Computational Physicist

**Job Description** Your responsibilities**

Do you enjoy blending physics intuition with modern software tools? Would you like to tackle real-world challenges in one of the world's most complex machines?

This is an exciting opportunity to contribute to a growing software and modelling stack that integrates advanced beam dynamics with scalable, production-grade tools.

As a Computational Physicist, your role will include:
**1. Developing Physics Models**
- Building and refining beamline models using state-of-the-art Python-based tracking codes like Xsuite and Cheetah.
- Contributing to the development of simulation workflows that can be reliably deployed for studies and operation.

**2. Collaborating Across Domains**
- Working alongside experts in beam instrumentation, operations, control systems and data pipelines.
- Supporting conceptual design studies for new injection/extraction lines in next-generation accelerators.

**3. Integrating Advanced Methods using Python**

Exploring machine learning and numerical optimisation techniques, such as:

- Differentiable physics models.
- Bayesian optimisation.
- Digital twins for beamlines.
- Continuous integration & reproducible simulations.

**Your profile**

**Skills**:

- Experience with physics modelling, preferably in the context of accelerator physics.
- Strong programming skills in Python.
- Knowledge of good practices in software engineering: version control, CI/CD, testing.
- Ability to work in interdisciplinary teams and communicate technical ideas clearly.
- Familiarity with numerical optimisation and machine learning concepts.
- Spoken and written English or French, with a commitment to learn the basics of the other language.

Eligibility criteria:

- You are a national of a CERN Member or Associate Member State.
- You have a professional background in Physics, Engineering,Applied Mathematics (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.

**Additional Information**
Job closing date**:01.08.2025 at 23:59 CEST**.**

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Working hours: 40 hours per week

Target start date: 01-November-2025

Job reference: SY-ABT-BTP-2025-101-GRAP

Field of work: Applied Physics

**What we offer**
- A monthly stipend ranging between **6287** and 6911** Swiss Francs per month (net of tax)**.
- Coverage by CERN's comprehensive **health scheme** (for yourself, your spouse and children), and membership of the CERN **Pension Fund**.
- Depending on your individual circumstances: installation grant; family, child and infant allowances; payment of travel expenses at the beginning and end of contract.
- ** 30 days of paid leave per year**.
- On-the-job and formal training at CERN as well as in-house language courses for English and/or French.

**About us**

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