ATLAS Detector Cooling Engineer (EP-ATL-PO-2026-240-GRAE)

As part of the ATLAS Detector Cooling team, you will contribute to the qualification, integration, and commissioning of the 2PACL CO₂ cooling system supporting future detector upgrades. You will be involved in thermal testing, instrumentation and DAQ development, data analysis, and the installation and commissioning of cooling infrastructure, gaining unique experience in the deployment of complex systems for a world-leading scientific experiment. Your responsibilities Contribute to the testing and validation of detector structures and 2PACL CO₂ cooling system components, including comparison of experimental results with simulation models. Participate in the design, construction, and operation of thermal test setups, instrumentation, and data acquisition (DAQ) systems. Analyse and interpret test data to assess system performance and support detector integration activities. Collaborate with detector teams by providing technical feedback and supporting detector integration and commissioning work. Contribute to the installation, commissioning, and performance validation of the 2PACL cooling system, including cooling distribution lines and vacuum infrastructure. Your profile Initial experience in thermal-fluid systems, cooling technologies, or heat transfer gained through academic, research, or engineering projects. Experience with simulation or modelling of thermal and fluid systems. Experience using CAD software for 2D and/or 3D mechanical design (e.g. CATIA V5 or similar tools). Hands-on experience with instrumentation, laboratory testing, or data acquisition (DAQ) systems. Experience analysing and interpreting experimental or simulation data. Skills Good understanding of thermodynamics and heat transfer principles, ideally including exposure to two-phase cooling systems. Knowledge of fluid mechanics and thermal-fluid system behaviour. Ability to read and interpret electrical schematics and technical drawings. Familiarity with instrumentation, sensor integration, and data acquisition (DAQ) systems. Understanding of SCADA systems and industrial control environments. Spoken and written English, with a commitment to learn French. Eligibility criteria: You are a national of a CERN Member or Associate Member State . By the application deadline, you have a maximum of two years of professional experience since graduation in Mechanical Engineering, Electrical Engineering, Electromechanical Engineering, Refrigeration (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree . You have never had a CERN fellow or graduate contract before. Applicants without University degree are not eligible. Applicants with a PhD are not eligible. Job closing date: 28.10.2026 at 23:59 CET. Open positions: 2 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-January-2027 This position involves: Participation in a regular stand-by duty, including nights, Sundays and official holidays (for the Mechanical Engineering position). Work during nights, Sundays and official holidays (for the Mechanical Engineering position). Work in Radiation Areas. Interventions in underground installations. A valid driving licence. Job reference: EP-ATL-PO-2026-240-GRAE Field of work: Mechanical Engineering & Electrical Engineering Benchmark job: 200090 - Mechanical Engineer; 200040 - Electromechanical Engineer Global Benefits A monthly net stipend of either 5266 or 5793 Swiss Francs per month 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: