Applied Physicist

Job Posting Organization:
CERN, the European Organization for Nuclear Research, is a leading scientific research institution established in 195

• It is located in Geneva, Switzerland, and is known for its groundbreaking work in particle physics. CERN employs thousands of scientists, engineers, and support staff from over 100 countries, fostering a collaborative environment that encourages innovation and diversity. The organization operates numerous research facilities and experiments, including the Large Hadron Collider, and is dedicated to pushing the frontiers of science and technology. CERN's mission is to uncover the fundamental structure of the universe and to promote international collaboration in scientific research.

Job Overview:
The position of Applied Physicist at CERN involves contributing to the enhancement of a Penning trap used in the HIE-ISOLDE post-accelerator. The successful candidate will be responsible for accumulating, cooling, and bunching high-intensity radioactive ion beams prior to charge breeding and acceleration. This role requires a blend of mechanical design, quality assurance, and functional testing, alongside theoretical and hands-on activities in ion-trapping physics. The physicist will work within a small, collaborative team, applying their expertise to improve the performance of the Penning trap and engage in experimental studies with Paul traps. The position offers an opportunity to engage in simulations of non-neutral plasmas and to implement modifications aimed at increasing transmission efficiency.

Duties and Responsibilities:
The Applied Physicist will be tasked with producing a complete spare of the internal drift-tube structure of a Penning trap. They will investigate and identify the reasons for occasional discharges occurring inside the trap and suggest and implement mitigating actions. The physicist will also propose modifications to the injection stage to enhance the general transmission efficiency from approximately 50% to over 80%. Additionally, they will implement models of a Penning trap and Electron Beam Ion Source in the particle tracking program RF-Track and conduct space-charge investigations. The role includes following the acceptance test of an externally purchased superconducting solenoid, focusing on magnetic field measurements and operational aspects. Participation in cooling and bunching tests of light ions inside an RFQ cooler-buncher of Paul trap type is also required.

Required Qualifications:
Candidates must have profound experience in the operation of Penning traps and hardware interventions. Previous work with CAD programs is essential, along with experience in Particle-In-Cell simulation programs or similar for charged particles. Familiarity with high-voltage installations and knowledge of RFQ cooler-bunchers and Paul traps are also required. The ideal candidate will possess an in-depth understanding of Penning traps and non-neutral plasmas, as well as mechanical design skills using BricsCAD, CATIA, or similar design programs. Proficiency in Python and experience with CST particle tracking, RF-track, or similar charged particle simulation packages are also necessary.

Educational Background:
Candidates must be nationals of a CERN Member or Associate Member State and possess a professional background in Physics (applied, experimental, or accelerator physics, or a related field). They should 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. It is important that candidates have never held a CERN fellow or graduate contract before.

Experience:
The position requires candidates to have a significant level of experience, specifically in the operation of Penning traps and related hardware interventions. A background in experimental physics, particularly in accelerator physics, is highly desirable. Candidates should have a proven track record of working with complex scientific equipment and conducting simulations relevant to charged particles.

Languages:
Fluency in spoken and written English or French is mandatory, with a commitment to learn the basics of the other language being a plus. This bilingual requirement ensures effective communication within the diverse international team at CERN.

Additional Notes:
The contract duration for this position is 24 months, with a possible extension of up to 36 months. The working hours are set at 40 hours per week, and the job offers hybrid flexibility. The target start date for this position is May 1, 202

• Candidates should be aware that this role involves work in radiation areas and exposure to electromagnetic fields under certain conditions. Therefore, obtaining medical clearance is a prerequisite before a contract offer can be confirmed. The job reference for this position is BE-ABP-PEC-2026-38-GRAP. The compensation includes a monthly stipend ranging from 6372 to 7004 Swiss Francs, which is tax-free, along with 30 days of paid leave per year, comprehensive health insurance coverage, and various allowances depending on individual circumstances.