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Researcher (post-doctoral) in particle physics - TESSERACT and Ricochet project
Description
You will strengthen the team's contribution to the cryogenic R&D efforts underway in France targeting the direct
You will enhance the team contribution to the R&D cryogenic efforts ongoing in France targeting direct dark matter searches. Currently the team works on RICOCHET, CRYOSEL and the design study and feasibility of TESSERACT at LSM.
The RICOCHET experiment aims to provide the first high-precision measurement (at the percent level) at very low energy (
You will be actively involved in simulations and analysis of the simulated data of the RICOCHET experiment. You will play a leading role in understanding the environmental backgrounds inside the RICOCHET cryostat. Taking into account the radioactive processes associated with the activity of the materials surrounding the cryostat is crucial to estimate the background noise of the experiment. One of the main tools for these studies is the use of extensive simulation work. For a given experiment, this allows to study strategies for suppressing or rejecting background noise, to study requirements for active or passive shielding, purity of materials, efficiency of veto detectors, etc. The RICOCHET group at LPSC actively contribute to the efforts to understand and limit the radioactive background via MonteCarlo simulations with GEANT. Models including the main shielding model and estimates of gamma and neutron backgrounds outside RICOCHET have already been developed. The postdoc will help expanding the ongoing effort in the GEANT4 simulations in terms of radioactive background induced by any material surrounding the detectors to better understand and estimate the radioactive background budget of the experimental apparatus. Simulation results will be then analysed to get ready for the comparison with the first data campaign in 2024.
A similar GEANT4 framework will be exploited for sensitivities studies of RICOCHET germanium detector at the Modane underground laboratory (LSM) for direct dark matter (DM) searches within the TESSERACT project. The TESSERACT project will search for individual galactic DM particles below the proton mass through interactions with advanced, ultra-sensitive detectors. Currently TESSERACT is in a design phase aiming at exploring DM mass parameter space down to 10 MeV, with upgrade paths to sub-MeV. It will be sensitive to both nuclear recoil DM and electron recoil. Multiple target materials will be used, sharing identical readout. In addition to maximizing sensitivity to a variety of DM interactions, this provides an independent handle on instrumental backgrounds.
The TESSERACT project requires an initial period of targeted R&D to make technical choices and retire technical risks, leading to a well-defined set of design parameters with baseline values. You will participate to this effort.
Candidates must hold a PhD degree in Particle Physics and an excellent record of successful work in the field, including experience in data analysis and programming skills
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