C

Commonwealth Fusion Systems

Develops high-temperature superconducting fusion magnets

Plasma Physics Intern

Summer 2027Updated
$25 - $38/hr
Internship
Bachelor's
Devens, MA, USA
In PersonOn-site opportunity; interns are responsible for their own transportation and housing.
AI & Machine LearningApplied Machine Learning

About the job

Requirements
  • Applicants must be pursuing an engineering degree focused on plasma physics or a related field, such as engineering or computer science.
  • Applicants should have introductory knowledge of plasma physics, specifically tokamaks and magnetic confinement fusion.
  • Applicants should know how to use agentic artificial intelligence tools such as Claude or ChatGPT for coding and scientific research.
  • Applicants should have experience with Python, C++, or a similar language.
  • Applicants should have experience with version control using Git or a similar tool.
  • Applicants must be willing to travel or occasionally work nights, weekends, or on call.
  • Applicants must be able to perform activities such as typing, standing, or sitting for extended periods.
  • Applicants must be dedicated to safety in environments with potential industrial hazards, including heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics.
  • Interns must be authorized to work in the United States for any employer.
Responsibilities
  • Perform plasma physics calculations for SPARC and/or ARC using computational models or experimental datasets.
  • Develop computational modules for use in the SPARC digital twin, including physics and engineering models.
  • Develop artificial intelligence workflows to accelerate complex physics calculations using surrogate models.
  • Develop data visualization methods to display complex plasma physics data inside the digital twin.
Desired Qualifications
  • Excellent writing and technical communication skills.

About the company

C

Commonwealth Fusion Systems

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Commonwealth Fusion Systems builds fusion energy systems that use high-temperature superconducting magnets to confine plasma in tokamaks, making smaller and less expensive machines. Their SPARC project aims to produce net energy from fusion, with ARC envisioned as the first commercial fusion power plant. They sell these fusion systems to energy providers and industries that need lots of power, generating revenue from system sales. Their goal is to deliver cost-competitive, clean fusion energy to help reduce climate change, pursuing a practical, data-driven path in collaboration with MIT.

Company Size

1,001-5,000

Company Stage

Grant

Total Funding

$4B

Headquarters

Harvard, Massachusetts

Founded

2018

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Simplify's Take

What believers are saying

  • September 30, 2026 Fujikura order secured over 10,000 km HTS tape for ARC.
  • July 2026 funding reached $4 billion, giving CFS unmatched runway versus fusion peers.
  • Hyundai joined the $1 billion round on September 10, 2026, widening industrial backing.

What critics are saying

  • SPARC still lacks Q>1; missing 2027 kills ARC credibility and fundraising urgency.
  • PJM interconnection started April 2026, and Chesterfield permitting runs through years of reviews.
  • This remains a capital-hungry science project; one SPARC setback can stall the company existentially.

What makes Commonwealth Fusion Systems unique

  • CFS pairs MIT-grade physics with REBCO magnets, enabling compact tokamak designs.
  • SPARC was about 80% complete by July 2026, proving industrial execution, not just theory.
  • CFS locked Google, Eni, and Hyundai around ARC, building demand before first power.

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Benefits

  • 12.5 Company-wide Holidays
  • Our vacation policy is 'take vacation'
  • Our sick time policy is 'get better and try not to make others sick'
  • Generous parental leave policy
  • Health Reimbursement
  • Health, Dependent Care, & Limited Purpose Flexible Spending Accounts
  • Delta Dental, Blue 20/20 Vision optional
  • Wellbeing / Headspace coverage
  • Short-term & long-term disability
  • Life and AD&D insurance
  • 401K

Growth & Insights and Company News

6 month growth

0%

1 year growth

0%

2 year growth

3%
TechCrunch
Oct 23rd, 2026
CFS gets $85M US government award to develop fusion-ready chips

Commonwealth Fusion Systems (CFS) will receive $85 million from the US Department of Commerce to develop advanced chips for fusion power. The CHIPS Act award also gives the government a stake in the company. CFS plans to turn on its Sparc demonstration reactor next year. Building commercial plants will require more durable power electronics and a stronger supply chain. The money will fund five initiatives. They include silicon carbide power electronics, next-generation radio-frequency power generators for heating fusion fuel, and radiation-hardened electronics that could extend equipment life and cut operating costs. CFS also plans to adapt AI hardware such as GPUs and TPUs for power plants. "Ultimately, that means a more capable, economical power plant and a stronger US supply chain to build it," said co-founder and chief science officer Brandon Sorbom.

IntelPro
Oct 23rd, 2026
Commonwealth Fusion Systems gets $85M to build better fusion-ready semiconductors.

Commonwealth Fusion Systems gets $85M to build better fusion-ready semiconductors. Top-funded fusion startup Commonwealth Fusion Systems received an $85 million award from the federal government to advance conductors for fusion power Commonwealth Fusion Systems (CFS) announced on Thursday that it would receive $85 million from the U.S. government to develop advanced chips for the fusion power industry. Fusion power startups have been racing to complete their first demonstration devices, with CFS aiming to turn on its Sparc reactor sometime next year. But building one reactor is just a proof point. If fusion startups want to build dozens of commercial power plants, they'll need more durable power electronics and a robust supply chain. The new CHIPS Act award from the Department of Commerce, which also grants the government a stake in CFS, will help boost R&D and manufacturing capacity for semiconductors in the U.S., the company said. "Ultimately, that means a more capable, economical power plant and a stronger U.S. supply chain to build it," Brandon Sorbom, co-founder and chief science officer at CFS, wrote in a blog post. CFS's award will go toward supporting five different initiatives. The first is the advancement of silicon carbide power electronics. The semiconductors are widely used to manage high voltages, and they're found in everything from LEDs and EVs to cell phone base stations and data centers. It's also used in fusion machines, where intense bursts of electricity are used to drive the superconducting magnets that confine plasma inside a reactor. CFS will also use the award to develop next-generation radio-frequency power generators, which the company uses to heat fusion fuel, and advanced electronics that will enable faster control of the reactor and be hardened against radiation. The latter could help extend the lifespan of electronics within a fusion power plant, reducing operating costs. Lastly, CFS plans to use part of the CHIPS award to adapt AI hardware like GPUs and TPUs for power plants. "The funding would help improve the U.S. chip and power electronics industries at the same time it accelerates fusion energy's progress toward the electrical grid," Sorbom said.

American Nuclear Society
Oct 21st, 2026
Second round of Genesis Mission selections includes 12 Phase II awards.

Second round of Genesis Mission selections includes 12 Phase II awards. Fermilab engineer Yash Saxena holds a custom circuit board designed to measure chip performance in cryogenic environments. (Photo: JJ Starr, Fermilab) The Department of Energy has announced the selection of 12 new Phase II awards and six new Phase I awards through its Genesis Mission, including projects related to fusion energy and high-radiation environments. In July, the DOE announced the selection of 278 projects under the Genesis Mission, most of which were Phase I projects. Phase II awards are intended to scale up and expand projects that have already demonstrated potential for transformative scientific capability through multi-year funding. Extreme environments: Nhan Tran, a Wilson Fellow at Fermilab, is leading a Phase II project titled "AXESS: Accelerating Extreme Environment Specs-to-Silicon." It aims to accelerate the development of rugged, high-performance microchips capable of operating in extreme conditions including space, ultra-cold environments, and high-radiation settings such as fusion machines. According to Fermilab, the research team is building a framework that uses AI to speed up the chip-design process, dramatically reducing the time from chip specification to fabrication from months to weeks. It is intended to help designers make decisions throughout what is typically a multistage process that relies on slow, manually operated tools. For electronics operating in extreme environments, this can require years of specialized work. "Particle detectors must function in some of the most extreme environments in terms of radiation, cryogenic temperatures, and speed," said Tran. "As a result, we've built our own custom detectors for many years, and Fermilab has established deep expertise in microelectronics for extreme environments. More recently, we've developed tools and methods used across the community to integrate AI onto chips. All of this coming together within the Genesis Mission is a great opportunity for Fermilab to team up with others and use AI to significantly accelerate chip design." University partners include Arizona State University, Georgia Institute of Technology, Massachusetts Institute of Technology, Purdue University, the University of California San Diego, and the University of Southern California. Among the other collaborators are Lawrence Berkeley, Oak Ridge, and Sandia National Laboratories; SLAC National Accelerator Laboratory; and industry partners, including Advanced Micro Devices, Dataerai, IBM, and Siemens EDA. "Siemens is putting industrial-grade hardware design solutions behind the Genesis Mission," said David Burnette, engineering director for catapult high-level synthesis at Siemens Digital Industries Software. "By uniting Siemens's proven technologies with the breakthrough science at Fermilab and across the DOE labs, we're accelerating a new class of chips for quantum, fusion, and high-radiation environments - at a speed and scale the nation has never had." FRIB operations: Ayan Paul, a research associate professor at Northeastern University in Boston, Mass., is leading a Phase II project titled "Agentic Assistance for Advanced Rare Isotope Separator (ARIS) Operations at the Facility for Rare Isotope Beams (FRIB): Planning, Beam Tuning, Calibration, Monitoring, and Knowledge Harvesting." It will develop an agentic AI system to safely streamline the operation and tuning of the FRIB particle separator. According to Paul, weekly beam development at FRIB takes 16-24 hours, about half of which goes to manual isotope calibration. This project aims to develop three sets of AI agents to assist FRIB staff and users in planning experiments, tuning the machine, and monitoring the system. "If the project targets are met, the team projects 500 additional hours of beam time for science at FRIB each year, corresponding to several more experiments," the project abstract states. Michigan State University, where FRIB is located, and Gravitate AI are partners on this project. Fusion digital twin: Thomas Looby at Commonwealth Fusion Systems is leading a Phase II project titled "Accelerating the Path to Commercial Fusion Energy via an AI-Enabled Digital Twin Platform for SPARC." It aims to build a digital twin to simulate and optimize operations of a fusion demonstration device. CFS is a participant in the DOE Milestone Program currently developing SPARC, its tokamak prototype, and this project aims to use DOE supercomputers to process fusion data, strengthen AI tools, and advance digital twin visualization work that previously was started by CFS, Nvidia, and Siemens for SPARC. This work is expected to support and accelerate tokamak operations by creating, sustaining, and optimizing fusion plasma scenarios between experimental pulses and connect plasma behavior with lifetime performance models of plasma-facing components. While several fusion companies were selected to lead Phase I projects in the first round of Genesis Mission selections, CFS is the only private company leading a project in this second round. Collaborators include ORNL, Lawrence Livermore National Laboratory, Princeton Plasma Physics Laboratory, SLAC, MIT, Carnegie Mellon University, Ansys, General Atomics/DIII-D, Google DeepMind, and Nvidia. CFS cofounder and chief science officer Brandon Sorbom said that the project "will convert decades of R&D performed across the U.S. fusion community into tools that can be applied to accelerate SPARC operations. Together, our team of public and private leaders in AI and fusion will be able to unify and apply decades of U.S. research and tackle some of the fusion industry's biggest challenges." Waste processing: Kevin Brown, a research professor at Vanderbilt University, is leading a Phase I project titled "WasteChemAI: Chemical Speciation and Partitioning AI Framework for DOE Waste Processing and Disposal Optimization," which focuses on optimizing the chemical processing of nuclear waste. "Chemical processing for nuclear waste management and long-term demonstration of environmental safety requires detailed understanding of the behavior of chemical species and radionuclides under a range of process and environmental conditions," Brown said. "The WasteChemAI project will use machine learning and artificial intelligence to dramatically accelerate the engineering evaluation processes and provide more reliable information along with quantified uncertainty."

PR Newswire
Sep 30th, 2026
Commonwealth Fusion Systems places largest single purchase order of HTS tape with Fujikura to accelerate development of ARC power plants.

Commonwealth Fusion Systems places largest single purchase order of HTS tape with Fujikura to accelerate development of ARC power plants. Sep 30, 2026, 00:01 ET * As part of the long-term supply agreement, Fujikura is investing in the expansion of its manufacturing capacity to provide more than 10,000 km (3 GA-m) of HighTemperature Superconducting (HTS) tape to support the commercial rollout of CFS' ARC power plants. * The agreement is the largest of its kind for HTS tape, a key milestone for the ARC power plant supply chain. DEVENS, Mass. and TOKYO, Sept. 30, 2026 /PRNewswire/ - Commonwealth Fusion Systems (CFS), the global leader in fusion energy, today announced a landmark supply agreement with Fujikura Ltd. as it accelerates the commercial rollout of ARC fusion power plants. CFS agreed to purchase more than 10,000 km (3 GA-m) of high-temperature superconducting (HTS) tape from Fujikura that the company will use in the development of its ARC power plants, starting with the first grid-scale plant being developed at the Fall Line Fusion Power Station in Chesterfield County, Virginia. Fujikura is investing in the expansion of its manufacturing capacity to enable the delivery of the HTS tape at scale. The agreement is the largest of its kind for HTS tape. "This partnership with Fujikura demonstrates how we're actively placing orders and getting ready to execute our ARC power plant once our SPARC fusion machine achieves Q>1," said Bob Mumgaard, CEO and Co-founder of Commonwealth Fusion Systems. "We're pleased to find partners like Fujikura that understand our manufacturing priorities, share our sense of urgency, and are willing to make the investments necessary to help us scale so that together we can meet future demand for this crucial energy source worldwide." The supply agreement is a major milestone toward the construction of ARC power plants and will help to strengthen the industrial supply chain essential to bring commercial fusion power to market. It also marks an important step in U.S.-Japan collaboration and in building the industrial ecosystem needed to support commercial fusion energy. "With this agreement, Fujikura will continue to strengthen its position as a key supplier of HTS tape for ARC power plants while building a long-term business platform for the 2030s and beyond, when commercial fusion power plants are expected to begin operation," said Naoki Okada, Representative Director, President and CEO of Fujikura Ltd. "Through these efforts, Fujikura aims to help support a sustainable energy future." About Commonwealth Fusion Systems Commonwealth Fusion Systems is the world's largest and leading private fusion company. The company's marquee fusion project, SPARC, will generate net energy, paving the way for limitless carbon-free energy. The company has raised $4 billion in capital since it was founded in 2018. SPARC(R), ARC(TM), and Fall Line(TM) Fusion Power Station are trademarks of Commonwealth Fusion Systems(R). About Fujikura Fujikura Ltd., founded in 1885, is a global technology company with more than 100 group companies worldwide. Building on over a century of expertise in connectivity technologies, Fujikura provides advanced solutions for optical communications, electronics, and automotive applications. Today, the company supports the rapid expansion of digital infrastructure and contributes to the development of next-generation energy technologies, including fusion energy. About Fusion Energy Fusion energy is released when light atomic nuclei, such as deuterium and tritium, fuse to form another nucleus, such as helium, in a reaction similar to the one that powers the sun. One gram of fusion fuel is estimated to produce energy equivalent to burning approximately eight metric tons of oil. Fusion is attracting growing attention because it is considered the "holy grail" of energy production. It is an "always on" power source that has no emissions, is scalable, safe, and can be sited essentially anywhere. The fuel can be sourced from seawater, making it essentially unlimited and easily accessible - meaning fusion can provide permanent energy security as well. Fusion power plants that use magnetic confinement require extremely strong magnetic fields to hold plasma at temperatures of about 100 million degrees Celsius. Fujikura's HTS tape combines high current-carrying performance with high mechanical strength in intense magnetic fields, making it suitable for the powerful superconducting magnets used to confine and control the plasma. By enabling stronger magnetic fields, HTS magnets can help make fusion power plants compact, which is expected to reduce the capital costs and make commercial fusion power plants more affordable and easier to build. Fujikura has already supported CFS' research and development by supplying HTS tape. *1 High-temperature superconductors (HTS) Fujikura's HTS is based on its proprietary IBAD (Ion Beam Assisted Deposition) process, developed in 1991. It exhibits zero electrical resistance even at liquid-nitrogen temperature (−196°C) and can carry large currents despite its small cross-section. Because it maintains a high critical current even in high magnetic fields, it is an essential material for realizing compact, high-field fusion energy reactors. *2 Magnetic-confinement (tokamak) approach A torus-shaped fusion energy device that uses a strong magnetic field to confine ultra-high temperature plasma. The strong magnetic fields are generated by toroidal field coils, poloidal field coils, and a central solenoid coil, all of which use high-temperature superconductors. For Commonwealth Fusion Systems: Christine Dunn, [email protected] SOURCE Commonwealth Fusion Systems

WOWK-TV
Sep 30th, 2026
Commonwealth Fusion Systems places largest single purchase order of HTS tape with Fujikura to accelerate development of ARC power plants.

Commonwealth Fusion Systems places largest single purchase order of HTS tape with Fujikura to accelerate development of ARC power plants. Sep 30, 2026, 12:01 AM ET * As part of the long-term supply agreement, Fujikura is investing in the expansion of its manufacturing capacity to provide more than 10,000 km (3 GA-m) of HighTemperature Superconducting (HTS) tape to support the commercial rollout of CFS' ARC power plants. * The agreement is the largest of its kind for HTS tape, a key milestone for the ARC power plant supply chain. DEVENS, Mass. and TOKYO, Sept. 30, 2026 /PRNewswire/ - Commonwealth Fusion Systems (CFS), the global leader in fusion energy, today announced a landmark supply agreement with Fujikura Ltd. as it accelerates the commercial rollout of ARC fusion power plants. CFS agreed to purchase more than 10,000 km (3 GA-m) of high-temperature superconducting (HTS) tape from Fujikura that the company will use in the development of its ARC power plants, starting with the first grid-scale plant being developed at the Fall Line Fusion Power Station in Chesterfield County, Virginia. Fujikura is investing in the expansion of its manufacturing capacity to enable the delivery of the HTS tape at scale. The agreement is the largest of its kind for HTS tape. "This partnership with Fujikura demonstrates how we're actively placing orders and getting ready to execute our ARC power plant once our SPARC fusion machine achieves Q>1," said Bob Mumgaard, CEO and Co-founder of Commonwealth Fusion Systems. "We're pleased to find partners like Fujikura that understand our manufacturing priorities, share our sense of urgency, and are willing to make the investments necessary to help us scale so that together we can meet future demand for this crucial energy source worldwide." The supply agreement is a major milestone toward the construction of ARC power plants and will help to strengthen the industrial supply chain essential to bring commercial fusion power to market. It also marks an important step in U.S.-Japan collaboration and in building the industrial ecosystem needed to support commercial fusion energy. "With this agreement, Fujikura will continue to strengthen its position as a key supplier of HTS tape for ARC power plants while building a long-term business platform for the 2030s and beyond, when commercial fusion power plants are expected to begin operation," said Naoki Okada, Representative Director, President and CEO of Fujikura Ltd. "Through these efforts, Fujikura aims to help support a sustainable energy future." About Commonwealth Fusion Systems Commonwealth Fusion Systems is the world's largest and leading private fusion company. The company's marquee fusion project, SPARC, will generate net energy, paving the way for limitless carbon-free energy. The company has raised $4 billion in capital since it was founded in 2018. SPARC(R), ARC(TM), and Fall Line(TM) Fusion Power Station are trademarks of Commonwealth Fusion Systems(R). About Fujikura Fujikura Ltd., founded in 1885, is a global technology company with more than 100 group companies worldwide. Building on over a century of expertise in connectivity technologies, Fujikura provides advanced solutions for optical communications, electronics, and automotive applications. Today, the company supports the rapid expansion of digital infrastructure and contributes to the development of next-generation energy technologies, including fusion energy. About Fusion Energy Fusion energy is released when light atomic nuclei, such as deuterium and tritium, fuse to form another nucleus, such as helium, in a reaction similar to the one that powers the sun. One gram of fusion fuel is estimated to produce energy equivalent to burning approximately eight metric tons of oil. Fusion is attracting growing attention because it is considered the "holy grail" of energy production. It is an "always on" power source that has no emissions, is scalable, safe, and can be sited essentially anywhere. The fuel can be sourced from seawater, making it essentially unlimited and easily accessible - meaning fusion can provide permanent energy security as well. Fusion power plants that use magnetic confinement require extremely strong magnetic fields to hold plasma at temperatures of about 100 million degrees Celsius. Fujikura's HTS tape combines high current-carrying performance with high mechanical strength in intense magnetic fields, making it suitable for the powerful superconducting magnets used to confine and control the plasma. By enabling stronger magnetic fields, HTS magnets can help make fusion power plants compact, which is expected to reduce the capital costs and make commercial fusion power plants more affordable and easier to build. Fujikura has already supported CFS' research and development by supplying HTS tape. *1 High-temperature superconductors (HTS) Fujikura's HTS is based on its proprietary IBAD (Ion Beam Assisted Deposition) process, developed in 1991. It exhibits zero electrical resistance even at liquid-nitrogen temperature (−196°C) and can carry large currents despite its small cross-section. Because it maintains a high critical current even in high magnetic fields, it is an essential material for realizing compact, high-field fusion energy reactors. *2 Magnetic-confinement (tokamak) approach A torus-shaped fusion energy device that uses a strong magnetic field to confine ultra-high temperature plasma. The strong magnetic fields are generated by toroidal field coils, poloidal field coils, and a central solenoid coil, all of which use high-temperature superconductors. For Commonwealth Fusion Systems: Christine Dunn, [email protected] SOURCE Commonwealth Fusion Systems NOTE: This content is not written by or endorsed by "WOWK", its advertisers, or Nexstar Media Inc.