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Object Kinetic Monte Carlo and Finite Element developments for the creation of a Macroscopic Rate Equation model of fusion reactor walls

di, 03/04/2018 - 09:14

This 2 years 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), the international project that aims to demonstrate the technological and scientific feasibility of fusion energy with the Tokamak design (www.iter.org). The WHeSCI project seeks to describe the interactions of the fusion fuel (deuterium (D) and tritium (T)) and ashes (helium (He) and neutron) 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 further development of the MHIMS and HIIPC Macroscopic Rate Equation (MRE) models [1-4], which are describing so far the D/T fuel trapping in bulk metals, in absence or in presence of bubbles in the micrometre range. In particular, he/she will study and implement synergistic effects between D/T/He implantations and neutron-induced defects in tungsten materials. Object Kinetic Monte Carlo (OKMC) simulations will be used to obtain a dynamical insight onto temporal and thermal evolution of D/T/He and defects in W. Ultimately, OKMC simulations will provide information on bubble nucleation. The input parameters for the OKMC code LAKIMOCA [5] will come from the literature but also from several WHeSCI project partners: atomic-scale events energies and attempt frequencies will come from DFT calculations, spatial distribution of defects and D/T/He species will come from experiments. Once bubble nucleation is understood, its growth will be investigated with Finite Element Methods (FEM) [6]. Based on this numerical approach, D/T/He trapping and bubble growth will be included in the MRE simulations. This work will be done in close collaboration with a PhD student at CNRS/LSPM who is currently developing the Abaqus Finite Element Method (FEM) code as well as a staff of the CEA group working on the MHIMS program.

The candidate should have a PhD in computational physics, a solid background in solid state physics and show skills in the field of metallic materials. At least one experience of OKMC or FEM simulations is required. 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.

The 1st year of the contract will be located in Lille (France) and will focus on OKMC simulations with Charlotte Becquart (CNRS/UMET – University Lille). The 2nd year will be located in Paris and will focus on FEM and MRE implementations with Yann Charles and Jonathan Mougenot (CNRS/LSPM – University Paris 13). Christian Grisolia (CEA/IRFM) will coordinate the simulation work. The postdoctoral contract is financed by the WHeSCI project (coordinated by Régis Bisson, Aix-Marseille University/PIIM).

Application is open until May 31 and the earliest starting date is July 1 2018. Questions should be sent directly to the following contact persons:

Christian Grisolia christian.grisolia AT cea DOT fr
Laboratoire IRFM – CEA Cadarache – 13115 Saint-Paul-lez-Durance

Charlotte Becquart charlotte.becquart AT univ-lille1 DOT fr
Laboratoire UMET- Université Lille 1 – 59655 Villeneuve d’Ascq

Yann Charles yann.charles AT univ-paris13 DOT fr

Jonathan Mougenot jonathan.mougenot AT univ-paris13 DOT fr
Laboratoire LSPM – Université Paris 13 – 93430 Villetaneuse

Régis Bisson regis.bisson AT univ-amu DOT fr
Laboratoire PIIM – Aix-Marseille University – 13013 Marseille


[1] E.A. Hodille et al Nucl. Fusion 57 076019 (2017)

[2] E.A. Hodille et al Phys. Scr. T167 014011 (2016)

[3] C. Sang et al Nucl. Fusion 52 043003 (2012)

[4] C. Quiros et al Nucl. Mat. Ener. 12 1178-1183 (2017)

[5] C.S. Becquart et al. J. Nucl. Mater. 403 75-88 (2010)

[6] Y. Charles et al IJHE 42 20336-350 (2017)

The post Object Kinetic Monte Carlo and Finite Element developments for the creation of a Macroscopic Rate Equation model of fusion reactor walls appeared first on EUROfusion.

The easy JET – European device will move to Berlin

zo, 01/04/2018 - 10:36

(The construction site of the BER International airport in Germany from above. It offers not only a lot of space but also state-of-the-art hotels and restaurants as well as a direct fly-in for JET’s scientists. Picture: Creative Commons)

Sources close to the European Commission Directorate Research, Science and Innovation have finally confirmed what used to be only talk behind closed doors. The Joint European Torus (JET), EUROfusion’s flagship and a pioneer experiment of the European Union, will be transferred to the European mainland.
Representatives of the European Commission, the United Kingdom and the German government agreed in Brussels to move the fusion experiment over to Berlin, right into the heart of Europe.

“JET is the most developed fusion experiment in the world. We saw an urgent need to keep the machine, the knowledge and, above all, our 300 international scientists safe”, says a relieved Lorne Horton, JET’s exploitation manager, shortly after the two hours of intense talks.

JET’s Torus Hall Picture: © Copyright protected by United Kingdom Atomic Energy Authority

Before Queen Elizabeth II and François Mitterrand inaugurated The Joint European Torus as a frontier European experiment in 1984, Germany and the United Kingdom fought fiercely to become the host. But in 1977, to Germany’s disappointment, Culham was chosen.

JET is the only machine in the world able to operate the ‘real’ fusion fuel: a mixture of deuterium and tritium. JET has proven this capability in 1997 when its first Deuterium-Tritium (DT) campaign broke the record for the highest amount of fusion power ever produced.

EUROfusion, the European consortium for fusion research, together with the Culham Center for Fusion Energy (CCFE) had originally planned for a second DT campaign in Culham. The preparations and the installation of new diagnostics had been going for years. Since the new set of DT experiments was scheduled for 2019/2020, representatives of EUROfusion lobbied for a new JET site as Britain is supposed to formally break away from continental Europe in 2019.

The German government which did not succeed to host JET in the first run offered now a suitable area. According to our information, the long-delayed Brandenburg airport will definitely not be finalised. Colleagues close to Engelbert Lütke Daldrup, the Head of the BER airport, heard him saying: “Before we tear the whole compound down, we rather make use of it in order to show our support for the European Union.”

Just like the former Culham airfield, JET will get a large base including brand new runways, hotels and restaurants. In fact, EUROfusion’s scientists, who come from 30 different countries in order to carry out experiments at the European tokamak, will undeniably benefit from the well-developed and, above all, modern infrastructure around its new facilities.

Also, the travel expenses could decrease if EUROfusion decides to collaborate with a new industrial partner. The flight company EasyJET had recently announced to expand in Berlin. It is said that EUROfusion’s Programme Manager Tony Donné is currently discussing an irresistible deal with EasyJET’s Chief executive Johan Lundgren about extra low fares for European fusion scientists with destination Berlin: “The name says it all and we should make use of it”, he adds smilingly.

The post The easy JET – European device will move to Berlin appeared first on EUROfusion.