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Researcher in the Materials, Defects and Irradiation team

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ASSIGNMENT UNIT : IRAMIS / CIMAP - Unit director : Amine CASSIMI

Description of DRF The CEA’s Basic Research Department (DRF, direction de la recherché fondamentale), located in all the CEA’s civilian centers, is responsible for conducting research related to CEA’s missions and in the fields of physics, chemistry and life sciences, fields in which its excellence is recognized worldwide. Description of the unit The CIMAP (Centre de Recherche sur les Ions, les MAtériaux et la Photonique) is a mixed unit (UMR 6252) bringing together the CEA, the CNRS, the ENSICAEN and the Caen Normandy University. Its activity is organized around 3 missions : research, teaching and welcoming interdisciplinary research with GANIL beams. The research activities are interested in the theoretical, experimental and applied aspects of the subjects relating to :
- The ion-matter interaction and the relaxation of excited materials, -The study of defects in materials, -Materials for lasers, photonics and electronics

The MADIR team (Materials, Defects, IRradiation) of CIMAP is very involved in the welcoming mission within the CIRIL platform. The candidate must take part in this mission. In order to ensure quality reception for the various teams coming to use the GANIL beams, the MADIR team is very diverse in its research themes, which includes :
- Fundamental research on the effect of intense electronic excitations in materials (in particular during irradiations with fast heavy ions or with slow multi-charged ions at GANIL). The coupled effects of ballistic collisions and electronic excitations are also studied for materials that are sensitive to them. In addition, the use of ionizing radiation with a lower stopping power allows a better understanding of the mechanisms for the formation of defects thanks to the modulation of the density and heterogeneity of the energy deposit.
- The characterization of the defects induced in various materials (oxides, semiconductors, polymers, ice of astrophysical interest, nuclear materials) and their consequences on the chemical or physical properties of said materials.
- The development of new materials or nanostructuring by irradiation
The MADIR team is looking to strengthen its workforce by recruiting a researcher to strengthen the activities related to the study of structural and microstructural modifications of inorganic materials under irradiation, one of the team’s priority themes in view of recent departures.

JOB DESCRIPTION :
- Field : materials sciences, Ion / matter interaction
- CDI contract
- Job title : Researcher in the Materials, Defects and Irradiation team

The MADIR team has recognized expertise in the study of ion-matter interaction (surface and mass effects, sputtering) as well as in materials science (study of defects, crystallography, physical properties of materials under irradiation ). Through its activity with GANIL beams, the team is also recognized for the instrumental development associated with in-situ analysis of materials.

Researchers in the “structural modifications” group study the fundamental mechanisms of induced modifications in crystalline materials under irradiation, mainly in the field of electronic excitations, ranging from understanding the structure of the track to macroscopic modifications, using as much as possible characterizations allowing in-depth resolution. They thus work on radio-induced phenomena such as phase transitions, amorphization, the creation of point-to-extent defects, atomic diffusion, deformation mechanisms, etc. These studies are carried out on polycrystals as well as single crystals or thin films. In recent years, for example, the most studied materials are sapphire and III-N semiconductors for which a detailed description of the structural changes as a function of depth as well as their link with the energy deposition process has been proposed. These structural and microstructural modifications have an inevitable effect on the macroscopic physical properties (ionic, electrical, thermal or mechanical) and understanding the processes involved in these modifications therefore appears to be a necessity. The contributions of electronic and nuclear stopping powers, or even synergy, which are at the origin of these modifications, are thus studied along the ion path. The techniques used for these studies are X-ray diffraction in grazing incidence or high resolution, scanning electron microscopy, preparation of samples by focused ion beam, transmission electron microscopy (classical imaging, weak- beam, high resolution, STEM HAADF, EELS, EDX), atomic force microscopy, spectrophotometry, Raman or secondary ion spectrometry, etc. Some of these characterizations can be in-situ during GANIL experiments or else ex-situ. The candidate must be involved in the core subjects of the research group and participate in radiation experiments for these subjects or in collaboration when hosting teams benefiting from GANIL beams.

The integration of the candidate will be done in two stages. Initially, he will be integrated into the research topics underway in the group but with great autonomy and responsibility for the subject line that will be assigned to him. He will be led to develop his own research subjects thereafter.

Candidate profile :

The candidate sought will be a doctor with a specialty in materials science or dense environment. He must master at least one of the available characterization techniques (MET, DRX, Raman, etc.). Experience working on a large instrument or accelerator as well as knowledge of radiation phenomena is desirable.

Since CIMAP’s mission is to welcoming interdisciplinary research nearby GANIL ion beams, the new entrant will necessarily be involved in these activities. Good contact, a sense of collective work and involvement in tasks of general interest are therefore essential.

Application :

The file will be made up :
- a CV showing the full course, areas of expertise and list of publications
- a summary in French (or in English) of the thesis and post-doctorate work (3 pages maximum).
- An analysis of the difficulties encountered and the way in which they were understood (and resolved) could be provided,
-a work program within the set framework or an analysis of what the candidate can bring to the theme and how he (she) proposes to strengthen the team.
- thesis reports
- a motivation letter
- two letters of recommendation

Application deadline : April 30th, 2020

Contacts

Isabelle Monnet (monnet@ganil.fr +33 231454670) or Clara Grygiel (grygiel@ganil.fr +33 231454934