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POST-DOCTORATE ON 3D MODELLING OF EDGE PLASMA TRANSPORT FOR TOKAMAK DEVICES IN REALISTIC WALL GEOMETRIES


Vacancy details

General information

Organisation

The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.

Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.

The CEA is established in ten centers spread throughout France
  

Reference

2021-15782  

Description de l'unité

CEA-IRFM
L'Institut de Recherche sur la Fusion par confinement magnétique est l'un des départements de la Direction de la Recherche Fondamentale du CEA. Depuis plus de 50 ans, son rôle est de mener des recherches sur une nouvelle source d'énergie : la fusion par confinement magnétique, en associant avec le programme Fusion européen. L'IRFM est installé sur le Centre CEA de Cadarache. Environ 350 salariés y travaillent dont une trentaine de thésards et post-doc ainsi que de nombreux collaborateurs internationaux.
Les activités de l'IRFM sont structurées autour de trois axes de recherches et développement :
• contribuer à la réalisation du projet ITER et ceux de l'Approche Elargie (tokamak JT-60SA principalement)
• préparer l'opération scientifique d'ITER, à travers des activités d'expérimentation et de contrôle, ainsi que de théorie et de modélisation.
• établir les bases du futur réacteur de fusion

Ces activités sont intimement connectées à un effort tout particulier de formation des générations futures de physiciens et technologues de la fusion.
L'IRFM a à sa disposition de nombreuses plateformes de R&D et de tests, dont le tokamak WEST (pour Tungsten (W) Environment Steady-state Tokamak), transformation de Tore Supra en banc de test pour ITER. Le nouveau tokamak du CEA va permettre de tester l'un des composants clés d'ITER et de poursuivre les recherches en physique des plasmas, dans un contexte international grâce aux nombreuses collaborations mises en place.

Position description

Category

Theoretical physics

Contract

Post-doctorat

Job title

POST-DOCTORATE ON 3D MODELLING OF EDGE PLASMA TRANSPORT FOR TOKAMAK DEVICES IN REALISTIC WALL GEOMETRIES

Socio-professional category

Executive

Contract duration (months)

24

Job description

Heat exhaust is one of the challenges on the road to harness fusion power through magnetic confinement. It is a critical issue to be addressed in future ITER experiments. The key to overcome this challenge is to convert a large enough fraction of the plasma internal energy into radiation, thus spreading the energy over a large surface area of the material wall. Injecting well-chosen impurities to increase radiation losses in peripheral regions of the plasma is a very efficient way to spread the energy. At the same time, erosion of first wall and divertor materials will continuously induce impurity generation and intrinsic impurity influxes via the pedestal to the plasma core, affecting plasma performances. The difficulty to get global experimental measurements in tokamak requires complementary numerical simulations in the design of optimized plasma scenarios during the future operation of ITER.

Modelling the impact of such phenomena on edge and SOL plasma transport requires a fully 3D description of both the wall geometry, with for example non-axisymmetric wall elements, in order to have a proper description of the impurity sources, as well as of the magnetic configuration, in order to take into account for example 3D magnetic perturbations.

A one-year postdoctoral position (renewable) is opened at the Institute for Magnetic Fusion Research at CEA Cadarache, in close connection with the research group on numerical modelling at Aix-Marseille University (PIIM and M2P2 labs). The candidate will work on the suite of codes SOLEDGE-EIRENE, which is a state-of-the art numerical platform developed by project partners to simulate plasma transport and turbulence in the edge of tokamaks. The multi-fluid model implemented in Soledge2D has recently been upgraded, with a fully revised implementation of the Zhdanov collisional closure. The work will entail several related code improvements, concerning implementation of a fully 3D description of the wall geometry, convergence acceleration for 3D transport studies, and improvements of the implementation of atomic physics processes for impurities. In addition, the coupling with synthetic diagnostic tools developed at the institute for bolometry and visible spectroscopy measurement will be integrated into the code package. The post-doc will also contribute to run simulations of the radiation patterns in WEST campaigns, and help in determining the impurity content in the machine. This work will thus provide key insights into how to improve performance for future ITER operation.

Applicant Profile

Candidates must have a PhD and a demonstrated knowledge in plasma physics or a related field in physics and/or experiences on numerical modelling

Position localisation

Site

Cadarache

Job location

France, Provence-Côte d'Azur, Bouches du Rhône (13)

Location

Saint Paul lez Durance

Candidate criteria

Languages

English (Fluent)

Recommended training

Physique des plasmas, simulation numérique - Thèse

Requester

Position start date

01/03/2021