At CERN, the European Organization 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.

Introduction:

You will play a key role in operating LINAC3, CERN’s ion linear accelerator, helping ensure reliable and efficient beam delivery across the injector chain. You will oversee the safe operation and performance of ion beams supplied to downstream machines, supporting daily operations, commissioning and machine development.

Working closely with operators, equipment experts and machine coordinators, you will contribute to optimising beam quality, availability and operational efficiency, while advancing automation and operational tools.

The Operations Group manages the full CERN accelerator complex and its technical infrastructure, including the LHC, delivering proton and heavy ion beams for a diverse experimental program. You will contribute directly to preparing beams for CERN’s physics research.

Functions:

• Contribute to and coordinate the daily operation of the LINAC3 ion accelerator, ensuring safe, reliable and timely beam delivery to downstream accelerators.
• Prepare, coordinate, and follow up the machine restart, beam commissioning, development and technical interventions.
• Coordinate closely with operators, engineers and equipment specialists to diagnose and resolve operational issues.
• Monitor beam quality and machine performance, analyse operational data and take corrective actions when needed.
  Use, maintain, and evolve standard operational tools, diagnostics and monitoring applications required for routine operation, troubleshooting and performance follow-up.
• Participate in and lead machine development activities aimed at improving performance, stability and availability.
• Develop and integrate advanced tools and algorithms for beam measurements, corrections, automation and performance optimisation, in close collaboration with machine and equipment experts.
• Produce and maintain operational and safety documentation for the accelerator, including new ion species.
• Contribute to shift coordination and operational planning, including participation in coordination rotas.
• Prepare and present clear status updates and reports for coordination meetings and management.
• Support knowledge transfer and on-the-job training of operators and junior colleagues.
• Contribute to cross-machine activities to ensure synergies and share best practices.

Master's Degree or PhD or equivalent relevant experience in the field of Applied Physics or Control & Automation Engineering or a related field.

Experience:

• Solid background in accelerator or beam physics, with a good understanding of charged particle beams and accelerator components.
• Hands-on experience with the operation, commissioning or performance optimisation of a complex scientific or industrial facility.
• Ability to analyse operational data, identify performance limitations and propose practical solutions.
• Experience working with and development of operational software, control system and data analysis tools (e.g. Python, Java and scientific programming languages).
• Practical knowledge of computer programs for beam simulations and accelerator modelling would be an asset.
• Proven ability to coordinate activities involving multiple technical teams and stakeholders.
• Strong problem-solving skills and ability to take responsibility in operational and time-critical situations.
• Good communication skills, with the ability to explain technical topics clearly to different audiences.
• Interest in contributing to continuous improvement of operational tools, procedures and safety practices.
• Experience in mentoring, training or knowledge transfer is considered an asset.

Technical competencies:

• Operation of accelerators.
• Analysis and optimisation of accelerator performance.
• Knowledge and application of accelerator physics theory.
• Design and implementation of safety interlock systems.
• Configuration and implementation of industrial data-acquisition, monitoring and control systems.
• Organisation, planning and control.

Behavioural competencies:

• Demonstrating Accountability: taking responsibility for own actions and decisions.
• Solving Problems: producing workable and timely solutions that meet requirements.
• Communicating Effectively: expressing opinions, ideas and suggestions with conviction and in a logical/structured manner; keeping to the point.
• Working in Teams: building and maintaining constructive and effective work relationships.
• Managing Self: remaining objective, focussed and productive in a stressful environment; focusing on solutions rather than problems.

Language skills:

Spoken and written English or French, with a commitment to learn the other language.

Eligibility and closing date:

Diversity has been an integral part of CERN's mission since its foundation and is an established value of the Organization. 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 15.06.2026 at 23:59 CEST.

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: Hybrid

This position involves:

• Participation in a regular stand-by duty, including nights, Sundays and official holidays.
• Work in Radiation Areas.
• Interventions in underground installations.
• A valid driving licence.

Job grade: 6-7

Job reference: BE-OP-PSB-2026-106-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