Plasma Spectroscopy Diagnostician

Proxima Fusion

WHO WE ARE Proxima Fusion is Europe’s fastest-growing fusion company and the continent’s best-funded fusion player, as well as the first spin-out from the Max Planck Institute for Plasma Physics (IPP). Backed by over €650M and powered by a growing team across Munich, Zurich, and Oxford, we are developing the hardware and infrastructure needed to deliver the world’s first commercial stellarator fusion power plant. Our concept advances the most mature fusion technology out there, the Wendelstein 7-X stellarator, through two next-generation machines: Alpha and Stellaris. Our work combines stellarator optimization, advanced computation, machine learning, and high-temperature superconducting magnets to unlock higher-performance designs that were previously out of reach. Turning these designs into a functioning fusion power plant requires excellence and ownership across every discipline, from physics and engineering to software, manufacturing, law, and business functions. TEAM AND ROLE * Shape the architecture of the world’s first commercial fusion power plant – Own system-level decisions that determine how a first-of-a-kind energy technology is designed, integrated, and ultimately deployed at scale. * Solve some of the most complex engineering challenges in industry – Work across tightly coupled disciplines (plasma physics, magnets, cryogenics, manufacturing, controls, and more) to resolve critical trade-offs and turn cutting-edge science into a functioning product. * Build real hardware with a pragmatic, fast-moving team from all over the world – Combine advanced simulation and systems thinking with a strong execution mindset, focusing on practical engineering solutions that accelerate the path to commercial fusion energy. YOUR IMPACT We are seeking a highly skilled and motivated Plasma Physicist to join our stellarator design team at Proxima Fusion. We are designing a net-energy stellarator as a research and engineering platform on the path toward a fusion power plant. This role is crucial to driving our mission to design, build, and operate the device. As a Plasma Physicist, you will lead the conceptualization and development of key scientific analysis workflows and contribute to novel research in magnetic confinement fusion. Proxima Fusion is committed to publishing its scientific results to accelerate the entire fusion ecosystem, openly collaborating with academic partners, and contributing to public trust in fusion energy. WHY JOIN PROXIMA FUSION * You will get to work on some of the most complex tech challenges to bring abundant, safe, clean energy to the world. * You'll get to join and learn from an exceptional selection of accomplished and driven individuals. * Do your life’s best work and enjoy the journey. * Get to show that big things are possible in Europe when you assemble the best talent. WHAT YOU WILL DO * Contribute to the definition of requirements and conceptualize the design of critical stellarator components such as heating systems and divertors. * Develop and enhance our physics and engineering simulation stack. * Collaborate with partners from public institutions to foster innovation and knowledge exchange. * Mentor team members and guide them in achieving project milestones. WHO YOU ARE * We are looking for high performers who love challenges and see these as learning opportunities. * It is important not to be afraid to experiment, take risks and learn from mistakes. We believe in continuous iterations and getting things done. * Hold a PhD in Plasma Physics, Nuclear Engineering, or a related field, with a focus on magnetic confinement fusion—preferably on a toroidal confinement device. * Have demonstrated expertise in one or more of the following areas: core transport, plasma heating, MHD, edge physics, or scenario development. * Possess strong problem-solving skills and the ability to make informed decisions in a fast-paced environment. * Have excellent communication skills, with the ability to collaborate effectively within a multidisciplinary team. INTERVIEW PROCESS * Recruiter Interview (30-60 min) * Technical Screening (30 min) * Technical Panel (3x60 min) *This role sits at L3 of our framework, please inquire during the recruitment process for further information. At Proxima Fusion, our mission is bold: making limitless clean energy a reality. To get there, we need a high-performing, diverse team that brings different perspectives, challenges assumptions, and builds together with purpose. We know that diversity of thought and experience leads to better ideas, stronger execution, and a more resilient team. We don’t look at how you identify, what you look like, who you choose to worship or what ethnicity you are. We care about what you can bring to the table.

Proxima Fusion

WHO WE ARE Proxima Fusion is Europe’s fastest-growing fusion company and the continent’s best-funded fusion player, as well as the first spin-out from the Max Planck Institute for Plasma Physics (IPP). Backed by over €650M and powered by a growing team across Munich, Zurich, and Oxford, we are developing the hardware and infrastructure needed to deliver the world’s first commercial stellarator fusion power plant. Our concept advances the most mature fusion technology out there, the Wendelstein 7-X stellarator, through two next-generation machines: Alpha and Stellaris. Our work combines stellarator optimization, advanced computation, machine learning, and high-temperature superconducting magnets to unlock higher-performance designs that were previously out of reach. Turning these designs into a functioning fusion power plant requires excellence and ownership across every discipline, from physics and engineering to software, manufacturing, law, and business functions. TEAM AND ROLE * Shape the architecture of the world’s first commercial fusion power plant – Own system-level decisions that determine how a first-of-a-kind energy technology is designed, integrated, and ultimately deployed at scale. * Solve some of the most complex engineering challenges in industry – Work across tightly coupled disciplines (plasma physics, magnets, cryogenics, manufacturing, controls, and more) to resolve critical trade-offs and turn cutting-edge science into a functioning product. * Build real hardware with a pragmatic, fast-moving team from all over the world – Combine advanced simulation and systems thinking with a strong execution mindset, focusing on practical engineering solutions that accelerate the path to commercial fusion energy. WHY JOIN PROXIMA FUSION * Work on some of the most critical physics challenges that govern the conceptual viability and optimal performance of steady state fusion reactors. * Advance the next generation of edge transport physics models (including turbulent transport characterisation, drift effects, and impurity migration) required for reactor-relevant stellarator exhaust solutions. * Apply state-of-the-art numerical models directly to hardware design decisions with reactor-scale impact. * Contribute to the European initiative leading the critical path to a fusion power plant. * Work alongside talented, mission-driven experts in a supportive, ambitious environment that is building real devices, not just reactor concepts. YOUR IMPACT You will tackle one of the defining challenges of stellarator reactors: controlling the plasma edge and exhaust in a complex 3D magnetic topology. By advancing the physics and design of the divertor, baffling, and first wall geometry, you will enable robust heat and particle exhaust - safely managing helium ash, impurities, and extreme power loads under reactor-relevant conditions. You will develop and apply state-of-the-art (and beyond) theoretical and computational models of the edge and Scrape-Off Layer, addressing non-linear multi-physics dynamics across plasma transport, equilibrium ExB flows, neutral interactions, molecular recombination, and impurity behaviour. Grounded in experimental validation and integrated with engineering constraints, your work will directly inform the design of next-generation plasma exhaust systems for commercial fusion. This is an opportunity to turn frontier edge physics into reactor-ready solutions and help close the gap between today’s modelling capability and the needs of fusion power. WHAT YOU WILL DO * As an edge transport physicist at Proxima, you will play a central role in efforts to model and design the edge and Scrape-Off Layer of real-world machines that are necessary steps on the path towards commercial fusion power. * You will develop and apply theoretical and computational models that surpass the state of the art, closing key gaps in turbulent transport, equilibrium ExB flows, molecular recombination, and impurity behaviour in the stellarator edge. * Your results and design strategy will be grounded by experimental insights, before being integrated into the design of next generation plasma exhaust systems. * Your work will involve close engagement with engineers to ensure compatibility with overall device design and reactor-relevant operating scenarios. WHO YOU ARE * Hold a postgraduate degree in plasma physics. * Strong experience in edge transport and a clear interest in translating physics understanding into a practical plasma exhaust strategy. * Bring experience using simulation and modeling to inform the geometry and operational limits of high-heat-flux systems. * Are comfortable working across disciplines, collaborating directly with engineers to frame open-ended design challenges, proposing solutions, testing ideas, and iterating quickly. * Proficient in scientific programming languages (Python, Julia, C++, and/or Fortran). * Take initiative, communicate clearly, and are motivated by building systems that will define the future of fusion energy. INTERVIEW PROCESS * Recruiter Interview (30-60 min) * Technical Screening (30 min) * Technical Panel (3x60 min) *This role sits at L3 of our framework, please inquire during the recruitment process for further information. At Proxima Fusion, our mission is bold: making limitless clean energy a reality. To get there, we need a high-performing, diverse team that brings different perspectives, challenges assumptions, and builds together with purpose. We know that diversity of thought and experience leads to better ideas, stronger execution, and a more resilient team. We don’t look at how you identify, what you look like, who you choose to worship or what ethnicity you are. We care about what you can bring to the table.

Proxima Fusion

WHO WE ARE Proxima Fusion is Europe’s fastest-growing fusion company and the continent’s best-funded fusion player, as well as the first spin-out from the Max Planck Institute for Plasma Physics (IPP). Backed by over €650M and powered by a growing team across Munich, Zurich, and Oxford, we are developing the hardware and infrastructure needed to deliver the world’s first commercial stellarator fusion power plant. Our concept advances the most mature fusion technology out there, the Wendelstein 7-X stellarator, through two next-generation machines: Alpha and Stellaris. Our work combines stellarator optimization, advanced computation, machine learning, and high-temperature superconducting magnets to unlock higher-performance designs that were previously out of reach. Turning these designs into a functioning fusion power plant requires excellence and ownership across every discipline, from physics and engineering to software, manufacturing, law, and business functions. TEAM AND ROLE * Shape the architecture of the world’s first commercial fusion power plant – Own system-level decisions that determine how a first-of-a-kind energy technology is designed, integrated, and ultimately deployed at scale. * Solve some of the most complex engineering challenges in industry – Work across tightly coupled disciplines (plasma physics, magnets, cryogenics, manufacturing, controls, and more) to resolve critical trade-offs and turn cutting-edge science into a functioning product. * Build real hardware with a pragmatic, fast-moving team from all over the world – Combine advanced simulation and systems thinking with a strong execution mindset, focusing on practical engineering solutions that accelerate the path to commercial fusion energy. WHY JOIN PROXIMA FUSION Working with us, you have the chance to: * Translate state-of-the-art numerical tools directly into hardware design decisions with reactor-scale consequences. * Contribute to the European initiative leading the critical path to a fusion power plant. * Work alongside talented, mission-driven experts in a supportive, ambitious environment that is building real devices, not just reactor concepts YOUR IMPACT In a fusion reactor, the plasma-facing components - divertor targets, first wall panels, and baffles - are the first line of defense against extreme heat and particle loads, requiring them to endure complex plasma-surface interactions. Developing materials and component solutions that withstand these conditions is one of the most significant challenges in fusion science and engineering, determining device lifetime, maintainability, and overall viability. As a Plasma-Facing Materials engineer at Proxima, you will lead efforts to model, understand, and validate the performance of PFC materials and assemblies under reactor-relevant conditions. Your work will directly inform the operational window of Proxima’s future stellarators. The work will span both detailed plasma-material interaction simulation, building towards full physics assessments of Tungsten migration, as well as targeted experimental validation of material architectures to ensure that PFC designs meet demanding reliability and engineering criteria. This role offers a rare opportunity to directly influence the design and qualification of components at the heart of a commercial stellarator. Your work will determine how long Proxima’s core components last, how clean our plasma remains, and how economically our power plant can operate. WHAT YOU WILL DO * Own the solution to critical plasma-material engineering challenges that govern the lifetime and optimal performance of steady state fusion reactors. * Define and advance the impurity migration and plasma material interaction modeling framework used for specifying reactor-relevant stellarator exhaust solutions. * Work closely with engineers to ensure that net erosion and core impurity contamination from plasma facing components, particularly the divertor and first wall, are compatible with intended reactor relevant operational scenarios. * Lead development, validation and application of advanced edge physics models for plasma material interaction studies in order to guide the divertor subsystem and first wall design. * Quantify plasma-surface interaction constraints to ensure plasma-facing components remain within engineering limits. * Collaborate with academic partners to develop and apply workflows that characterise divertor and edge impurity migration. * Identify, initiate, and lead R&D projects, working closely with industry and scientific partners. WHO YOU ARE * Hold a postgraduate degree in plasma physics. * Have strong experience in impurity transport and a clear interest in translating physics understanding into a practical plasma exhaust strategy. * Bring experience using simulation and modeling to inform the geometry and operational limits of high-heat-flux systems. * Be comfortable working across disciplines, collaborating directly with engineers to frame open-ended design challenges, proposing solutions, testing ideas, and iterating quickly. * Bring expertise in simulation modeling and the design of high-heat-flux systems or plasma-facing components. * Be proficient in scientific programming languages (Python, Julia, C++, and/or Fortran). * Take initiative, communicate clearly, and be motivated by building systems that will define the future of fusion energy. INTERVIEW PROCESS * Recruiter Interview (30-60 min) * Technical Screening (30 min) * Technical Panel (3x60 min) *This role sits at L2 of our framework, please inquire during the recruitment process for further information. At Proxima Fusion, our mission is bold: making limitless clean energy a reality. To get there, we need a high-performing, diverse team that brings different perspectives, challenges assumptions, and builds together with purpose. We know that diversity of thought and experience leads to better ideas, stronger execution, and a more resilient team. We don’t look at how you identify, what you look like, who you choose to worship or what ethnicity you are. We care about what you can bring to the table.