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Validation of Monte Carlo simulation codes based on high precision experimental data H/F



Job description

Position description

Category

Intrumentation, metrology and control

Contract

Postdoc

Job title

Validation of Monte Carlo simulation codes based on high-precision experimental data H/F

Subject

CEA is hiring a post-doctoral researcher to work on the VALERIAN project over a period of two years.

The candidate will be hosted at SERMA and work in collaboration with all the CEA units involved in VALERIAN (see the next paragraph).

The post-doc activities will be focused on collecting and post-processing the experimental data related to the ITkPix modules (devoted to the ATLAS experiments for the LHC facility at CERN), and to develop a digital twin of the test bench based on Monte Carlo simulation tools.

New developments of the simulation codes themselves may be also initiated, if useful to the project.

Contract duration (months)

24

Job description

Accurately modeling the coupled propagation of electron and photon in matter is crucial in several of CEA's flagship programs, notably radiation shielding and nuclear instrumentation.

Such transport processes involve a very large number of interactions during the particle histories, which typically requires time-consuming Monte Carlo simulations.

These features call for the use of High-Performance Computing (HPC), which allows to obtain statistically meaningful results in reasonable times even for such complex processes.

The validation of simulation codes requires dedicated parametric studies and experimental measurements.

Given the scarcity of publicly available experimental data, comparisons between simulation codes are a common practice.

The TRIPOLI-4 Monte Carlo code, developed at CEA and largely used in reactor physics and radiation shielding, aims at extending its scope to nuclear instrumentation, and to improve its computational performance in an HPC context.

Some research units of CEA also use the MCNP and GEANT4 codes for radiation shielding and nuclear instrumentation applications.

The challenge in the coming years is to qualify these codes in a broad energy domain.

As part of this effort, preliminary investigations carried out at CEA revealed unexpected discrepancies between their results, in particular in scenarios involving the coupled transport of neutrons, photons and electrons.

The VALERIAN project is designed to address the observed discrepancies by taking advantage of a unique data collection campaign planned at CEA between 2025 and 2027.

CEA has committed to perform the quality control of at least 700 pixel modules for the new inner tracker of the ATLAS experiment, which is part of the major upgrade on-going at the CERN Large Hadron Collider (LHC).

Numerous measurements of crossing particle fluxes will be carried out with beta sources in 2025-2027 for the qualification of the modules.

The tests will be carried out at Saclay on a bench developed at CEA, ensuring the full control of the experimental parameters.

The small pixel pitch (50 μm) and the high performance of the ITkPix readout chips integrated into the modules will enable near state-of-the-art accuracy measurements.

The VALERIAN project aims at developing numerical twins of the IRFU test bench with TRIPOLI-4, MCNP and GEANT4, and to validate them using experimental data.

The members of the project will also contribute to the daily operations and optimization tasks of the IRFU test bench.


Methods / Means

Monte Carlo codes

Applicant Profile

PhD in one of the following fields: numerical simulation, nuclear physics or neutronics.


Position location

Site

Saclay

Job location

France, Ile-de-France, Essonne (91)

Location

Gif-sur-Yvette

Candidate criteria

Prepared diploma

Bac+8 - Doctor of philosophy (PhD)

Requester

Position start date

01/01/2026


Required Skill Profession

Life, Physical, And Social Science Technicians



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