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Pushing the physics of edge transport barriers towards the wall: how do boundary conditions impact confinement transitions in tokamaks?

Abstract : We introduce here the main plasma physics principles that will be used in this manuscript. Starting from the single particle motion in an electromagnetic field, we develop until the description of the tokamak principle. A discussion on the radial transport of particle and energy in tokamak discharges is included illustrating the difference between the confined region and the region of plasma-wall interaction. The impact of the plasma shaping on the heat and particle flux deposition widths will then be presented emphasising the need to understand the underlying physics of the widening of these widths in the quest of the power and particle exhaust without wall damaging. In order to situate the starting point of the theoretical development of this thesis which aims at predicting such width, we present the fluid description of the transport in the edge region. Then, the concept of transport barrier establishing at the periphery of the confined plasma is detailed showing the importance of understanding the establishment of the edge region rotation profile. Finally, we will conclude on the context and the motivations of this thesis consisting in the objective of palliating to the lack of knowledge of the impact of the edge plasma conditions on the edge particle transport and rotation profiles behaviour.
Keywords : plasma particle
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Submitted on : Monday, April 11, 2022 - 11:13:43 AM
Last modification on : Tuesday, April 12, 2022 - 3:20:06 AM
Long-term archiving on: : Tuesday, July 12, 2022 - 6:19:20 PM

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Mathieu Peret. Pushing the physics of edge transport barriers towards the wall: how do boundary conditions impact confinement transitions in tokamaks?. Physics [physics]. Institut polytechnique de Paris, 2022. English. ⟨tel-03636830⟩

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