The theses supported in the RADIAC team since 2005 are given here.  

 

valet  Jason DARDIE

 “Study of the effects of ionizing radiation on electronic materials and systems”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

 Funding: CIFRE TMI-ORION - Defence 2020

 

Abstract:

This work will be separated into four parts. At first, a bibliographic review of the radiative effects will be carried out. The second part is a more experimental work on the radiation resistance of an electronic system developed by TMI-ORION. The results of this part will be discussed in terms of component degradation, component / system level testing and temperature effect. The third part will be the study of the shielding and encapsulation that the studied electronic system knows in order to be able to withstand industrial constraints. Thanks to a GEANT4 simulation tool, we will study the impact of this encapsulation in terms of radiative shielding that it brings. Finally, in a fourth step, we will study the reliability of the complete system.

 

bouisri  Samir BOUISRI

“Development of new integrated sensors based on optically stimulated materials - Application to dosimetry of ionizing radiation”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: Ministry - Defence 2020

 

Abstract:

This project will manufacture and test thin layers of luminescent materials for applications in ionizing dose measurements, more specifically in non-destructive probes of the radiative environment. The range of potential applications of dosimetric measurements using optically stimulated luminescence is the industry of basic nuclear installations dismantling. Research studies focus on the manufacture of luminescent thin films, their modeling and their early characterization, as well as on the key optical property for the intended application ie tests under ionizing beams (X and gamma rays, alpha and beta particles) to highlight the optically stimulated luminescence post irradiation.

 

aguiar  Ygor QUADROS DE AGUIAR

  “Predictive tools and "Radiation Hardening By Design" (RHBD) for SEU and SET in digital circuits”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: H2020 RADSAGA ESR9 - Defence 2020

 

Abstract:

As part of the Marie Curie European project RADSAGA, the RADIAC team will focus on the effects of ionizing radiation on electronic systems in natural and artificial environments. The main objective of this thesis is to develop a complete numerical simulation chain to predict the sensitivity of a given circuit in a given environment (space, ground level, accelerators, etc.). The hardening work will be done by modifying the layout parameters and quantifying the variation of the sensitivity. Circuits such as inverter chains, adders or multipliers will be studied. The results of this thesis work will improve the design capabilities of the circuits. 

 

guagliardo  Salvatore GUAGLIARDO

 “Predictive tools and "Radiation Hardening By Design" (RHBD) - SEL and Temperature Effects”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

 Funding: H2020 RADSAGA ESR10 - Defence 2020

 

Abstract:

As part of the Marie Curie European project RADSAGA, complete modelling and numerical simulation of the phenomenon of Single-Event Latchup (SEL) in CMOS circuits. The full physics-based methodology envisaged in this approach will be based on a multi-scale and multi-physics simulation chain, efficiently coupling the physical and electrical responses of the device subjected to irradiation and taking into account the radiation environment, the complete device architecture, the circuit design, supply voltage and the temperature, which are the most important physical parameters for SEL. A systematic comparison with experimental results will be conducted to fully validate this approach.

 

Rajkowsi  Tomasz RAJKOWSKI

  “System-In-Package (SiP) radiation qualification requirements”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: H2020 RADSAGA ESR12 - Defence 2020

 

Abstract:

The objective of this PhD is to determine an optimal strategy of radiation tests for full System-In-Package (SiP) modules or Individual PCBs with facilities available in the RADSAGA consortium. This study will be performed by obtaining radiation results on two SiP modules which will be entirely developed and manufactured in the frame of this thesis. These SiP modules may profit from some of the dedicated chips developed in other PhD projects within the ITN, such as the SRAM radiation detector of ESR5 which could be integrated in a package with an SEU-counting processor; the time-based signal processing chip of ESR6 which could be integrated with a sensor module or the image sensor of ESR11 which could be integrated with a processor unit. Progress made in this ESR will result in a novel strategy for SiP and PCBs radiation characterization (so far only available at component level) and will be integrated in the guideline document of ESR15.

 

lopes  Israel DA COSTA LOPES

  “Bridging methodology from component to system-level for the assessment of coupled radiation and degradation constraints in digital systems”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: H2020 RADSAGA ESR13 – Defence 2020

 

Abstract:

The objective of this PhD is to study the correlation between component-level and system-level assessments of the radiation constraint on an intermediate-level electronic board representative of avionic and space computing modules. For system integrators, the standard bottom-up approach for SEE assessment can hardly be used with modern digital integrated circuits, thus methods for assessing the robustness of a digital system by performing system-level testing will be investigated for the very first time at the intermediate scale of a computing board representative for avionics and space on-board computing (OBC) systems based on the latest generation of digital ICs. Both long and short-term constraints will be considered by associating accelerated ageing and radiation testing. The error margins associated to the system-level approach will be extrapolated both for atmospheric and space environments and the approach relevancy will be compared to the bottom-up reliability methodologies used so far at the component level. By establishing a bridge between both levels for one of the most complex and critical sub-systems (OBC), this work will pave the way for writing a new industry standard for qualifying the next generation of COTS-based systems exposed to coupled constraints, including those that will be used in large satellite constellations.

  

kimmo  Kimmo NISKANEN

  “Radiation effects on wide bandgap power devices”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: H2020 RADSAGA ESR7 - Defence 2020

 

Abstract:

This PhD aims to investigate both the sensitivity to radiation (mixed field) of silicon and wide band gap power technologies and the impact of radiation-induced degradation on the time to end of functionality of the global system.

 

hoang  Hoang NGUYEN TRAN

  “Modeling and simulation of the phenomenon intermittent stuck bits”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: CNES-TRAD - Defence 2020

 

Abstract:

SEU (Single Event Upset) is defined as a change in logic state due to an energetic particle hitting on a sensitive cell. This phenomenon mainly occurs in electronic devices such as memories, FPGAs or microprocessors. In-flight CNES observations on memory devices have shown specific SEU occurrences on some given addresses: SEU were repetitively detected at a specific address leading to an SEU error rate increasing with time. A previous PhD (2013-2016) was funded by the French Ministry of scientific research and accompanied by a CNES R&D study shared with TRAD Company. In the frame of the PhD, the RADIAC laboratory at Montpellier University has studied this phenomenon, named weakened cell (or intermittent stuck bit - ISB). This work, performed in partnership with TRAD and CNES has shown that it is possible to reproduce ISB at ground level with accelerated particle beams. It has also allowed studying the impact of an irradiation on the data retention time of SDRAM memory points at the same time than a functional test. At the end of this PhD, a physical explanation of the data retention time decrease has been proposed that can explain the ISB phenomenon. The work to be performed in the new PhD consists to assimilate the existing modelling, improve it and implement it in a TCAD simulation code such as ECORCE developed at RADIAC laboratory. This will be done with a view to study qualitatively and quantitatively the given phenomenon. The main objective is to provide a list of the parameters that are mandatory to predict ISB error rates in a given radiative environment.

 

valet

  Catherine MADJIGUENE NGOM

  “Methodology development using X-rays and pulsed laser for the evaluation of radiation effects in advanced semiconductor components”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: IRT Saint-Exupéry – Defence 2021

 

Abstract:

The proposed PhD work aims at developing alternative test methodologies based on the use of specific lasers and X-rays. Indeed, the interaction of an ion, a laser or an X-ray pulse with a semiconductor material can all generate electron-hole pairs, although the physical mechanisms are different. Ions will ionize the material by Coulombian interaction when photons from a laser or an X-ray pulse will interact mostly by photoelectric effect. In both cases, an ionization track is created locally, which can be of comparable spatial and temporal shape. With the emerging use of new materials in power devices technologies (SiC/GaN), focused pulsed X-rays become attractive to study radiation effects in power components. As an example, recent works have shown that laser and X-ray beams can be used to investigate transient effects in GaN-based components. This PhD work will be located in the RADIAC group of the Institute of Electronics and Systems of the University of Montpellier and in the MEA department of the IRT Saint-Exupéry in the FELINE/lot 2 project team. The PhD student will also work with the ESRF/ILL laboratory in Grenoble.

 

valet

  Matteo CECCHETTO

  “Neutron induced SEEs: experimental and simulation study of impact in high-energy accelerator environment and implications on qualification approach”

Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

  Funding: CERN – Defence 2021

 

Abstract:

The study will be aimed at determining the impact of the mixed-field radiation environment present in a high-energy accelerator on the Single Event Effect (SEE) induction of advanced Commercial-Off-The-Shelf (COTS) components typically used in accelerator systems. The focus will be set on the specific impact of thermal and intermediate energy neutrons, starting with their description from a radiation environment perspective, and comparing different locations of the accelerator with other environment such at the atmospheric one, which is due to cosmic rays. The nuclear processes through which neutrons of different energies induce SEEs in micro-electronic components will be modelled with Monte Carlo tools (e.g. FLUKA, MCNP) and integrated in energy deposition models to determine the associated SEE probability. The study will be benchmarked against experimental measurements, and put in the context of the qualification approaches at component and system level used for the high-energy accelerator Equipment.