CERN Position: Accelerator Physicist (SY-ABT-BTP-2025-262-LD)

Location: Geneva, ch

Company Description:

At CERN, the European Organisation for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. Using the world”s largest and most complex scientific instruments, they study the basic constituents of matter – fundamental particles that are made to collide together at close to the speed of light. The process gives physicists clues about how particles interact, and provides insights into the fundamental laws of nature.

Job Description:

Introduction

You will engage in the design and specification of beam transfer systems across CERN’s accelerator complex, following the systems from initial concept to beam commissioning and operational deployment. An intrinsic part of your work will be to carry out the R&D needed to understand the performance of existing beam transfer systems and to propose improvements or upgrades needed to meet the future needs of CERN’s ambitious research programme.

Functions

• Design and specify beam transfer systems (injection, extraction, primary beamlines/transfer lines) in collaboration with internal and external partners, including drafting technical and functional requirements.
• Develop and perform beam dynamics simulations including advanced ML/AI-based models to analyse, predict, and optimise system behaviour and performance.
• Conduct R&D to improve system performance and reliability, including planning and coordinating machine development studies to validate new concepts.
• Commission beam transfer systems with particle beams, diagnose operational issues, and propose solutions to maintain or enhance performance.
• Communicate results through peer-reviewed publications, conference contributions, and clear presentations tailored to both technical and non-technical audiences.
• Supervise students and coordinate postdoctoral research contributions to beam transfer studies and R&D activities.

Qualifications:

Master”s degree or PhD or equivalent relevant experience in the field of Physics, Applied Physics or a related field.

Experience:

• Experience in accelerator physics, including beam dynamics and modelling with simulation tools.
• Practical experience at accelerator facilities with machine development studies, beam commissioning and operational support.
• Ability to analyse complex technical problems, evaluate system performance, and develop data-driven solutions.
• Demonstrated expertise in developing robust software for simulation, data analysis, and/or automation with the application of Machine Learning, AI, and/or advanced optimisation techniques.

Technical competencies:

• Knowledge and application of accelerator physics theory;
• Knowledge and application of beam injection and extraction methods, beam transfer and dumping;
• Simulation, design and development of primary and secondary beam lines;
• Analysis and optimisation of accelerator performance, including application of machine learning and AI concepts;
• Knowledge of/ identification and selection of relevant emerging accelerator technologies.

Behavioural competencies:

• Demonstrating Accountability: taking responsibility for own actions and decisions.
• Managing Self: remaining objective, focused and productive in a stressful environment; focusing on solutions rather than problems.
• Demonstrating Flexibility: being willing to work on different projects simultaneously.
• Learning and Sharing Knowledge: sharing knowledge and expertise freely and willingly with others; coaching others to ensure knowledge transfer.
• Communicating Effectively: delivering presentations in a structured and clear way; adjusting style and content to the audience; responding calmly and confidently to questions.

Language skills:

Spoken and written English, with a commitment to learn French.

Additional Information:

Eligibility and closing date:

Diversity has been an integral part of CERN”s mission since its foundation and is an established value of the Organisation. Employing a diverse workforce is central to our success. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 18.01.2026 at 23:59 CET.

Employment Conditions

Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

Working Hours: 40 hours per week

Job Flexibility: Fully Onsite

This position involves:

• A valid driving licence.
• Work during nights, Sundays and official holidays, when required by the needs of the Organisation.
• Exposure to electromagnetic fields under certain exposure conditions.
• Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed.

Job grade: 6-7

Job reference: SY-ABT-BTP-2025-262-LD

Field of work: Applied Physics

Benchmark Job Title: Applied Physicist

Global Benefits

• A competitive salary (tax free), increasing in line with your years of relevant experience.
• 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, removal, travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 8 years + eligibility for indefinite contract tenure.

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

Level of Education: Master Degree

Work Hours: 8

Experience in Months: 24