Power System Physicist/Engineer for the CMS HGCAL (EP-CMS-EC-2026-189-LD), Geneve

Company Description

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. The process gives physicists clues about how particles interact, and provides insights into the fundamental laws of nature.

Job Description

Introduction:

As Power System Physicist/Engineer for the CMS High-Granularity Calorimeter (HGCAL), you will play a key role in the development, integration, testing and commissioning of the power systems for one of the most innovative particle detectors ever conceived.

Working within a multinational, multidisciplinary team, you will contribute to the procurement and testing of power supplies for HGCAL detector modules, including low-voltage, high-current supplies for the readout electronics and medium-voltage supplies of up to 800 V for sensor biasing.

You will also contribute to the integration of power systems with the detector’s safety, control and monitoring systems, as well as the testing and implementation of power components such as DC-DC converters, voltage regulation and cabling.

A key aspect of the role will be to assess the impact of the power system on HGCAL performance and to develop and implement strategies to minimise noise effects such as interference, coupling and ripple.

This role offers the opportunity to combine strong electrical engineering and detector-physics skills with hands-on involvement in the construction, testing and commissioning of a large-scale, state-of-the-art particle detector.

Functions:

Follow the procurement of the power supplies (Low Voltage and Bias Voltage, totalling several MCHF), including carrying out acceptance and stress tests on the delivered units.Support the commissioning of these power systems during the mass assembly and testing phases of HGCAL.Work with physicists and engineers to evaluate the performance of HGCAL in relation to its power systems and to develop and implement mitigation strategies where possible and necessary, first on the surface and subsequently when HGCAL is installed in CMS, 100 metres underground.Work with the HGCAL and central CMS Technical Coordination teams to oversee the installation and testing of the power systems underground in the “Service” and “Experimental” caverns. This will include overseeing cable installation, in-situ connectorisation where needed, testing and commissioning, and the integration of the power system into the HGCAL and CMS safety and monitoring systems.

Qualifications

Master's Degree or PhD or equivalent relevant experience in the field of Applied Physics, Electrical Engineering or a related field.

Experience:

Strong track record in testing, operating and debugging power systems for complex devices, such as particle detectors used in high-energy physics experiments.Experience with silicon- and/or scintillator-based particle detectors would be an advantage.Experience with large-scale procurement of electronic systems, such as power supplies.Ability to work successfully and efficiently within multinational, multicultural teams of engineers, scientists and technicians would be an advantage.

Technical competencies:

Construction, test and installation of power electronic components and systems.Specification and follow-up of technical aspects of a contract.Testing and validation of detector components..

Behavioural competencies:

Managing Self: taking initiative beyond regular tasks and making things happen.Solving Problems: assimilating large quantities of information, identifying key issues and formulating conclusions clearly and concisely.Working in Teams: working well in groups and readily fitting into a team; participating fully and taking an active role in team activities.Achieving Results: having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind.Communicating Effectively: ensuring that information, procedures and decisions are appropriately documented.

Language skills:

Spoken and written English, with a commitment to learn French.

Additional Information

Eligibility and closing date:

Diversity has been an integral part of CERN's mission since its foundation and is an established value of the Organization. Employing a diverse workforce is central to our success. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 07.10.2026 at 23:59 CEST.

Employment Conditions:

Contract type: Limited duration contract (4 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

Working Hours: 40 hours per week

Job Flexibility: Fully Onsite

This position involves:

Work in Radiation Areas.Interventions in underground installations.A valid driving licence.Work during nights, Sundays and official holidays, when required by the needs of the Organization.

Job grade: 6-7

Job reference: EP-CMS-EC-2026-189-LD

Field of work: Experimental Physics

Benchmark Job Title: Electrical Engineer

Global Benefits

A competitive salary (tax free), 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.

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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.

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