Source and Linac Physicist

What you'll do

Within the Beam department (BE) and the Accelerator and Beam Physics group (ABP), join the Hadron Sources and Linacs section (HSL) at CERN as a lead applied physicist overseeing the Linac3 ion source, a role bringing together multiple physics domains coupled with beam dynamics, including high voltages, high magnetic fields, plasma heating with microwaves, the delivery of gases and vapours into vacuum systems as well as x-ray generation and shielding. You will ensure the high-performance delivery of heavy ion beams, driving both daily operations and long-term technical development of the system providing particle beams for one of the world’s most unique accelerator complexes, serving fixed-target users and the LHC.

Your responsibilities

Coordinate and participate in the Linac3 ion source assembly and maintenance activities during technical stops and shutdowns to ensure preparation for high-availability operation.
As the expert in-charge, commission and operate the source, tuning it precisely to optimize performance and stability for Linac3 and the downstream injectors, ensuring compliance with beam quality specifications for CERN ion runs and various tests.
Design and implement technical solutions to test and validate the production of different ion species requested for future physics programmes.
Be part of the machine expert team, contributing to broader beam operations and participating in the on-call service rotation to ensure 24/7 injector reliable operation.
Supervise and mentor a multidisciplinary team including physicists, engineers, technicians and students.
Conduct advanced beam measurements and data analysis to characterize Linac3 performance and identify areas for optimisation.
Contribute to the design studies and execution of upgrades for the CERN ion injector complex, focusing on source technology and low energy beam transport (LEBT).
Contribute to other BE-ABP-HSL activities through beam dynamics design, simulations and commissioning for present and future hadron linacs and sources under the section’s responsibility.

Still here? Let's make a quick check about

Your profile

Demonstrated experience of work in the design and/or operation of particle sources for accelerators or in a related scientific field.
Hands-on experience with particle sources or other similar scientific equipment, including the use of different materials for equipment design and handling for equipment use in vacuum.
Hands-on experience with high-voltage equipment or microwave generators.
Experience with multi-particle simulation codes for sources and linacs. Experience with one or more the following codes would be an asset: IBSIMU, SIMION, TRAVEL, TRACEWIN, PARMTEQ, RF-TRACK.
Experience of experimental techniques and analysis of beam measurements data.
Master's degree or PhD or equivalent relevant experience in the field of Applied Physics, Engineering or a related field.

Your skills

Simulation, design and development of beam sources.
Operation of accelerators.
Analysis and optimisation of accelerator performance.
Configuration and implementation of industrial data-acquisition, monitoring and control systems.
Organisation, planning and control.
Takes responsibility for own actions and decisions.
Addresses complex problems by breaking them down into manageable components.
Delivers presentations in a structured and clear way; adjusts style and content to the audience; responds calmly and confidently to questions.
Makes timely decisions that balance systematic analysis with decisiveness; deals with difficulties in a timely manner.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/09/2026

Contract duration (in months): 60

Grade range: 6

Benchmark job: 200140 - Applied Physicist

Job flexibility: Hybrid

Team supervision

Medical hazard

Exposure to electromagnetic fields under certain exposure conditions.
Exposure to lead.

Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed.

Employment conditions

A valid driving licence.
Work in Radiation Areas.
Interventions in underground installations.

Global Benefits at CERN

A minimum net entry-salary of 9236 Swiss Francs per month, 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. 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.
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.

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!

Ready To apply?

Be prepared with our resources and tips

All good?

Apply now Allow 15 minutes to complete your online application

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.