Mechanical Engineer CMS BTL integration (EP-2024-65-GRAP)

Posted on


Graduate / traineeship

Reference Number


Job Description

Your responsibilities

We are seeking a Mechanical Engineer to work on the integration of the Barrel Timing Layer (BTL) detector for the Phase II upgrade of the Compact Muon Solenoid (CMS) experiment at CERN. The BTL is a novel detector that will use a sophisticated CO2 cooling system and Thermoelectric Coolers (TEC) for thermal management.

As Mechanical Engineer in charge of the BTL integration you will: 

  • Oversee and contribute to the integration of the BTL detector on the CERN Meyrin site. In particular, you will be responsible for the assembly and quality control of the detector mechanics, cooling infrastructure and mechanical interfaces to CMS.
  • Be in charge of the any design changes or updates to the interfaces between the BTL and the rest of the CMS detector, including supporting mechanical elements, tooling, thermal interfaces and service channels. You will be responsible for the final engineering design of the interfaces, their validation with mock-ups, and the fabrication and quality control of the final structures.
  • Coordinate the work of personnel at CERN, collaborate closely with senior mechanical and electrical engineers as well as researchers from collaborating institutions and with the CMS Technical Coordination team
  • Facilitate the integration of colleagues from collaborating institutes who will join the Tracker integration effort at CERN - supervise CERN graduates and students.

Your profile

Skills and/or knowledge


  • Proven experience in construction and assembly of mechanical systems.
  • Experience with high-pressure fluid systems would be an advantage.
  • Demonstrated experience in preparation and management of complex 3D models of large CAD assemblies. Experience with CATIA V5.
  • Proven experience in preparation of manufacturing drawings, according to ISO GD&T standards.
  • Proven experience in structural and thermal analysis, including finite-element methods and analytical calculations. Experience with ANSYS.
  • Proven experience in the simulation, integration and testing of Thermoelectric Coolers.
  • Experience in working in multi-disciplinary teams, participation in workshops and meetings

Technical competencies: 

  • Design and analysis of mechanical structures.
  • Knowledge and application of numerical modelling in solid mechanics.
  • Production of 2D drawings and 3D models.
  • Manufacturing and fast prototyping of mechanical parts, using 3D printing and machining
  • Fluent in English, the ability to work in French would be an advantage.

Eligibility criteria:

  • You are a national of a CERN Member or Associate Member State.
  • You have a professional background in Mechanical engineering (or a related field) and 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.
  • You have never had a CERN fellow or graduate contract before.

Additional Information

Job closing date: 18.04.2024 at 12:00 AM (midnight) CEST.

Job reference: EP-2024-65-GRAP

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Target start date: 01-July-2024

This position requires:

  • Work during nights, Sundays and official holidays.
  • Work in Radiation Areas.
  • Interventions in underground installations.
  • Residence in the immediate vicinity of the Organization's installations.
  • A valid driving licence.

What we offer

  • A monthly stipend ranging between 6194 and 6808 Swiss Francs per month (net of tax).
  • Coverage by CERN's comprehensive health scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
  • Depending on your individual circumstances: installation grant; family, child and infant allowances; payment of travel expenses at the beginning and end of contract.
  • 30 days of paid leave per year.
  • On-the-job and formal training at CERN as well as in-house language courses for English and/or French.

About us

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

We are on a Quest. A Journey into discovery like no other. Bring your expertise to our unique work and develop your knowledge and skills at pace. Join world-class subject matter experts on unique projects, in a Quest for greater knowledge and deeper understanding.

Begin your CERN Quest. Take Part!


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.

More Information

Posted on


Graduate / traineeship

Reference Number



Geneva, GENEVA, CH

Genève , Switzerland