further reading


Commonwealth Fusion Systems Closes $115M Series A, Makes Our Inner Sci-Fi Nerds Happy


June 28, 2019

Documentaries, videos and podcasts


EnergySource Innovation Stream with Commonwealth Fusion Systems

September 30, 2020




Jonathan Shieber
May 27, 2020
Commonwealth Fusion Systems closed on its latest $84 million in new funding two weeks ago. The U.S. was still very much in the lockdown phase and getting a deal done, especially a multi-million dollar investment in a new technology aiming to make commercial nuclear fusion a reality after decades of hype, was "an interesting thing" [...]
May 26, 2020
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Srividya Kalyanaraman
May 26, 2020
The company promises to bring fusion power to market in 15 years.


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