Fonctionne avec Indico
v3.2.8
10h: Joshua Pinchault
Signal Formation Studies for DUNE Vertical Drift Far Detector Module
DUNE’s far detectors consist of 4 giant Liquid Argon Time Projection Chamber modules which can perform calorimetry and particle identification by collecting charges from the electron ionization. The second module will use the new Vertical Drift technology where the anodes are made of two stacked perforated printed circuit boards. Understanding the signal formation on this anode is therefore mandatory to improve the energy reconstruction.
We have developed a numerical simulation to study the induced signal and understand the dependencies of the signal strength and shape as a function of the track direction. The simulation is in good agreement with the data collected in 2023 with the Vertical Drift demonstrator at CERN, and anode transparency comparisons are ongoing. The impact of the transverse electron diffusion on the signal formation will be also discussed.
10h30: Martin Marone
Multiphysics modeling of the production, the transport and the separation of the fission products existing in the fuel salt of a Molten Salt Reactor (MSR)
This PhD work is being developed in the framework of the Innovative
System for Actinides Conversion (ISAC) project (2002-2026). The goal of
ISAC is to study an alternative approach to the transmutation of minor
actinides based on the use of a Molten Salt Reactor (MSR) with a fast
neutron spectrum. The PhD work will contribute to this project by
studying the Fission Products (FPs) behavior in a MSR and will include
both numerical and experimental work. The objective of the numerical
work is to develop a model that allows calculating the evolution of the
distribution of fissions products (FPs) in the fuel circuit of a Molten
Salt Reactor (MSR). The numerical model will have to take into account
all the relevant phenomena existing in the MSR fuel circuit related to
the FPs. These phenomena include: (i) Production by fission reactions,
(ii) Radioactive decay, (iii) Advection and diffusion of the fluid, (iv)
Migration to bubbles present in the salt, (v) Nuclear reactions
(particularly neutron capture), (vi) Extraction of the bubbles from the
molten salt. Due to the interactions between these different phenomena,
the model will require a multiphysics approach involving the coupled
resolution of the neutronics, thermal‐hydraulics and physical‐chemical
system equations. These equations are solved numerically using a
multiphysics tool that integrates a Computational Fluid Dynamics (CFD)
solver (OpenFOAM) and a Monte Carlo code (Serpent 2). The experimental
work developed at the FEST platform (Fluids Experiments and Simulations
in Temperature) of the LPSC (Grenoble) as part of this PhD will
contribute to evaluate the accuracy of the hydraulics models used in the
work.