Accelerator Physicist

19 Jul 2017
End of advertisement period
30 Aug 2017
Academic Discipline
Physical Sciences, Physics & Astronomy
Contract Type
Fixed Term
Full Time


Accelerator Physicist in the Beams Department (BE), Accelerator and Beam Physics Group (ABP), Hadron Synchrotrons Coherent effects (HSC) Section.

You will join:

  • The Beams (BE) Department is at the heart of the CERN accelerator complex and hosts the groups responsible for the beam generation, acceleration, diagnostics, controls and performance optimization.
  • The Accelerators and Beam Physics (ABP) Group is responsible for beam performance from the source to the Large Hadron Collider (LHC) and carries out Research & Development (R&D) activities on the upgrade of the LHC, its injectors, and future colliders (CLIC and FCC).
  • The Hadron Synchrotron Coherent effects (HSC) Section is responsible for studying coherent effects and their mitigation by developing theoretical models, simulation codes and by conducting experimental research. Coherent transverse instabilities induced by beam coupling impedance and space charge, beam-beam, electron cloud effects and their interplay can limit the beam intensity and brightness and therefore the performance of the present and future CERN accelerators. An accurate theoretical description, precise models, realistic simulations and thorough benchmarking with dedicated experiments are required in order to assess the present and future performance limitations and devise cures, mitigation measures and the corresponding operational scenarios. (


As Accelerator Physicist in the HSC Section of the ABP Group, you will contribute to the study of the collective effects and in particular of the mechanisms responsible for transverse coherent beam instabilities in particle accelerators. You will also devise mitigation techniques to push further the performance of the existing and future CERN accelerators.

Specific tasks will include:

  • Conception or improvement of analytical or semi-analytical models of transverse coherent beam instabilities in high intensity and high brightness beams including the combined effects of:
  • Beam coupling Impedance.
  • Space charge.
  • Electron cloud.
  • Beam-beam.
  • Lattice optical properties (tune, coupling, chromaticity and other nonlinear properties).
  • Longitudinal motion.
  • Transverse feedbacks.
  • Development of accurate simulation codes or the improvement of existing ones.
  • Validation of the models and simulations in the different CERN accelerators by conceiving, conducting machine experiments and analysing the corresponding beam data.
  • Conception of cures and/or mitigation techniques.


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

Experience and competencies

The experience required for this post is:

  • Experience in the theoretical computation of collective coherent effects in charged particle beams (e.g. theoretical instability studies with simplified analytical models and/or solving the Vlasov equation).
  • Experience with multi-particle simulation codes.
  • Experience of experimental techniques and analysis of data from beam measurements.
  • Experience in the performance optimization of synchrotrons would be an asset.

The technical competencies required for this post are:

  • Knowledge of accelerator physics theory.
  • Knowledge of collective effects (beam-beam, space charge, cooling).
  • Accelerator performance analysis & optimization.

The behavioural competencies required for this post are:

  • Achieving results: driving work / projects along and seeing them through to their conclusion.
  • Communicating effectively: listening actively to others and letting others speak; expressing opinions, ideas and suggestions with conviction and in a logical/structured manner; keeping to the point.
  • Demonstrating accountability: taking responsibility for own actions and decisions.
  • Working in teams: gaining trust and collaboration from others; building and maintaining constructive and effective work relationships.

The language competencies required are:

  • Spoken and written English or French: ability to understand and speak the other language in professional contexts. Ability to draw-up technical specifications and/or scientific reports and to make oral presentations in at least one of the two languages.

Eligibility and closing date

Employing a diverse and international workforce is a CERN core value and central to our success. We welcome applications from all Member States irrespective of gender, age, disability, sexual orientation, race, religion or personal situation.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 30.08.2017.

By applying here, you allow CERN to consider your application for any position it considers relevant with respect to your profile. Please ensure you update your profile regularly with any relevant information and that you inform the recruitment service if you wish your file to be removed from the database.

Note on Employment Conditions

We offer a limited-duration contract for a period of 5 years. Limited-duration contracts shall terminate by default on their date of expiry.
Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

These functions require:

  • Work during nights, Sundays and public holidays.
  • Work in radiation areas.
  • Interventions in underground installations.
  • Stand-by duty, when required by the needs of the Organization.