Beam Physicist

What you'll do

You will work on electromagnetic simulations for wake field and beam coupling impedance studies in accelerator components as well as their coupling with beam dynamics.

A key objective of the project is the further development of Wakis, an open-source wakefield simulation code available on GitHub, including the implementation of new features, benchmarking against commercial EM solvers, and validation on realistic accelerator geometries using bench measurements of different types. An optimised interface of Wakis with the beam dynamics code Xsuite will be also developed.

This project will naturally require you to also contribute to the supervision and technical support of students, gaining experience in mentoring within an international research environment.

The work will therefore combine computational and applied electromagnetics, accelerator physics, and scientific software development within a team.

Your responsibilities

Design, implement, and validate new features and numerical methods within Wakis.
Coordinate and prioritise development activities in collaboration with supervisors and users.
Perform electromagnetic simulations of accelerator components for wakefield and beam coupling impedance studies.
Benchmark Wakis results against commercial EM solvers and analytical models.
Contribute to the construction, validation, and maintenance of impedance models for CERN accelerators.
Support and technically supervise junior students working on Wakis-related simulation tasks.
Review contributions from other developers and assist with code integration and testing.
Improve documentation, examples, and user workflows for Wakis.
Present progress and results in internal meetings and working groups.

Still here? Let's make a quick check about

Your profile

Solid background in electromagnetics and/or computational physics.
Numerical simulations and scientific computing.
Familiarity with Git and collaborative software development workflow.
Open-source software development.
Knowledge of accelerator physics, wakefields, or beam coupling impedance is an asset.
Your studies focused on Physics, Engineering.

Your skills

Knowledge of electromagnetic simulation tools (e.g. CST, HFSS, COMSOL, or similar).
Programming experience in Python.
Familiarity with numerical methods and scientific computing.
Problem solving mindset and ability to learn new tools quickly.
Good communication skills and willingness to support and mentor junior students.
Spoken and written English or French, with a commitment to learn the basics of the other language

Ideal start date: 01/06/2026

Contract duration (in months): 24

Job flexibility: Hybrid

Team supervision

Global Benefits at CERN

A monthly stipend between 6372-7004 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.

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. Currently, we cannot consider applications from Pakistani and Lithuanian nationals for positions with a 2026 start date, as the ceiling defined under Article II.5 of the Associate Membership Agreement has been reached.
By the application deadline, you have a master’s degree with 2 to 6 years of professional experience since graduation or a PhD with a maximum of 3 years of professional experience since graduation. You are not eligible with only a bachelor’s degree.
You have never had a CERN fellow or graduate contract before.
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)
A copy of your most relevant diploma or a certificate of achievement from your school (if you don't yet have your paper diploma)
Any document you consider relevant to your application

Your CERNDepartment

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

Its mission is to lead the development, construction, and operation of advanced particle accelerators, and to provide cutting-edge technology solutions that enable new discoveries in fundamental physics. Committed to promoting a culture of excellence, creativity and collaboration, individuals from diverse backgrounds contribute to the advancement of science and technology, as well as engaging in scientific education, outreach, and broader knowledge and technology transfer initiatives.

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.