Source and Linac Physicist (BE-ABP-HSL-2026-133-LD)

Lead Applied Physicist - Linac3 Ion Source

About CERN:
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. Using the world’s 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. This process gives physicists clues about how particles interact and provides insights into the fundamental laws of nature.

About the Role:
Join the Beam department (BE) and the Accelerator and Beam Physics group (ABP), specifically within the Hadron Sources and Linacs section (HSL), as a Lead Applied Physicist. You will oversee the Linac3 ion source, a critical role integrating multiple physics domains including high voltages, high magnetic fields, plasma heating with microwaves, gas delivery into vacuum systems, and X-ray generation and shielding. Your expertise will be crucial in ensuring the high-performance delivery of heavy ion beams, driving both daily operations and long-term technical development for one of the world’s most unique accelerator complexes, serving fixed-target users and the LHC.

Functions & Responsibilities:

• Coordinate and execute Linac3 ion source assembly and maintenance during technical stops and shutdowns to ensure high-availability operation.
• Act as the expert-in-charge for commissioning and operating the source, precisely tuning it for optimal performance and stability for Linac3 and downstream injectors, ensuring compliance with beam quality specifications.
• Design and implement technical solutions to test and validate the production of diverse ion species required for future physics programs.
• Contribute to broader beam operations as part of the machine expert team and participate in the on-call service rotation for 24/7 injector reliability.
• Supervise and mentor a multidisciplinary team comprising physicists, engineers, technicians, and students.
• Conduct advanced beam measurements and data analysis to characterize Linac3 performance and identify optimization opportunities.
• Contribute to design studies and execution of upgrades for the CERN ion injector complex, with a focus on source technology and low energy beam transport (LEBT).
• Engage in other BE-ABP-HSL activities, including beam dynamics design, simulations, and commissioning for current and future hadron linacs and sources.

Qualifications:

• Master’s degree or PhD or equivalent relevant experience in Applied Physics, Engineering, or a related field.

Experience:

• Demonstrated experience in the design and/or operation of particle sources for accelerators or related scientific fields.
• Hands-on experience with particle sources or similar scientific equipment, including material selection for vacuum environments and handling.
• Practical experience with high-voltage equipment or microwave generators.
• Experience with multi-particle simulation codes for sources and linacs (e.g., IBSIMU, SIMION, TRAVEL, TRACEWIN, PARMTEQ, RF-TRACK is an asset).
• Proficiency in experimental techniques and analysis of beam measurement data.

Technical Competencies:

• Simulation, design, and development of beam sources.
• Accelerator operation.
• Analysis and optimization of accelerator performance.
• Configuration and implementation of industrial data-acquisition, monitoring, and control systems.
• Organization, planning, and control.

Behavioral Competencies:

• Accountability: Taking ownership of actions and decisions.
• Problem-Solving: Addressing complex issues by breaking them down into manageable components.
• Effective Communication: Delivering clear presentations and responding confidently to questions.
• Leadership: Making timely, decisive choices and managing difficulties proactively.

Language Skills:

• Spoken and written English proficiency.
• Commitment to learn French.

Additional Information:

• Contract Type: Limited duration contract (5 years), with potential for conversion to an indefinite position.
• Working Hours: 40 hours per week.
• Job Flexibility: Hybrid.
• Special Conditions: Work in Radiation Areas, interventions in underground installations, valid driving license required, exposure to lead and electromagnetic fields, and medical clearance is mandatory before contract confirmation.
• Job Grade: 6-7.
• Job Reference: BE-ABP-HSL-2026-133-LD.
• Field of Work: Applied Physics.
• Benchmark Job Title: Applied Physicist.

Global Benefits:

• Competitive, tax-free salary that increases with relevant experience.
• 30 days of paid leave plus 2 weeks annual closure.
• Comprehensive CERN health insurance and Pension Fund membership.
• Monthly family, child, and infant allowances.
• Relocation package including installation grant, removal, and travel expenses.
• Potential contract extension up to 8 years with eligibility for indefinite tenure.

Diversity & Inclusion:
CERN values diversity as a core principle since its foundation. We welcome applications from all Member States and Associate Member States, fostering an inclusive environment where innovation and collaboration thrive. Be part of our mission to uncover what lies at the heart of the universe!