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

PostDocs : selection by topics

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IMPROVING OPTICALLY PUMPED MAGNETOMETERS FOR BIOMEDICAL IMAGING

Département Systèmes (LETI)

Laboratoire Capteurs Haute Performance

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 Capteurs Haute Performance

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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Low-Temperature Analog Integrated Design for Readout Spin-based Qubits

Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Intégration Gestion d'Energie Capteurs et Actionneurs

PsD-DRT-20-0011

gael.pillonnet@cea.fr

Currently, the research on quantum computing attracts great attention in order to favor upscaling of the number of qubits for superior calculation capacity. The mature CMOS technology for transistor circuits offers the opportunity to develop on-chip integration of CMOS qubits with classical electronics at low-temperatures thereby improving qubit manipulation and read out with respect to room-temperature apparatus. Our team have already proved the elementary operations of analog- and digital-circuits in an industrial 28nm CMOS technology at low temperatures which paves the way to more complex architecture to address qubits matrix. The post-doctoral position concentrates on design and experimental investigations of integrated circuits for the frequency-multiplexed Spin-based qubit readout down to 100 mK in order to address the performance at low temperatures and the physical understanding with respect to available bandwidth, local heating, electrical noise.

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Compressed Sensing Electron Tomography: Quantitative Multi-dimensional Characterization of Nanomaterials

Département des Plateformes Technologiques (LETI)

Autre laboratoire

01-01-2019

PsD-DRT-19-0015

zineb.saghi@cea.fr

Electron tomography (ET) is a well-established technique for the 3D morphological characterization at the nanoscale. ET applied to spectroscopic modes for 3D structural and chemical analysis has become a hot topic but necessitates long exposure times and high beam currents. In this project, we will explore advanced compressed sensing (CS) approaches in order to improve the resolution of spectroscopic ET and reduce significantly the dose. More precisely, we will focus on the following two tasks: 1. Comparison of total variation minimization, orthogonal or undecimated wavelets, 3D curvelets or ridgelets and shearlets for nano-objects with different structures/textures; 2. Comparison of PCA and novel CS-inspired methods such as sparse PCA for dimensionality reduction and spectral un-mixing. The code will be written in Python, using Hyperspy (hyperspy.org) and PySAP (https://github.com/CEA-COSMIC/pysap) libraries. The project follows a multidisciplinary approach that involves the strong expertise of the coordinator in ET and the input of two collaborators with complementary skills: Philippe Ciuciu with expertise in MRI (DRF/Joliot/NEUROSPIN/Parietal) and Jean-Luc Starck with expertise in cosmology, signal processing and applied maths (DRF/IRFU/DAP/CosmoStat). The three communities share a strong interest in compressed sensing algorithms.

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Design Optimization of a District Heating System

Département Thermique Biomasse et Hydrogène (LITEN)

Laboratoire des Systèmes Energétiques et Démonstrateurs Territoriaux

01-01-2020

PsD-DRT-20-0017

roland.baviere@cea.fr

As part of mitigation measures to limit global warming, district heating and cooling systems are currently progressing in France. Public authorities and an ambitious target of increasing, by a factor of five, the amount of renewable and recovery energy distributed by these systems by 2030 promote this evolution. In this context, there is a tremendous interest in designing algorithms and software to improve the assessment, the definition and the operation of these systems. Specifically, we are interested in the design optimization of new district heating systems. In this context, the combination of heuristic optimization and simulation seems a relevant approach. The aim of this post-doct position is to propose and asses a design optimization strategy for district heating systems. The strategy will integrate the possibility to optimize the distribution network, the location of the supply units and the size of various equipment (e.g. tube diameter ?). The envisioned optimization approach could be based on a metaheuristic coupled to a digital twin of the system available in our lab.

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PACKAGED ELECTRONIC ADDITIVE MANUFACTURING (PEAM)

DLORR (CTReg)

Autre DLORR

01-03-2019

PsD-DRT-20-0019

manuel.fendler@cea.fr

The purpose of the PEAM Post-Doctoral Study is to leverage the benefits of additive manufacturing for the packaging and integration of electronic functions in harsh environments. The targeted applications are intelligent tools for more performance, more quality control, and smart parts for added value, especially in terms of maintenance. The topological optimization of objects designed by additive manufacturing makes it possible to position the electronic functions in the best place within the framework of a real mechanical and electronic co-design, in order to ensure the measurement function as close as possible to the centers of interest (integration), and in the best conditions of protection (packaging). The project must allow us to select the technologies capable of adding electronic functions by adding material for the elements of routing and interconnections, as well as resistive sensors and passive components (on passivated substrates or dielectric supports), then encapsulate these elements without degradation of its reliability.

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