Physicist of Turbulent Transport in

il y a 2 semaines

Marseille, France CEA Temps plein

Description du poste

**Domaine**:

- Physique théorique

**Contrat**:

- CDD

**Intitulé de l'offre**:

- Physicist of turbulent transport in stellarator-like configurations M/F

**Statut du poste**:

- Cadre

**Durée du contrat (en mois)**:

- 36

**Description de l'offre**:

- The objective of the position is to address turbulent transport issues in non-axisymmetric configurations representative of current stellarators, in view of their better characterization and, ultimately, of their possible optimization. Very few first principle numerical codes can handle such complex geometries within the relevant 5-dimensional gyrokinetic description. The full-f and flux-driven code Gysela was initially developed to study turbulence and transport in the core of tokamak plasmas. Recently, simulations were extended to non-axisymmetric magnetic configurations by accounting for a sinusoidal perturbation of moderate magnitude in the toroidal direction of the magnetic field strength, its vector direction remaining axi-symmetric. The idea is to extend these types of simulations to account for a broad spectrum of magnetic perturbations of larger magnitude reminiscent of stellarators.- In the proposed work, particular emphasis will be given to the two main characteristics of the stellarator project of Renaissance Fusion, namely the large magnetic field strengths permitted by high temperature superconductors and the relatively small aspect ratio geometry. As a side effect of the large B field, such plasmas are also expected to achieve high densities, regimes that should be therefore explored. A staged approach will be adopted for the work plan, so as to build up a comprehensive understanding of the role of the various scanned parameters:
- Experimental scaling laws of the energy confinement time in tokamak plasmas are inconclusive regarding the sign of the exponent of the aspect ratio R/a. Exploring the impact of R/a in axisymmetric configurations would already be instructive.
- Identify a few characteristic spectra of 3D magnetic perturbations that would be reminiscent of current stellarator configurations. Compare their turbulence characteristics and associated transport in various regimes, including simulations with fully adiabatic and hybrid (trapped kinetic) electron response.
- Perform a scan in magnetic field strength B and density N. The resulting transport level could be analyzed in terms of the critical dimensionless parameters rho*~1/B and nu*~N and compared to the international stellarator scaling law ISS04.- She/he is able to work in collaboration with several researchers of different expertise, including other physicists, applied mathematicians, numerical developers and experts in parallelization.In line with CEA's commitment to the integration of disabled people, this position is open to all. The CEA offers accommodation and/or organizational possibilities for the integration of disabled workers.Localisation du poste

**Site**:

- Cadarache

**Localisation du poste**:

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

**Ville**:

- Saint Paul lez Durance

**Langues**:

- Anglais (Courant)

**Formation recommandée**:

- Doctorat en physique

Demandeur

**Disponibilité du poste**:

- 01/05/2024

Informations générales

**Entité de rattachement**:
Le CEA est un acteur majeur de la recherche, au service des citoyens, de l'économie et de l'Etat.
- Il apporte des solutions concrètes à leurs besoins dans quatre domaines principaux : transition énergétique, transition numérique, technologies pour la médecine du futur, défense et sécurité sur un socle de recherche fondamentale. Le CEA s'engage depuis plus de 75 ans au service de la souveraineté scientifique, technologique et industrielle de la France et de l'Europe pour un présent et un avenir mieux maîtrisés et plus sûrs.
- Implanté au cœur des territoires équipés de très grandes infrastructures de recherche, le CEA dispose d'un large éventail de partenaires académiques et industriels en France, en Europe et à l'international.
- Les 20 000 collaboratrices et collaborateurs du CEA partagent trois valeurs fondamentales:
- La conscience des responsabilités
- La coopération
- La curiosité

**Référence **:2024-30897**Description de l'unité**:

- Le CEA est au cœur des enjeux sociétaux et en particulier de la transition énergétique. Dans ce domaine, des recherches de pointe sont menées au sein de l'Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), dont l'objectif est le développement d'une source d'énergie durable et respectueuse de l'environnement basée sur l'utilisation de l'énergie de fusion à l'œuvre dans les étoiles.
- La production de cette énergie sur Terre demande de porter à plusieurs centaines de millions de degrés un milieu appelé plasma au sein d'installations de hautes technologies, comme les tokamaks. Ce défi, aux riches perspectives industrielles et économiques, exige d'import

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