Mechanical Technician for Cooling Systems (EP-ADO-PO-2024-78-LD) , CERN , Geneva

negotiable / YEAR Expired 2 days ago
This job has expired.


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

Job Summary

Are you a Mechanical Technician, experienced in cooling systems and/or in fluidic system’s pipe assemblies, with a passion for challenging problems? Then take this opportunity to further develop your knowledge and skills in the cooling systems construction, testing, qualification and operation for one of the world’s most complex and exciting scientific experiments.

You will join the:

  • Experimental Physics (EP) Department which carries out research in the field of experimental particle physics, standing as an important reference for the European physics community.
  • ADO group, in charge of the coordination of all the engineering activities and, in charge of ATLAS Detector Operation during the run (
  • PO section: is the ATLAS Technical Coordination Project Office, which is in charge of the design, the integration, the installation, and the maintenance coordination of many infrastructure facilities for ATLAS Experiment.

Currently the PO section is facing new technical challenges to prepare the Long Shut down 3 (LS3) (2026-2028). ATLAS detector will be upgraded with new detector systems, which will require intensive field activities.

Various detectors require active cold or warm cooling systems in range of several to hundreds of kilowatts cooling power. The detector cooling systems operate 24/7 keeping the electronics and sensors in desired thermal conditions to avoid the outcome of radiation damage.

With the end of the agreements between CERN and Russia, mandatory responsibilities need to be covered for the experiments. CERN agreed to support the experiments with posts from a special Russian compensation fund. The needs for the ATLAS experiment arising from the fact that Russian Institutes left are manifold, highest priority is to cover technical work for the ATLAS Phase-2 Cooling Systems, for which this post is foreseen.

You will be dealing with innovative refrigeration technologies for the ATLAS detector. Your daily activities will focus on water cooled systems, CO2 and monophase detector cooling applications. As member of ATLAS cooling team, you will be involved in various types of activities spreading from pipe assembling, leak searching, cooling lines installation and insulation, operation, and installation work follow-up as well as reporting.


The functions include:

  • Carrying out of operation, maintenance, repair, testing and modification of major systems or equipment;
  • Fault-finding and elaborating repair solutions;
  • Participating in the on-call service;
  • Manufacturing, tests and installation of pipes and manifold boxes;
  • Making sure that all necessary safety measures are taken on work sites;
  • Preparing and carrying out acceptance tests.


Higher technical diploma or equivalent relevant experience in the field of mechanics or a related field.

Driving license (min. category B)


  • Experience in piping systems assemblies in large apparatus
  • Experience in operation of cooling equipment
  • Experience in metal work and basic machining

Technical competencies:

  • Operation and maintenance of cooling water systems
  • Design, construction, operation and maintenance of detector cooling systems
  • Design and construction of piping networks
  • Manufacturing of mechanical parts
  • Knowledge and application of joining techniques: welding: would be an asset

Behavioural competencies:

  • Managing Self:
    • Taking initiative beyond regular tasks and making things happen,
  • Achieving Results:
    • Driving work / projects along and seeing them through to their conclusion,
  • Learning and Sharing Knowledge:
    • Taking steps to expand knowledge in other areas of expertise beyond own field,
  • Working in Teams:
    • Cooperating constructively with others in the pursuit of team goals; balancing personal goals with team goals,
    • Supporting and acting in accordance with team decisions; accepting joint responsibility for team successes and shortcomings.

Language skills:

  • Ability to understand and speak English or French in professional contexts, willingness to improve the level of the weakest language is expected.
  • The knowledge of other languages would be a strong asset.

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 24/06/2024 at 23:45.

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:

  • 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.
  • Stand-by duty, when required by the needs of the Organization.

Job grade: 3-4

Job reference: EP-ADO-PO-2024-78-LD

Benchmark Job Title: Mechanical Technician

WORK HOURS: 8 Hours a Day

Geneva, Switzerland
This job has expired.