Radiation Physicist for FCC-ee

Job Description In this role, you will perform Monte Carlo radiation transport studies for the FCC-ee technical insertions, quantifying the radiation exposure of equipment installed in the FCC-ee tunnel. In addition, you will perform energy deposition studies for the design of different FCC-ee accelerator systems, in particular the collider and booster dump systems and protection devices. Your responsibilities: - Carry out particle-matter interaction studies with the FLUKA Monte Carlo code and implement geometry models for FCC-ee machine studies. - Assess the expected radiation levels due to regular beam losses and synchrotron radiation emission in the FCC-ee technical insertions. - Perform energy deposition studies for accidental beam losses in FCC-ee and actively participate in the conceptual design of FCC-ee protection devices (absorbers, collimators) and dumps. - Closely collaborate with beam physicists and mechanical engineers, in order to translate absorber and dump concepts into technical specifications. Your profile: - Knowledge of particle-matter interactions. - Experience with Monte Carlo radiation transport simulations nd transport codes (FLUKA, Geant4, etc.). - Proficiency in scientific computing. - Knowledge of accelerator physics is an advantage. - The ability to collaborate in a multidisciplinary and international team environment. Skills: - Basic programming skills (e.g. Python, C++) for data analysis and code development. - Familiarity with numerical methods and scientific computing. - Problem-solving mindset and ability to learn new tools quickly (e.g. auxiliary tools for particle transport simulations). - Excellent team-working attitude, with colleagues from different fields of applied physics and engineering (multidisciplinary and international environment). - Spoken and written English, with a commitment to learn French. Eligibility criteria: - You are a national of a CERN Member or Associate Member State. - You have a professional background in Applied Physics (or a related field) and have either: - a Master's degree with 2 to 6 years of post-graduation professional experience; - or a PhD with no more than 3 years of post-graduation professional experience. - You have never had a CERN fellow or graduate contract before. Additional Information Job closing date: 11.01.2026 at 23:59 CET. Contract duration: 24 months, with a possible extension up to 36 months maximum. Working hours: 40 hours per week Job flexibility: Fully Onsite Target start date: 01-March-2026 Job reference: SY-STI-BMI-2025-253-GRAP Field of work: Applied Physics Benchmark job: 200140 - Applied Physicist Global Benefits - A monthly stipend between 6287-6911 Swiss Francs per month (tax free) depending on your degree. - 30 days of paid leave per year plus 2 weeks annual closure. - Coverage by CERN’s comprehensive health insurance scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund. - Family, child and infant monthly allowances depending on your individual circumstances. - A relocation package (installation grant and travel expenses) depending on your individual circumstances. - Possibility to extend your contract up to 36 months. - On-the-job and formal training including language classes. Overview of CERN - Discover a world where the impossible is made possible At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive. Every day, we face exciting new challenges and opportunities to contribute to cutting-edge research that shapes our understanding of the universe. We meet these challenges through the diverse perspectives within our teams, ensuring every contribution is valued and driving our shared sense of inclusion and purpose. Diversity is a core value of CERN since its foundation, and it remains central to our mission and continued success. If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe TAKE PART More information about us, here: careers.cern