This 1 year post-doctoral position is offered in the framework of the collaborative project WHeSCI (piim.univ-amu.fr/amidex/whesci), financed by the A*MIDEX foundation (amidex.univ-amu.fr) and proposed in the context of the International Thermonuclear Experimental Reactor (ITER: www.iter.org). The WHeSCI project seeks to describe the interactions of the fusion fuel (deuterium (D) and tritium (T)) and the fusion products (helium (He) and neutrons) with the walls of the exhaust of the reactor (the divertor made of Tungsten, W). The induced material properties modifications are indeed critical for the reactor operation and safety and the successful operation of ITER requires a detailed understanding of the plasma-wall interactions.
In this context, the post-doctoral fellow will be involved in the experimental study of the effect of damage induced by irradiation in tungsten on the deuterium retention. Irradiation and annealing conditions (incident particle nature, temperature, fluence) will be chosen in order to produce different types of microstructure from the most simple defects to the more complex damage expected in the tokamak due to neutron irradiations. The induced damage will be characterized using complementary techniques such as Positron Annihilation Spectroscopy (PAS) [1-4] and Transmission Electron Microscopy (TEM). The pre-damaged samples will be exposed to low energy deuterium flux at controlled temperature. The evolution of microstructure after deuterium exposure will be evaluated using PAS and then Thermal Desorption Spectroscopy (TDS) will be realized in order to determine trapping energy of deuterium in the different types of defects.
Based on these experimental studies, collaborators of the WHeSCI project will further develop the MHIMS and HIIPC Macroscopic Rate Equation (MRE) models [5-8], which describe the D/T fuel trapping in tungsten, to take into account the presence of neutron-induced defects in tungsten materials and there temperature evolution.
The candidate should have a PhD in material science, a solid background in solid state physics and show skills in the field of metallic materials. In-depth knowledge on the creation of defects (interstitials, vacancies and their complexes...) by irradiation in metals and on their properties (recombination, migration, agglomeration...) is required. Significant experience is expected in characterization of damage in metal in particular with one or more of the following techniques: TEM or PAS. As the candidate will have to interact with the various actors in the project, good oral and written communication skills are necessary and the ability to work in a collaborative research environment is essential. Knowledge of French would be appreciated but is not mandatory. In-house training will be possible in particular on PAS.
The most part of the experiments will be performed in CEMHTI laboratory at Orleans (France) with Marie-France Barthe (CNRS/CEMHTI). They will focus on the preparation of samples, and their microstructure characterizations (using PAS and TEM) before and after irradiations and deuterium exposures. The irradiations will be carried out on the platforms of the EMIR (Study of materials under Irradiation) French infrastructure). The post-doctoral fellow will spend a few weeks in PIIM laboratory located in Marseille (France) for deuterium exposures and TDS experiments. The postdoctoral contract is financed by the WHeSCI project (coordinated by Régis Bisson, Aix-Marseille University/PIIM). Application is open until November 15 and the earliest starting date is December 1 2019. Questions should be sent directly to the following contact persons:
Marie-France Barthe email@example.com
Laboratoire CEMHTI – CNRS - 45071 Orléans
Régis Bisson firstname.lastname@example.org
Laboratoire PIIM – Aix-Marseille University – 13013 Marseille
 P.E. Lhuillier, et al Phys. Status Solidi C 6 (2009) 2329
 P.E. Lhuillier, et al , J. Nucl. Mater. 417 (2011) 504
 P.E. Lhuillier, et al , J. Nucl. Mater. 416 (2011) 13
 L. Pentecoste, et al , Nucl. Instr. Meth. Phys. Res. B 383 (2016) 38
 E.A. Hodille et al Nucl. Fusion 57 076019 (2017)
 E.A. Hodille et al Phys. Scr. T167 014011 (2016)
 C. Sang et al Nucl. Fusion 52 043003 (2012)Läs mer
|Titel||1 year post-doctoral position Deuterium retention in damaged tungsten for fusion reactor walls|
|Job location||Jardin du Pharo 58, bd Charles Livon, 13284 Marseille|
|Publicerad||september 17, 2019|
|Sista ansökningsdatum||november 15, 2019|
|Ämnen||Termodynamik,   Experimentell fysik,   Materialkemi,   Spektroskopi,   Materialfysik,   Kärnfysik,   Plasmafysik,   Solid-state Physics  |