High-Level Trigger Calibration Scientist

Big Science Sweden; Genf; Vor Ort; CHF 90.000 - 140.000; Vollzeit

Zusammenfassung

CERN is seeking an experienced High-Level Trigger Calibration Scientist to develop and refine calibration algorithms for the CMS trigger, and to maintain the NGT Demonstrator System for replay against archived data. You will work with CMS groups to advance optimal calibrations for HL-LHC operations.

The role includes designing a production-grade NGT DAQ/calibration system, testing across realistic CMS scenarios, and delivering reports on calibration impacts for physics performance.

Qualifikationen

• Master’s degree with 2–6 years since graduation or a PhD with up to 3 years since graduation.
• Prior CERN fellowship/graduate contract is not applicable.
• Experience with high-level trigger systems and calibration workflows is advantageous.

Aufgaben

• Work with CMS DPGs and POGs to develop and improve calibration algorithms.
• Maintain the NGT Demonstrator System and ensure it runs in replay mode against archived data.
• Contribute to design of a production-grade NGT DAQ/calibration system for HL-LHC.
• Integrate and test the system within the CMS online infrastructure with admins and engineers.
• Conduct thorough testing in realistic operational scenarios and report performance.
• Produce detailed reports on how improved online calibrations impact physics performance.

Kenntnisse

Calibration algorithms

CMS HL Trigger

Data acquisition systems

System integration

Ausbildung

Master’s degree

PhD

Tools

NGT Demonstrator System

CMS online infrastructure

Jobbeschreibung

High-Level Trigger Calibration Scientist

Datum: 5 oktober, 2026 Tid: 11:59

Placering: CERN

Mer information

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. This position is part of the Next-Generation Trigger programme .

Your responsibilities

• 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.

Be sure to meet the eligibility criteria

• By the application deadline, you have a master’s degree with 2 to 6 years of professional experience since graduation or a PhD with a maximum of 3 years of professional experience since graduation. You are not eligible with only a bachelor’s degree.
• You have never had a CERN fellow or graduate contract before.
• Please pay attention to the additional criteria and requirements for this specific position and mentioned above.