Your responsibilities
The Radio Frequency Group (RF) of CERNs Accelerator Systems Department (SY) is seeking an Applied Physicist to join the Superconducting Radio Frequency Cavity Technology Section (SRF). You will work with a small focused team to investigate and leverage the superconducting properties of thin and multilayer film structures and improve the performance of SRF cavities.
The primary focus is on the manipulation and expulsion of magnetic flux vortices within the superconducting film and assessing the role of thermal currents in their dynamics. This is a challenging multi‑disciplinary project where you will take a lead role in developing the underlying physical model operating CERNs Magnetic Flux Lens (MFL) setup and analysing the resulting data. Ultimately your work will contribute to a pragmatic understanding of superconductivity with significant application to SRF research.
Of particular interest is the study of flux dynamics in thin film Niobium (Nb) on Copper substrates as well as more novel materials such as Nb3Sn and NbTiN in Superconductor‑Insulator‑Superconductor (SIS) structures.
Your activities will include
* Model Development : develop and refine the physical description of the dynamics of superconducting films at the superconducting transition.
* Multi‑physics Simulations : perform advanced simulations of superconducting films to understand their complex magneto‑thermal dynamics.
* Experimental Operations : conduct direct measurements of magneto‑thermal dynamics in thin‑film superconductors with CERNs MFL setup.
* Data Analysis and Correlation : analyse experimental data from MFL measurements to correlate findings with predictions from physical models.
* SRF Cavity Integration : extension of the sample‑based study to SRF cavity geometries and the isolation of substrate dependencies.
This role provides a broad multidisciplinary environment that bridges material science and SRF accelerator cavities offering significant opportunities for professional growth over a diverse experience base.
Your profile
Skills
* Multi‑physics simulations;
* Knowledge of superconducting materials;
* Operation of experimental setups;
* Data analysis;
* Good communication skills;
* Spoken and written English with a commitment to learn French.
Eligibility criteria
* You are a national of a CERN Member or Associate Member State.
* You have a professional background in Radio‑frequency Superconductivity (or a related field) and have either :
* a Masters 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 : 26.10.2025 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-January-2026
* Job reference : SY‑RF‑SRFGRAP
* 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 CERNs 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
At CERN the European Organization for Nuclear Research physicists and engineers are probing the fundamental structure of the universe. Using the worlds largest and most complex scientific instruments they study the basic constituents of matter - fundamental particles that are made to collide together at close to the speed of light. The process gives physicists clues about how particles interact and provides insights into the fundamental laws of nature.
We are on a Quest. A Journey into discovery like no other. Bring your expertise to our unique work and develop your knowledge and skills at pace. Join world‑class subject matter experts on unique projects in a Quest for greater knowledge and deeper understanding.
Diversity and Inclusion
Diversity has been an integral part of CERNs mission since its foundation and is an established value of the Organization. Employing a diverse workforce is central to our success.
Remote Work : No
Employment Type : Full‑time
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