Mechanical Engineer for cooling systems (EP-DT-FS-2022-71-LD)

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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. Find out more on

Job Description


Are you interested in the challenges of designing, operating and maintaining complex fluidic systems for particle physics detectors? Do you want to participate in the development of the next generation CO2 cooling systems to cope with the most demanding requirements of the HL-LHC experiments? Take part!

You will join:

  • The Experimental Physics Department.
  • The Detector Technologies (DT) group, which participates in the development, construction and operation of particle detectors for experiments at CERN. This comprises detector consolidation and upgrade projects as well as infrastructure and services for experiments.
  • The Fluidic Systems Section is charged to design, prototype, construct, commission, operate and maintain fluidic systems (gas & cooling) for detectors in CERN experiments. In particular the section is requested to launch in production the new CO2 cooling systems for the Phase 2 upgrades of the ATLAS and CMS experiments, and to complete their installation and commissioning in connection with the detectors by the end of Long Shutdown 3.


As Mechanical Engineer in the Fluidic Systems Section, initially you will:

  • Play a key role in the update and maintenance of the process for the final CO2 detector cooling systems for the Phase 2 upgrades of ATLAS and CMS. This includes supporting the Project Leader in the selection and procurement of the required components.
  • Participate in the design, construction, and testing of the CO2 cooling systems for the Phase 2 upgrades of the ATLAS and CMS experiments.
  • Perform and oversee parametric process simulations related to the projects under design, including full control mirroring for the planned implementation of virtual commissioning.

At a later stage, you will:

  • Contribute to the follow-up of the outsourced construction of the ATLAS and CMS cooling systems.
  • Participate in the commissioning and operation of CO2 cooling systems, including participation in the section stand-by duty service.
  • Participate in the innovation effort of the section toward cooling systems for future detector upgrades.


Master's degree or PhD or equivalent relevant experience in the field of Mechanical Engineering or a related field.


  • Demonstrated experience in process design of complex fluidic systems (preferably CO2 cooling systems).
  • Proven practice in mechanical and/or thermal calculations.
  • Experience in operation and maintenance of detector cooling systems.
  • Experience in participating in projects involving multiple academic and/or industrial partners.

Technical competencies:

  • Knowledge and application of thermal and/or fluid measurement techniques: with emphasis on refrigeration systems.
  • Design, analysis and optimization of thermal systems.
  • Design, construction, operation and maintenance of detector cooling systems: with focus on low temperature CO2 cooling systems.

Behavioural competencies:

  • Achieving results: having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind Delivering prompt and efficient service taking into account customer needs.
  • Learning and sharing knowledge: proposing ways to improve or streamline existing procedures, processes and methodologies.
  • Demonstrating flexibility: demonstrating openness to new ideas and situations
  • Working in teams: working well in groups and readily fitting into a team; participating fully and taking an active role in team activities.

Language skills:

Spoken and written English or French: ability to understand and speak the other language in professional contexts. Ability to draw-up technical specifications and/or scientific reports and to make oral presentations in at least one of the two languages.

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 08.08.2022 at 12:00 (mid-day) CET.

Employment Conditions

Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

These functions require:

  • Participation in a regular stand-by duty, including nights, Sundays and official holidays.
  • Work in Radiation Areas.
  • Work during nights, Sundays and official holidays.
  • Interventions in underground installations.
  • A valid driving licence is required.

Job grade: 6-7

Job reference: EP-DT-FS-2022-71-LD

Benchmark Job Title: Mechanical Engineer

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Geneva, GENEVA, CH

Genève , Switzerland