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Accueil > Séminaires & Soutenances > Séminaires, soutenances de thèses et HDR précédents > 2018 > Soutenances de thèses et HDR 2018 > Le mardi 9 octobre 2018 à 14h00
Le mardi 9 octobre 2018 à 14h00
Soutenance de thèse de Shaokang Xu.
Lieu : Campus Pierre & marie Curie, 4 place Jussieu
CHANGEMENT DE SALLE : salle de réunion du LPP 24-34 5eme étage
Titre : Study of reduced kinetic models for plasma turbulence
Résumé :
Turbulence and its self regulation mechanisms govern transport in magnetized confinement devices. Kinetic plasma turbulence in the presence of strong magnetic fields, as is present in these devices, is routinely described using the gyrokinetic formulation. Due to the magnetic gradient in Tokamak, the gyrokinetics can be further simplified to bounce averaged gyrokinetics, which is a 4D system to describe the Trapped Ion Mode (TIM) and Trapped Electron Mode (TEM) turbulence in the toroidal plane of the Tokamak. During this thesis, a logarithmically discretized model (LDM) has been derived and applied to the bounce averaged gyrokinetics system. The resulting model is a cheaper implementation of nonlinear multi-scale physics involving trapped electron modes, trapped ion modes and zonal flows, which can handle anisotropy. The kinetic electron/ion and the fully kinetic system have been studied and compared by this model, which may lead to a further understanding of the adiabaticity, the anisotropy and the TIM/TEM nonlinear interactions, etc.
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