Level Trigger Calibration Scientist; EP-CMS-TDQ--GRAP

High-Level Trigger Calibration Scientist (EP-CMS-TDQ--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  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. Git Hub, Git Lab) and continuous integration practices.

Skills

• Knowledge of modern Git, Python, and C++.
• Basic knowledge of Dev Ops 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--GRAP

Field of work:
Applied Physics

Benchmark job: 200140 - Applied Physicist

• A monthly net stipend of either 6372 or 7004
  
  Swiss Francs per month depending 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)…