Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PostDocs : selection by topics

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Optimization of hybrid energetic naval propulsion

DPLOIRE (CTReg)

Autre DPLOIRE

01-01-2021

PsD-DRT-21-0006

florian.dupriez-robin@cea.fr

This Postdoc focuses on the development of a methodology and a digital tool for defining, sizing and optimizing hybrid energy chains dedicated to ships. In addition to the energy needs on a dynamic operational profile, it must take into account the constraints inherent in the integration of a propulsion system and the storage of electrical energy and / or associated fuel: availability of power as a function of the sea state, vessel stability, exploitable masses and volumes on board, regulations, supply strategy? A bibliographic analysis will initially allow us to synthesize the needs; criteria and constraints take into account in the tool to optimize the step of defining and sizing the energy chain. This will result in a level of representativeness and a methodology necessary for the modeling of all the components and the simulation of a ship "from the tank to the propeller". The tool should therefore make it possible to integrate advanced energy optimization strategies that go beyond a heuristic approach. Once the problem and the objective function have been formalized, the tool should allow a multi-objective optimization of the architecture and sizing of the energy chain on a set of configurable criteria and constraints: consumption, polluting emissions, maneuverability, storage capacity on board? the methodology are evaluated on two use cases, which will be defined at the start of the project.

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IMPROVING OPTICALLY PUMPED MAGNETOMETERS FOR BIOMEDICAL IMAGING

Département Systèmes (LETI)

Laboratoire Magnétométrie et Tests Electroniques

01-01-2020

PsD-DRT-20-0007

agustin.palacioslaloy@cea.fr

Our lab works on optically pumped magnetometers (OPM) based on helium-4 metastable atoms. Our main achievement in last years has been the design and space qualification of the most advanced OPMs available for spatial exploration, which were launched on ESA Swarm mission [1]. With this very same species we have developed OPMs for medical imaging of brain (MEG) and heart (MCG), which have the advantage of operating at room temperature. The development of these two imaging techniques is an opportunity to better understand and diagnose pathologies like epilepsy, Alzheimer or arrhythmia. A few years ago we performed proof of concept measurements of both MCG and MEG with primitive versions of our sensors [2,3]. After getting a better understanding of our sensors physics [4] and implementing substantial improvements, we are now developing arrays of OPMs and collaborating with several clinical teams in order to test them for different applications and environments. The purpose of this post-doctoral position is to contribute to the development of magnetometer arrays. It involves experimental work to improve the current prototypes of medical OPM arrays: the post-doc will be notably in charge of improving the intrinsic noise of the sensor and identifying the best way to build robust, reproducible architectures that could be replicated in arrays of several hundreds of sensors. This work is aimed at bringing this technology to the medical imaging market, in collaboration with a start-up currently prepared by CEA-Leti. It will be carried out in a multidisciplinary team, composed of researchers, experienced engineers, PhD students and post-docs, specialized in the fields of optics, lasers, magnetism and electronics. It will also rely on collaborations with medical research teams in neurology and cardiology. [1] http://smsc.cnes.fr/SWARM [2] S. Morales et al., [3] E. Labyt et al., IEEE Transactions on Medical Imaging (2019). [4] F. Beato et al. Physical Review A (2018)

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LAB AND FIELD WORK ON OPTICALLY PUMPED MAGNETOMETERS

Département Systèmes (LETI)

Laboratoire Magnétométrie et Tests Electroniques

01-01-2020

PsD-DRT-20-0009

agustin.palacioslaloy@cea.fr

Our lab works on optically pumped magnetometers (OPM) based on helium-4 metastable atoms. Our main achievement in last years has been the design and space qualification of the most advanced OPMs available for spatial exploration, launched on ESA Swarm mission [1]. With this same species we have developed OPMs for medical imaging of brain (MEG) and heart (MCG), which have the advantage of operating at room temperature, with no heating or cooling. The development of these two imaging techniques is an opportunity to better understand and diagnose pathologies like epilepsy, Alzheimer or arrhythmia. A few years ago we performed proof of concept measurements of both MCG and MEG with primitive versions of our sensors [2,3]. After getting a better understanding of our sensors physics [4] and implementing substantial improvements, we are now developing arrays of OPMs and collaborating with several clinical teams in order to test them for different applications and environments. The purpose of this post-doctoral position is to contribute to the development of magnetometer arrays. It involves mainly the deployment of OPM arrays in the clinical environments where they are going to be tested by several of our partner medical research teams in both neurology and cardiology. The post-doc should be able to deploy and operate the sensors in these environments, solve the practical issues, and bring feedback on all kind of improvements that are needed. He or she will also participate in the implementation of some of these improvements, and their tests in lab environment. This work is aimed at bringing this technology to the medical imaging market. It will be carried out in a multidisciplinary team, composed of researchers and experienced engineers. [1] http://smsc.cnes.fr/SWARM [2] S. Morales et al., Phys. Med. B [3] E. Labyt et al., IEEE Transactions on Medical Imaging (2019). [4] F. Beato et al. Physical Review A (2018)

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Postdoctoral fellow in AI, real time signal processing and software for real time epilepsy prediction/forecasting for closed loop neuromodulation by focal Cooling.

Clinatec (LETI)

Clinatec (LETI)

01-03-2021

PsD-DRT-21-0023

napoleon.torres-martinez@cea.fr

To date seizure suppression stimulation technologies (electrical stimulation) are majorly based on seizure detection procedure. No study has provided sound evidence that prospective seizure prediction/forecasting can be used to trigger closed loop therapeutics for drug resistant epilepsy treatment. Our proposal is based on the existing motor brain-computer interface algorithms already in clinical use. They can be adapted to generate prediction/forecasting of seizures occurrence. Our working hypothesis is that treating during high-risk seizures periods and not during the actual seizure would require relatively minor doses of the therapeutical element. This will reduce the power consumption and open the door to fully implantable system. Decoding algorithms will be potentially redesigned to respond better to the epileptic seizures forecasting task. They will be compared to the state of the art CNN based approaches, and other approaches. Prediction/forecasting seizures algorithms will be evaluated in an epilepsy model established at Clinatec, using non-human primates, and the algorithms will be refined over time. Cooling the epileptic foci is an effective way to stop de seizure before generalization. This model allows us to test the efficacy of the algorithms in treating focal seizures. An assessment of hardware embedding design constraints would be conducted to facilitate next steps for the clinical device development. The project will benefit from a collaboration between Clinatec and DSYS/SSCE; and will be in line with upcoming activities of LETI's artificial intelligence platform.

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Optimisation of the Micromegas detector for neutron radiography

Département Métrologie Instrumentation et Information (LIST)

Laboratoire Capteurs et Architectures Electroniques

01-06-2021

PsD-DRT-21-0024

adrien.sari@cea.fr

A postdoctoral position of 12 months of duration is available at CEA Paris-Saclay in the frame of the OMNIS project, which aims at adding new features to a detector based on the Micromegas technology, that is to say: real-time neutron radiography capabilities under high radiation constraints. The postdoctoral researcher will participate to the next developments and optimization of the Micromegas detector for neutron radiography applications. First, the postdoc will work on the characterization, understanding and optimization of the prototype. This study will involve both Monte-Carlo simulation and experimental tests in laboratory in order to estimate the effect of several parameters (gas composition, neutron converter, drift gap, electric field configuration, etc.) and to assess its performances for neutron radiography. In view of enhancing both the spatial resolution and the gamma suppression, evaluation of various camera operation modes will be part of the work done in this project. The results of this work will be the basis for the design of a larger prototype dedicated to neutron radiography applications.

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Hybrid CMOS / spintronic circuits for Ising machines

Département Composants Silicium (LETI)

Laboratoire d'Intégration des Composants pour la Logique

01-01-2021

PsD-DRT-21-0025

louis.hutin@cea.fr

The proposed research project is related to the search for hardware accelerators for solving NP-hard optimization problems. Such problems, for which finding exact solutions in polynomial time is out of reach for deterministic Turing machines, find many applications in diverse fields such as logistic operations, circuit design, medical diagnosis, Smart Grid management etc. One approach in particular is derived from the Ising model, and is based on the evolution (and convergence) of a set of binary states within an artificial neural network (ANN).In order to improve the convergence speed and accuracy, the network elements may benefit from an intrinsic and adjustable source of fluctuations. Recent proof-of-concept work highlights the interest of implementing such neurons with stochastic magnetic tunnel junctions (MTJ). The main goals will be the simulation, dimensioning and fabrication of hybrid CMOS/MTJ elements. The test vehicles will then be characterized in order to validate their functionality. This work will be carried out in the frame of a scientific collaboration between CEA-Leti and Spintec.

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