Application Guide
How to Apply for Research Scientist - Blanket Design
at Marathon Fusion
🏢 About Marathon Fusion
Marathon Fusion is at the forefront of building the fuel cycle for fusion energy, a critical yet often overlooked piece of the fusion puzzle. Unlike many fusion startups focusing on reactor design, Marathon is tackling the essential challenge of tritium breeding and handling, making them a key enabler for the entire fusion industry. Working here means contributing directly to the infrastructure that will power future fusion plants.
About This Role
As a Research Scientist in Blanket Design, you will lead the design and simulation of breeding blanket systems—the components that produce tritium and extract heat in a fusion reactor. Your work will involve integrating neutronics, thermal-hydraulics, and structural mechanics to optimize blanket performance and safety. This role is impactful because successful blanket design is a prerequisite for any commercial fusion reactor, and your innovations will directly influence the viability of fusion energy.
💡 A Day in the Life
A typical day might start with running a neutronics simulation to compute tritium production rates in a blanket design, then discussing results with the team. After lunch, you could be reviewing a test plan for a tritium permeation experiment or analyzing thermal stress in a blanket module using FEA. You'll likely end the day by documenting findings and planning next steps for model refinement or experimental validation.
🚀 Application Tools
🎯 Who Marathon Fusion Is Looking For
- Has a PhD or MS in Nuclear Engineering, Physics, or Mechanical Engineering with 3+ years of experience in fusion blanket design or related fields like fission reactor core design or accelerator target systems.
- Proficient in multiphysics modeling using tools like OpenMC, MCNP, ANSYS Fluent, COMSOL, or MOOSE, and can bridge neutron transport with thermal and structural analysis.
- Experienced in developing test plans for experimental validation, such as designing experiments to measure tritium permeation or thermo-mechanical performance under fusion-relevant conditions.
- Familiar with safety analysis methodologies (FMEA, HALT) and regulatory codes (e.g., NRC, ASME) applicable to nuclear systems, and can translate them into design requirements.
📝 Tips for Applying to Marathon Fusion
Highlight any direct experience with breeding blanket design, tritium transport, or liquid metal/ceramic breeder materials in your resume and cover letter.
Showcase your ability to use specific modeling tools (e.g., OpenMC, ANSYS, COMSOL) with examples of outputs or publications that demonstrate your proficiency.
Emphasize any work involving safety-critical systems, especially if you have experience with regulatory compliance or design for reliability in nuclear environments.
Tailor your cover letter to explain how your research or work experience directly addresses Marathon Fusion's mission of building the fuel cycle, not just generic fusion science.
Include a brief portfolio or summary of past projects where you designed, simulated, and validated a component or system, with quantifiable results.
✉️ What to Emphasize in Your Cover Letter
['Express passion for fusion energy and specifically for the fuel cycle challenges, showing you understand that blanket design is a critical bottleneck.', "Detail your experience with multiphysics simulation and how you've used it to solve real engineering problems, ideally in nuclear systems.", 'Describe your approach to developing test plans and validating models with experiments, as the job requires sequential test planning.', 'Mention familiarity with regulatory standards (NRC, ASME) and safety analysis methods, and how you would apply them to blanket design.']
Generate Cover Letter →🔍 Research Before Applying
To stand out, make sure you've researched:
- → Read Marathon Fusion's published papers or blog posts on their approach to tritium breeding and handling.
- → Understand the current state of blanket designs for tokamaks (e.g., ITER, DEMO) and stellarators to see where Marathon's work fits.
- → Look into the company's funding, partners, and timeline to gauge their stage and priorities.
- → Review the latest DOE fusion programs and initiatives related to tritium supply and fuel cycle to understand the broader context.
💬 Prepare for These Interview Topics
Based on this role, you may be asked about:
⚠️ Common Mistakes to Avoid
- Don't focus solely on plasma physics or confinement; this role is about the blanket and fuel cycle, so emphasize engineering and materials.
- Avoid being vague about your modeling skills—specify the exact codes and versions you've used and what you accomplished with them.
- Don't neglect safety and regulatory aspects; even if you haven't worked directly with NRC codes, show you understand their importance and have thought about how to comply.
📅 Application Timeline
This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.
Typical hiring timeline:
Application Review
1-2 weeks
Initial Screening
Phone call or written assessment
Interviews
1-2 rounds, usually virtual
Offer
Congratulations!
Ready to Apply?
Good luck with your application to Marathon Fusion!