Radiation Physicist for FCC-ee (SY-STI-BMI-2025-253-GRAP)

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.
• Proficiency in scientific computing.
• Knowledge of accelerator physics is an advantage.
• The ability to collaborate in a multidisciplinary and international team environment.

Skills:

• Knowledge of Monte Carlo radiation transport codes (FLUKA, Geant4, etc.).
• 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.
• 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.

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.

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