Papers by thibaut voslion
In this paper, we report on progress in understanding the multiscale dynamics of magnetic islands... more In this paper, we report on progress in understanding the multiscale dynamics of magnetic islands in presence of turbulence. We focus numerically on two different kinds of small-scales turbulence, namely, pressure and flow driven turbulences. Experimentally, using TCABR tokamak experimental data, we also show a complex coexistence of turbulent electrostatic and magnetic fluctuations and the effect of edge biasing on the growth of magnetic instabilities.
The dynamics of a global reconnection in the presence of a poloidal shear flow which is located i... more The dynamics of a global reconnection in the presence of a poloidal shear flow which is located in between magnetic islands is investigated. Different linear regimes are identified according to the value of the resistivity and the distance between the low-order resonant surfaces. It is found that the presence of a small shear flow affects and significantly delays the global reconnection processes. It is shown that this delay is linked to a breaking of symmetry imposed by the existence of the shear flow and the generation of a mean poloidal flow in the resistive layers. Comment: 6 pages, 10 figures, APFA/APPTC 2009 Conference
Physics of Plasmas, 2011
ABSTRACT The dynamics of global reconnection in the presence of a poloidal shear flow located in ... more ABSTRACT The dynamics of global reconnection in the presence of a poloidal shear flow located in between magnetic islands is investigated. Different linear and nonlinear regimes are identified depending on the resistivity, the equilibrium velocity amplitude, and the distance between the low-order resonant surfaces. It is found that nonlinearly, the shear flow can significantly delay DTM generation and global reconnection. It is shown that this delay is linked to a symmetry breaking imposed by the shear flow and the generation of mean poloidal flows in the resistive layers. It is also found that turbulence can be generated by Kelvin-Helmholtz instability in between the resonance layers and enhance magnetic reconnection processes.
We investigate the dynamics of a double tearing mode in presence of a shear flow. In fusion devic... more We investigate the dynamics of a double tearing mode in presence of a shear flow. In fusion devices, the double tearing mode can exist whenever the plasma has two rational surfaces. In such reversed magnetic shear plasma situations, internal transport barrier can be observed [1].
Journal of Physics: Conference Series, 2013
ABSTRACT in the framework of scientific outreach at the "Maison des Sciences" o... more ABSTRACT in the framework of scientific outreach at the "Maison des Sciences" of the Aix-Marseilles University, we created a teaching kit for holography contained in a small case. It includes all the required equipment to produce holograms almost anywhere with a simple optical assembly with a very good vibration tolerance. The fundamental principles of holography and several applications are illustrated through simple experiments: reflection Denisyuk holograms, angular multiplexing, notch filters, holographic interferometry and diffraction holographic gratings. It is possible to use this tool for several purposes: science outreach, teaching for undergraduate and graduate students and continuing education. In this article, we explain the basis of holography, how the kit works, and give some applications and results that can be done with it.
European Journal of Physics, 2012
ABSTRACT In the framework of scientific outreach at the Maison des Sciences of Aix-Marseilles Uni... more ABSTRACT In the framework of scientific outreach at the Maison des Sciences of Aix-Marseilles University, we created a teaching kit for holography that can be packed into a small case. It includes all the equipment required to produce holograms almost anywhere and has a simple optical assembly and very good vibration tolerance. The fundamental principles of holography and several applications are illustrated through simple experiments: reflection Denisyuk holograms, angular multiplexing, notch filters, holographic interferometry and diffraction holographic gratings. It is possible to use this tool for several purposes: science outreach, teaching for undergraduate and graduate students and continuing education. In this paper, we explain the basis of holography, how the kit works and indicate some applications and results that can be performed and obtained with it.
In this paper, we report on progress in understanding the multiscale dynamics of magnetic islands... more In this paper, we report on progress in understanding the multiscale dynamics of magnetic islands in presence of turbulence. We focus numerically on two different kinds of small-scales turbulence, namely, pressure and flow driven turbulences. Experimentally, using TCABR tokamak experimental data, we also show a complex coexistence of turbulent electrostatic and magnetic fluctuations and the effect of edge biasing on the growth of magnetic instabilities.
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Papers by thibaut voslion