High-Level Trigger Calibration Scientist (EP-CMS-TDQ-2026-150-GRAP)

CERN; Genf; Hybrid; CHF 71.000 - 78.000; Vollzeit

Benefits dieser Stelle

Net monthly stipend CHF 6,372–CHF 7,J0

30 days leave + 2 weeks annual closure

Health insurance ( CERN Pension Fund )

Family allowances

Relocation package

Contract extension up to 36 months

On-the-job and formal training

Zusammenfassung

CERN in Geneva invites applications for a High-Level Trigger Calibration Scientist (EP-CMS-TDQ-2026-150-GRAP). The position is full-time with a hybrid work model, 40 hours per week, 24 months with possible extension.

You will develop calibration workflows, work with CMS DPGs/POGs, maintain the NGT Demonstrator, design production-grade systems, test integrations, and contribute to reports on online calibrations' impact on physics performance.

Qualifikationen

• Experience in the design, development, and validation of calibration workflows for high-energy physics experiments.
• Knowledge of Python and C++ programming, and database management systems.
• Experience with Trigger and Data Acquisition (TDAQ) systems and associated hardware.
• Practical experience developing software algorithms within an integrated framework.
• Proficient use of GitHub, GitLab and CI practices.

Aufgaben

• Work with CMS DPGs and POGs to develop and improve calibration algorithms.
• Maintain the NGT Demonstrator System and ensure operability in replay mode.
• Contribute to the design of production-grade NGT Data Acquisition and Calibration System.
• Integrate and test the system within the CMS online infrastructure.
• Conduct thorough testing of the NGT system across operational scenarios.
• Produce reports evaluating the impact of online calibrations on physics performance.
• This role includes team supervision responsibilities.

Kenntnisse

Calibration workflows

Python

C++

TDAQ systems

GitHub/GitLab

CI/CD practices

Distributed computing

Ausbildung

Master's degree in Applied Physics

PhD in a related field

Tools

GitHub

GitLab

CI/CD pipelines

Databases

Jobbeschreibung

High-Level Trigger Calibration Scientist (EP-CMS-TDQ-2026-150-GRAP)

• Full-time
• Compensation: CHF 6372 - CHF 7004 - monthly

The Compact Muon Solenoid (CMS) experiment's High-Level Trigger, as deployed during the LHC's 2009-2026 running period, reconstructs high-energy proton-proton collision events using detector conditions that often lag behind the best available calibrations. Closing that gap by delivering near-real-time, offline-quality calibrations to the online system, also known as "Optimal Calibrations," is one of the central challenges of High-Luminosity (HL)-LHC operations, and it is the challenge this role will face.

• Work with the CMS Detector Performance Groups (DPGs) and Physics Object Groups (POGs) to develop new and improve calibration algorithms.
• Maintain the successful NGT Demonstrator System, developed during LHC Run 3, ensuring it remains operational and capable of running in replay mode against archived data throughout Long Shutdown 3.
• Building on the NGT Demonstrator System experience, contribute to the design of a realistic, production-grade NGT Data Acquisition and Calibration System implementing the Optimal Calibrations required for CMS's High-Level Trigger during the HL-LHC era. This includes exploring the design space across different compute and storage availability scenarios.
• Integrate and test the production-grade system within the CMS online infrastructure, working closely with system administrators and software engineers to ensure seamless compatibility.
• Conduct thorough testing of the NGT system in a realistic environment, simulating various LHC and CMS operational scenarios to assess performance and reliability.
• Produce detailed reports evaluating the impact of improved online calibrations on the physics performance of the High-Level Trigger.
• This role includes team supervision responsibilities.

Your profile

• Experience in the design, development, and validation of calibration workflows for high-energy physics experiments.
• Knowledge and application of Python and C++ programming, as well as database management systems.
• Experience with Trigger and Data Acquisition (TDAQ) systems, including their hardware and associated tools.
• Practical experience developing software algorithms within an integrated framework.
• Proficient use of software development tools (e.g. GitHub, GitLab) and continuous integration practices.

Skills

• Knowledge of modern Git, Python, and C++.
• Basic knowledge of DevOps and Continuous Integration (CI).
• Familiarity with high-energy collider and detector operations.
• Basic knowledge of high-energy physics.
• Spoken and written English, with a commitment to learn French.

Eligibility criteria:

• You have a professional background in Applied Physics (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.

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

Working hours: 40 hours per week

Job flexibility: Hybrid

This position involves:

• Work during nights, Sundays and official holidays, when required by the needs of the Organization.

Job reference: EP-CMS-TDQ-2026-150-GRAP

Field of work: Applied Physics

Benchmark job: 200140 - Applied Physicist

• A monthly net stipend of either 6372 or 7004Swiss Francs per monthdepending on your degree.
• 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 and travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 36 months.
• On-the-job and formal training including language classes.

Overview of CERN -Discover a world where the impossible is made possible!

At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive.

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.

If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe!