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Applied Physicist expert in beam-matter interaction simulation (EN-STI-BMI-2020-113-LD)

Geneva (Switzerland)

  • Organization: CERN - European Organization for Nuclear Research
  • Location: Geneva (Switzerland)
  • Grade: Grade 6 - Professional roles - Only open to Nationals of all CERN Member States and Associate Member States - Mid/Senior level
  • Occupational Groups:
    • Nuclear Technology
    • Malaria, Tuberculosis and other infectious diseases
    • Physics and Mathematics
    • Mechanics and Electronics (Engineering)
  • Closing Date: 2020-10-31

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Company Description

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. Find out more on

Job Description


The Engineering Department EN) pushes forward the limits of technology to provide innovative research tools to the physics and engineering worldwide community. Within Sources, Targets and Interactions Group (STI) of the EN department, you will join the Beam Machine Interactions (BMI) Section, which is responsible for the development and maintenance of the FLUKA Monte Carlo code and for providing formal training and support to its users. including in particular in the accelerator community and to the experiments worldwide. The section also performs beam-machine interaction studies for all CERN accelerators, and FLUKA calculations for different applications, including conceptual design of beam intercepting devices, new target areas, medical applications, etc.

Are you excited to join the world leading particle physics research laboratory? Then join CERN and take part! 


As Physicist/Engineer in the Beam Machine Interactions Section, you will initially: 

  • Define and supervise particle shower calculations and devise beam loss data analyses to assist the LHC operation;
  • Perform simulation studies for the design of future machines and facilities, in the context of the Updated European Strategy implementation, with particular attention to: FCC (FCC-ee and FCC-hh), Physics Beyond Collider (PBC), Muon Collider and international collaboration initiatives (ILC, FAIR, J-PARC);
  • Provide the required support to the accelerator facilities, including the LHC injectors, and the ones under the group responsibility: n_TOF (in particular the NEAR irradiation station) and ISOLDE (including the ISIS irradiation station). 


Master's degree or equivalent relevant experience in the field of physics or nuclear engineering, or a related field.


  • Proven experience within beam-matter interaction and its effects; 
  • Proven experience within particle and nuclear physics; 
  • Extensive experience in Monte Carlo simulation of particle showers in complex geometries and in calculation and benchmarking of machine protection relevant quantities; 
  • Characterization of the radiation environment in accelerators. 

Would be considered a plus: 

  • Experience in computer programming and tool development, knowledge of any of Fortran, C, C++ and Python. 

Technical competencies:

  • Simulation, design and development of (part of) particle accelerators;
  • Simulation, design and development of infrastructure for detectors or experimental facilities;
  • Knowledge and application of electromagnetic radiation propagation and interaction with matter;
  • Knowledge and application of motions and interactions of neutrons with materials (neutronics).

Behavioural competencies:

  • Working in teams: building and maintaining constructive and effective work relationships Contributing to promoting a positive atmosphere in the team through an optimistic and constructive attitude; addressing issues; sharing and letting others participate in own work/project; encouraging team development.
  • Demonstrating flexibility: actively participating in the implementation of new processes and technologies; demonstrating willingness to alter views when presented with new information being able to deal with ambiguous or unpredictable situations.
  • Achieving results: defining clear objectives, milestones and deliverables before initiating work/ project; objectively assessing and monitoring own work; regularly reporting on progress and advising of any changes in schedule or priorities.
  • Solving problems: assimilating large quantities of information, identifying key issues and formulating conclusions clearly and concisely; being open to original ideas and creative options by which to address issues; continually driving change by seeking new ways to improve outcomes.
  • Learning and sharing knowledge: creating or participating in forums to exchange experience, comparing techniques and learn from others; proposing ways to improve or streamline existing procedures, processes and methodologies; thinking "out of the box" and proposing fresh ideas, insights and methodologies.

Language skills:

Spoken and written English or French: ability to draw-up technical specifications and/or scientific reports and to make oral presentations in at least one of the two languages and an undertaking to acquire the other rapidly.

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 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 31/10/2020.

Employment Conditions

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

These functions require:

  • Work in Radiation Areas.
  • Interventions in underground installations.
  • A valid driving licence is required.
  • Shift work, when required by the needs of the Organization.

Job grade: 6-7

Job reference: EN-STI-BMI-2020-113-LD

Benchmark Job Title: Applied Physicist

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