Applied Physicist for Beam-beam and DA Optimisation
Applied Physicist for Beam-beam and DA Optimisation
CERN - European Organization for Nuclear Research
Geneva, Switzerland
Your responsibilities
In this position you will work within the Accelerators and Beam Physics Group (ABP) in the Beams Department (BE), specifically within the Incoherent Effects Section (INC), which is responsible for theoretical, numerical and experimental studies and proposals for the mitigation of interleaved incoherent multi-particle effects (e.g. space charge, beam-beam, intra-beam scattering, e-cloud, cooling) affecting the performance of present and future circular accelerators.
This position is focused on optimising the dynamic aperture (DA) and beam-beam collisions of the HL-LHC. This is to be achieved through studying and improving magnet field quality (FQ) and sorting activities.
The selected candidate will work on the following topics:
- Study of sorting scenarios for the new HL LHC magnets with particular emphasis on prioritization of the sorting criteria (transfer function errors and field quality);
- Follow up of the quality of magnets (transfer function and field quality) in view of defining their slot allocation and assess of their impact on the machine dynamic aperture;
- Use the outcome from the sorting scenarios and slot allocation to study HL LHC operational scenarios in terms of dynamic aperture. The studies should naturally focus to the flattop luminosity production hence including beam-beam effects (e.g. luminosity levelling strategy, filling schemes and crab cavities configuration) together with the overall machine settings (tunes, chromaticity and octupoles);
- Analyse the impact of the aforementioned parameters (e.g., measured field quality, sorting scenarios, beam-beam effect, octupoles...) on the beam halo formation.
Your profile
Skills:
- Knowledge in optics design;
- Numerical tools (python);
- Non-linear beam dynamics and incoherent effects for synchrotron rings and colliders;
- Fluent in English, the ability to work in French would be an advantage.
Eligibility criteria:
- You are a national of a CERN Member or Associate Member State;
- You have a professional background in Applied physicist (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.
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