Diagnostic Mechanical Engineer

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 over $2 billion in capital – more than any other fusion energy company in the U.S.

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 Diagnostic Mechanical Engineer

The design of the SPARC facility is continually advancing, including the design of instrumentation that will be used to control the plasma and deliver the scientific data necessary to inform the design of ARC. The SPARC Diagnostic system is comprised of over forty sub-systems that use a variety of proven techniques to encode information from a tokamak plasma into measurable signals; active laser based measurements, passive and active analysis of microwave-band emission, spectroscopy of plasma emission from the x-ray to infrared, characterization of neutrons produced from fusion reactions, and a wide variety of wired sensors and probes integrated into the vacuum environment. Techniques have been demonstrated by decades of government-sponsored fusion research, and CFS is looking for multidisciplinary engineers who can contribute to innovative design and engineering solutions to endure these concepts can be integrated into the SPARC tokamak. Candidates that have design, build, or analysis skills in the mechanical, civil, or aerospace engineering disciplines are encouraged to apply. The SPARC diagnostic team welcomes engineers looking for a career transition who want to join a team with diverse backgrounds and can solve challenging problems in the growing fusion energy industry. Candidates will work alongside CFS staff, MIT-PSFC partners, and fusion community collaborators from around the world to design and build the tools that will control the SPARC plasma and measure net energy from a tokamak for the first time. 

• Support the diagnostic systems in the design of components by applying multi-disciplinary engineering and design skills to a variety of diagnostic systems
• Contribute to a strong safety culture while helping to commission and operate SPARC diagnostics
• Grow expertise that helps CFS build a core competency in fusion measurement tools that can deliver future tokamaks optimized for power production

• Large ~5m tall structures, towers, and weldments which provide support and precision locating features for 10’s - 1000’s of kg of diagnostic equipment
• Packaging and assembly constrained piping and wiring components that can interface from sensors and tokamak systems to signal processing equipment
• Radiation shielding to help increase the lifetime of sensitive equipment
• Support and interfacing structures for scientific measurement tools that use a ~375m^2 dedicated laboratory space next to the SPARC tokamak

• Detailed component design and assembly layout in CAD
• Development of assembly and installation procedures for large assemblies
• Rapid prototyping and design of benchtop and rackmount parts that interface custom SPARC components to COTS equipment 
• Structural, civil, and thermal analysis
• Collaboration with other CFS teams and external vendors to verify design functionality and manufacturability
• Developing and executing benchtop tests of prototypes
• Supporting the resolution of technical issues that arise during the manufacturing of SPARC diagnostic equipment
• Providing hands on support for diagnostic assembly and calibration, providing feedback on the impact of field changes during installation

• At least a bachelor’s degree in a relevant engineering field (mechanical, civil, nuclear, or aerospace)
• Demonstrated record of design of structural assemblies requiring high strength and/or complex assembly operations
• Understanding of design for manufacture principles for relevant manufacturing methods such as machining, welding, concrete fabrication, or lifting/rigging
• Experience with rapid prototyping, and failure testing used to debug and improve designs
• Familiarity with all steps in the design process with an emphasis on creativity and simplicity
• Be self-motivated and exhibit excellent problem solving skills

• Experience with structural or thermal analysis
• Experience with design using NX and Teamcenter for CAD and drawings
• Familiarity in the design of metallic structures and weldments
• Bias toward design for manufacture and experience working with vendors and fabricators to reduce cost and lead time
• Design of platforms, enclosures or support structures for medium-sized, sensitive equipment
• Experience with creation of piping and instrumentation diagrams
• Attention to detail with an ability to pivot between topics multiple times per day
• An ability to clearly express and critique ideas

• Ability to occasionally lift up to 50 lbs
• Perform activities such as typing, standing, sitting for extended periods of time
• 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
• Willing to occasionally travel or work required nights/weekends/on-call

#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.