Scientist - Scenarios and Integrated Modeling

Commonwealth Fusion Systems

1050

Devens, MA, United States

Posted on: 2025-10-31

Category: renewables

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Employment type:

Full time

Experience required:

Intermediate

Salary

Salary not provided

About the company:

Commonwealth Fusion Systems (CFS) is on a mission to deliver clean fusion energy to the planet fast enough to matter for humanity’s biggest challenges.

It’s urgent. The gap between the energy we need and the energy we have is widening every day. Fusion is a critical part of the energy transition away from fossil fuels, a new chapter for the world’s energy supply.

We’re committing to delivering fusion power plants and a full-fledged fusion energy industry as we’ve delivered on other promises. Like the world’s strongest high-temperature superconducting magnet, the game-changing technology that’s making commercial fusion energy a reality.

We’ve raised over $2 billion in capital — more than any other fusion energy company — and attracted top talent to design, build, and deliver commercial fusion power plants. And we’re working with policymakers and suppliers to make fusion energy available globally.

As we push toward the fusion-energy future, we’ll keep setting and meeting milestones, sharing and validating our progress, and encouraging others to do the same.

About Commonwealth Fusion Systems:

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Scientist - Scenarios and Integrated Modeling

Scientist - Scenarios and Integrated Modeling will develop plasma physics scenarios for SPARC and ARC based on comprehensive integrated simulation and modeling of the core and edge plasma. Will coordinate with a multi-institutional team of plasma physics experts to develop and improve an integrated modeling toolset, and to employ that toolset for experimental planning and analysis on SPARC.

Commonwealth Fusion Systems is assembling the high-field SPARC tokamak, which aims to be the first magnetic fusion device to achieve net fusion energy, and is predicted to be able to achieve high gain and fusion power up to 140MW. In parallel CFS is designing and optimizing the ARC fusion power plant, the first of which will be built in Virginia in the early 2030s. To achieve SPARC’s goals and validate the physics understanding necessary for optimizing ARC, we plan to develop and continuously improve a comprehensive predictive toolchain, including all physics capabilities needed to evaluate plasma scenario performance and robustness. The person in this role will coordinate and contribute to the development and testing of this toolchain, and its use in planning and executing experiments on SPARC, as well as in development and optimization of future power plants. The person in this role will also play a key role in defining plasma operation goals, identify optimal operation scenarios for each goal, and participate directly in execution and analysis of SPARC operations.

#LI-Hybrid

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

What you'll do:

Refine, optimize, and validate a comprehensive integrated modeling toolset capable of predicting plasma performance and dynamics

➢ Toolset will include models of: core turbulent and neoclassical transport, H-mode pedestal and L-mode edge, coupling to boundary, ICRH heating, energetic particle physics, MHD stability, and impurity transport

➢ Toolset will include very rapid execution workflows appropriate for control, rapid execution workflows appropriate for experiment planning and optimization, as well as higher fidelity models for offline analysis and deeper exploration of critical physics

Work closely with a multi-institutional team of experts to incorporate state-of-the-art physics capabilities, and validate models

Employ integrated modeling tools to plan and execute plasma pulses to achieve key goals including net fusion power on SPARC, and continuously improve toolset as new data becomes available

Identify, execute, and continuously improve operational scenario for achieving SPARC goals

Work closely with physics, diagnostics, operations, plasma control, and software teams to design and execute plasma scenarios on SPARC

Contribute to physics design and optimization of ARC

What we’re looking for:

PhD in plasma physics or a closely related discipline

Minimum 2 years post-PhD experience in magnetic fusion

Significant experience with fusion plasma simulation and modeling software

Significant experience in planning, executing, and/or analyzing fusion experiments

Expertise in magnetic fusion experiment and simulation

Strong insight on physics issues associated with integration of regions (core, edge, boundary) and physics (transport, MHD, heating, plasma material interaction..) in magnetic fusion systems

Strong teamwork skills

Ability to communicate ideas and results clearly

Results focused with understanding of the fusion goal

Ability to think clearly and perform well under pressure

Bonus points for:

5+ years post-PhD experience, including hands-on experience planning and executing magnetic fusion experiments, and experience using and developing fusion simulation codes

Fusion experiment planning and control room experience

Familiarity with tokamak simulation tools including core transport models, pedestal/edge models, boundary models

Experience with plasma transport codes such as TRANSP, IPS-FASTRAN, ASTRA, JINTRAC, TGYRO.

Failiarity with ICRF physics and operation

Familiarity with MHD physics, and impact of non-axisymmetric fields

Failiarity with tokamak plasma breakdown, rampup and rampdown

Experience developing fusion simulation codes

Experience integrating simulation tools into a robust toolchain

Familiarity with Python, C++, Fortran, and git version control

Experience with broad based fusion collaborations, ideally including international collaborations

Must-have Requirements:

Perform extended activities such as typing, standing, sitting, etc.

Willingness to travel or work required nights/weekends/on-call regularly

Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

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