Accelerator Physicist (BE-ABP-CEI-2026-136-GRAP)

You will contribute to a proposal covering the design, optimisation, and performance evaluation of a potential future collider at CERN. The role encompasses both beam optics development and beam dynamics simulations, including the study of key effects such as synchrotron radiation, beam-beam interactions, and impedance. Your responsibilities Contribute to the conceptual design phase of the study, supporting the development and assessment of the collider design. Propose optimisations of the linear and nonlinear beam optics of the collider, including tune scans and multi-objective optimisation of the dynamic aperture, as well as optimising collider parameters to maximise machine performance and operational robustness. Perform particle tracking studies for the collider across its operating energy range, including the effects of beam-beam interactions, synchrotron radiation, and beam impedance. Investigate key accelerator physics challenges for the collider, drawing on experience from the FCC-ee study. Your profile Knowledge of beam dynamics in synchrotrons and/or storage rings. Experience with some of the key beam dynamics effects relevant to lepton colliders, such as transverse coupling, beam-beam interactions, synchrotron radiation, or beam impedance. Experience in setting up, performing, and interpreting particle tracking simulations for accelerator physics studies. Skills Experience with accelerator physics simulation and analysis tools, such as MAD-X, ELEGANT, pyAT, Xsuite, or equivalent software. Experience in running and managing large-scale simulations on high-performance computing (HPC) systems. Strong communication and collaboration skills, with the ability to work effectively in an international, multidisciplinary environment. Ability to present technical and scientific results clearly, both orally and in writing. 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 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. Job closing date: 08.09.2026 at 23:59 CEST. Contract duration: 24 months, with a possible extension up to 36 months maximum. Working hours: 40 hours per week Job flexibility: Hybrid Target start date: 01-November-2026 Job reference: BE-ABP-CEI-2026-136-GRAP Field of work: Applied Physics Benchmark job: 200140 - Applied Physicist Global Benefits A monthly stipend between 6372-7004 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