Accelerator Physicist for Beam Collimation

What you'll do

You will join the Accelerators and Beam Physics (ABP) Group, responsible for beam performance across the entire accelerator chain—from the LHC and its injectors to future accelerator projects. Within the Non-linear Beam Dynamics and Collimation (NDC) Section, you will contribute to theoretical, numerical and experimental studies on beam dynamics and collimation, addressing beam loss management, performance optimisation and mitigation strategies through predictive modelling for proton, ion and lepton beams. Your work will support the safe and efficient operation of high-intensity accelerators and the optimisation of background conditions for current and future colliders. This role is key to CERN’s long-term vision, supporting both the High-Luminosity LHC and design studies for the Future Circular Collider (FCC).

Your responsibilities

You will participate in the activities related to beam collimation studies and machine-detector interface (MDI) for the CERN accelerators, their upgrades, and future accelerators, through simulations, measurements, and theoretical calculations.
You will contribute to the operational performance of the LHC and HL-LHC and join the R&D efforts within the FCC study.
You will join the ongoing efforts for accelerator codes development for these studies.
Specifically, you will develop optics, non-linear beam dynamics and beam collimation concepts in view of evaluating halo generation and loss mechanisms, and perform studies of collimation performance, in particular for optimization of collimation designs and MDI layouts, for CERN present and future synchrotrons and colliders, addressing proton as well as ion operation.
Specifically, you will Study and optimize operational conditions for the HL-LHC collimation system and optimize background induced by beam loss mechanisms, to improve the performance aided by beam measurements and simulations.
Specifically, you will join the LHC beam commissioning during 2026 and contribute to activities under NDC section responsibility.
Specifically, you will participate with a key role in the preparation and execution of the startup of these systems in the HL-LHC era starting in 2030.
Specifically, you will design and conduct experiments in the existing CERN synchrotrons, and possibly in other operating accelerators to validate the concepts and codes developed.

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Your profile

Working in a scientific environment, preferably in the design and/or operation of particle accelerators.
Accelerator physics, with the competence in the field of beam collimation.
Experimental techniques and analysis of data from beam measurements.
Development of single-particle beam dynamics simulation codes.
Knowledge with one or more of the following codes, in particular for collimation simulations: MAD-X (see here http://madx.web.cern.ch/madx/), Xsuite (see https://xsuite.readthedocs.io/en/latest/index.html), SixTrack (see here http://sixtrack-ng.web.cern.ch/sixtrack-ng/) is an asset.
Beam commissioning and performance optimization of existing accelerator facilities is an asset.
Beam Collimation, beam loss mechanisms and experimental background studies is an asset.
PhD or equivalent relevant experience in the field of Physics or Engineering or a related field.

Your skills

Knowledge and application of single-particle dynamics (longitudinal/transverse):
Knowledge and application of beam collimation techniques:
Analysis and optimization of accelerator performance:
Simulation, design and development of (part of) particle accelerators:
Knowledge and application of non-linear beam dynamics
Having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind; assimilating large quantities of information, identifying key issues and formulating conclusions clearly and concisely.
Working well in groups and readily fitting into a team; participating fully and taking an active role in team activities; expressing opinions, ideas and suggestions with conviction and in a logical/structured manner; keeping to the point.
Taking responsibility for own actions and decisions.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/12/2025

Contract duration: 60

Grade range: 6

Benchmark job: 200140 - Applied Physicist

Job flexibility: Fully Onsite

Global Benefits at CERN

A minimum entry-salary of 9113 Swiss Francs per month (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.

Let's get you ready

Be sure to meet the eligibility criteria

You are a national of a CERN Member State or Associate Member State.
You have relevant qualifications and professional experience.
If you have previously held a Staff contract at CERN, you will not be eligible for these positions.
Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

Your CV (English or French)
Any document you consider relevant to your application

Your CERNDepartment

The BE department is at the heart of CERN's accelerator complex.

It is responsible for the design, construction, and operation of accelerators and technical infrastructure that provide the cutting-edge scientific instruments needed by the physics community.

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!

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Still have a doubt ? Here are the most frequently asked questions

What should I expect during my first week at CERN?

Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
How big would the team be?

The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
What is the working language at CERN?

The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
What support does CERN provide for relocation?

CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
Do I need a visa to work at CERN?

Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
What would my salary be?

Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.