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https://www.emploi.cea.fr/Pages/Offre/detailoffre.aspx?idOffre=30897&idOrigine=502&LCID=1036&offerReference=2024-30897
Physique théoriqueCDD Saint Paul lez Durance2024-30897 - Physicist of turbulent transport in stellarator-like configurations M/F<b>Domaine : </b>Physique théorique<br />
<b>Contrat : </b>CDD<br />
<b>Description du poste : </b><br />
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.<br /><br />
The candidate has knowledge and experience in tokamak plasma physics – in particular regarding neoclassical and turbulent transport, gyrokinetic theory and the use of high performance computing numerical codes. Knowledge in stellarator physics is desirable although not mandatory.
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.<br />
<b>Ville : </b> Saint Paul lez Durance<br />
<b>Langue / Niveau : </b><br />
Anglais : Courant<br />
Thu, 04 Apr 2024 14:13:04 Z
https://www.emploi.cea.fr/Pages/Offre/detailoffre.aspx?idOffre=30554&idOrigine=502&LCID=1036&offerReference=2024-30554
Physique théoriqueCDIGif sur Yvette2024-30554 - Junior permanent researcher in computational quantum many-body physics H/F<b>Domaine : </b>Physique théorique<br />
<b>Contrat : </b>CDI<br />
<b>Description du poste : </b><br />
The Institute of Theoretical Physics (IPhT) of the CEA-Saclay, jointly
with the Center for Computational Quantum Physics (CCQ) of the Simons
Foundation’s Flatiron Institute, invites applications for a joint
position in the area of computational quantum condensed matter physics.
The position consists in a full-time CEA permanent position at
IPhT/CEA-Saclay, of which the first three years will be spent on
``détachement" as a full time Associate Research Scientist employed at
the Flatiron Institute's Center for Computational Quantum Physics (CCQ).
More details and applications at
https://academicjobsonline.org/ajo/jobs/25820
<br /><br />
PhD in Physics plus some research experience in at least one of the scientific themes above.
In accordance with CEA's commitment to the integration of disabled people, this job is open to all. CEA offers adjustments and/or organizational possibilities for the inclusion of disabled workers."<br />
<b>Ville : </b>Gif sur Yvette<br />
Wed, 14 Feb 2024 11:08:16 Z
https://www.emploi.cea.fr/Pages/Offre/detailoffre.aspx?idOffre=30553&idOrigine=502&LCID=1036&offerReference=2024-30553
Physique théoriqueCDIGif sur Yvette 2024-30553 - Junior Permanent researcher position in Statistical Physics H/F<b>Domaine : </b>Physique théorique<br />
<b>Contrat : </b>CDI<br />
<b>Description du poste : </b><br />
The Institut de Physique Théorique invites applications for a permanent CEA researcher position in theoretical physics and statistical physics.
Applications of candidates working in the following scientific area will be considered with the highest priority: « Statistical Physics and its applications to biological systems ». Topics of interest include, but are not limited to, statistical physics approaches to neuroscience, genomics, immunology, evolution, ecology, cellular and bacterial growth; AI approaches to biological systems; physics of biomolecules. More details at https://academicjobsonline.org/ajo/jobs/27018
<br /><br />
PhD in Physics plus some research experience in at least one of the scientific themes above.
In accordance with CEA's commitment to the integration of disabled people, this job is open to all. CEA offers adjustments and/or organizational possibilities for the inclusion of disabled workers."<br />
<b>Ville : </b>Gif sur Yvette <br />
Wed, 14 Feb 2024 11:07:42 Z