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CO2 Detector Cooling Operations Engineer (EP-DT-FS-2021-78-LD)

Geneva (Switzerland)

  • Organization: CERN - European Organization for Nuclear Research
  • Location: Geneva (Switzerland)
  • Grade: Level not specified
  • Occupational Groups:
    • Operations and Administrations
    • Engineering
  • Closing Date: 2021-07-28

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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 a qualified and proactive CO2 Detector Cooling Operations Engineer, willing to become an expert in the mechanical design, testing, qualification and operation of CO2 cooling equipment for one of the world's most complex and exciting scientific experiments? Then this opportunity is for you. Join the largest particle physics research laboratory in the world. Take part!

You will join:

  • The Experimental Physics (EP) Department, which carries out basic research in the field of experimental particle physics in a stimulating scientific atmosphere, standing as an important reference for the European physics community. It also contributes to the education and training of young scientists.
  • The Detector Technologies (DT) group, which is in charge of the development, construction, operation and maintenance of many particle detectors and their technical infrastructure for the different experiments at CERN. EP-DT Website:
  • The Fluidic Systems (FS) section is in charge of the design, construction, operation and maintenance of fluidic systems (gas & cooling) for detectors in CERN experiments. It performs selective R&D in areas relevant to novel detector thermal management, gas systems, and for the upgrade of the existing systems in view of higher detector performances and sustainable operation.


As CO2 Detector Cooling Operation Engineer in DT-FS Section, you will join the detector cooling team in the daily operation of the CO2 cooling systems for the ATLAS experiment at the Large Hadron Collider (LHC). Silicon based sensors require active cold cooling systems 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 ensure proper functionality. You will support detector testing, setup assembly and R&D activities, including cooling system connection, qualification and thermodynamic data analysis. For specific projects, you will join the teams in charge for design and construction of new cooling system and make the link between the construction team and the experiment.

You will:

  • Play an important role in the operation of the CO2 detector cooling systems for detector R&D and assembly for both new tracking and timing detectors;
  • Coordinate the connection of the detectors to the cooling plants and define and support the acceptance tests;
  • Support detector thermal analysis including CO2 2-phase flow analyses, both via theoretical simulations and laboratory testing;
  • Participate in the cooling system technical design, commissioning including final system of ATLAS Phase II upgrade;
  • Play a key role in cooling system component and system testing including data analyses and reporting;
  • Participate in the commissioning of various cooling systems.


Bachelor's degree or equivalent relevant experience in the field of mechanical engineering or a related field.


The experience required for this post is:

  • Proven experience in design, commissioning and operation of CO2 cooling systems, preferably non-industrial detector cooling systems including safety requirements and procedures;
  • Proven experience in mathematical modelling of single phase and 2-phase fluids and thermal calculations;
  • Experience in planning and coordinating of the fabrication and assembly of mechanical and fluidic systems;
  • Hands -on experience for cooling system maintenance and construction.

Technical competencies:

  • Knowledge and application of thermal and/or fluid measurement techniques;
  • Design, analysis and optimization of fluid mechanics systems, including 2-phase flow analyses;
  • Design and construction of piping networks: and pressurized enclosures;
  • Knowledge and application of joining techniques: brazing and soldering and welding.

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; sharing knowledge and expertise freely and willingly with others; coaching others to ensure knowledge transfer;
  • Solving problems: identifying, defining and assessing problems, taking action to address them; finding the information needed to solve problems; making objective judgments based on all the facts available; producing workable and timely solutions that meet requirements;
  • 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:

Spoken and written English or French: ability to draw up technical texts in one of the two languages, as well as ability to understand and speak the other language in professional contexts.

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 28.07.2021 at 12PM CET (noon Geneva time)

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

Job grade: 4-5

Job reference: EP-DT-FS-2021-78-LD

Benchmark Job Title: Mechanical Technical Engineer

Please make sure you have all the documents needed to hand as you start your application, as once it is submitted, you will not be able to upload any documents or edit your application further

We do our best to provide you the most accurate info, but closing dates may be wrong on our site. Please check on the recruiting organization's page for the exact info. Candidates are responsible for complying with deadlines and are encouraged to submit applications well ahead.
Before applying, please make sure that you have read the requirements for the position and that you qualify.
Applications from non-qualifying applicants will most likely be discarded by the recruiting manager.

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