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Salary
$50k – $76k per year
Location
In office (Devens)
Seniority
Intern
Employment
Internship

Confirmed on the employer's own hiring board on Nov 5, 2026. First seen by Alion on Oct 27, 2026. Commonwealth Fusion Systems scores A on the Alion truth index.

Overview
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Commonwealth Fusion Systems is a commercial fusion energy company headquartered in Devens, Massachusetts, and founded in 2018. The firm specializes in the development of high-temperature superconducting magnets and compact tokamak devices, specifically the SPARC net-energy machine and the ARC commercial power plant. It operates through a strategic partnership with the Massachusetts Institute of Technology and focuses on scaling fusion technology to provide carbon-free, baseload power to global energy markets.

Join the power movement as a Plasma Physics Intern

The plasma physics department at CFS is looking for a summer intern to join the plasma digital twin team for 2027. We encourage both undergraduate and graduate applicants, as this internship will be tuned to match the candidate’s current skill set and education level. This internship will consist of 1-2 projects, selected from several potential project options by the intern at the onset of the internship. Given the recent advancements with LLMs and agentic AI, projects that address questions at the intersection of AI and physics are likely. Students studying all branches of plasma physics are encouraged to apply, as well as students with backgrounds applying machine learning or AI to physics problems.

Program Details:

  • 13-18 week internship
  • 40-50 hours per week with set hourly salary based on year in school
  • Opportunities on site in Devens, MA. If an intern is going to be on site, you will be responsible for your own transportation and housing
  • Specific project assignments and required technical skillset will vary based on the team’s existing need.
  • Opportunities available for currently enrolled college students in all levels of schooling from bachelor’s degree to PhD
  • Interns must be authorized to work in the United States for any employer

What you'll do:

    Responsibilities could include any combination of the following:

  • Perform plasma physics calculations for SPARC and/or ARC, using computational models or experimental datasets
  • Develop new computational modules that will be used in the SPARC digital twin (a computational model of SPARC plasmas and machine components), including physics and engineering models
  • Develop AI workflows to accelerate complex physics calculations using surrogate models
  • Develop data visualization methods to display complex plasma physics data inside the digital twin

What we’re looking for:

    • Pursuing an engineering degree with focus in the field of in plasma physics, or a related field (engineering, computer science, etc.)
    • Introductory knowledge of plasma physics, specifically tokamaks and magnetic confinement fusion
    • Knowledge of using agentic AI (Claude, ChatGPT, etc.) for coding and scientific research
    • Experience with Python, C++, or similar
    • Version control with git or similar
    • Excellent writing and technical communication skills

Must-have Requirements:

  • Willingness to travel or work required nights/weekends/on-call occasionally
  • Perform activities such as typing, standing, or sitting for extended periods of time
  • Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
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