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Impact of 3D non axisymmetrical magnetic perturbations on the transport and turbulence in the edge plasma of tokamaks

Abstract : For an energy mix, the mastery of nuclear fusion offers the opportunity for a abundant and renewable source of energy. The tokamaks showed the best performance for confining a fusion plasma using magnetic fields and were chosen as the next generation of machines for research in fusion (ITER). The evacuation of heat flows and the increase in the time of containment are the two main challenges for tokamaks. They are directly in connection with the perpendicular, essentially turbulent transport towards the wall. For improve confinement, mode H is sought. It creates a pedestal on the pressure in the edge plasma, reducing the perpendicular transport but is associated with relaxations, the ELMs, responsible for a transitory influx of heat on the walls beyond tolerable limits. To remove or mitigate ELMs, disturbances 3D Magnetics (MPs) have been added through external coils. The impacts MPs on the ELMs, the L-H transition, their screening or their resonance on the magnetic field have been studied. Few data exist on their impact on the turbulence due to the difficulty of experimental measurements and the complexity of the tools numbers needed. In this thesis, we address the issue by modeling the edge plasma, from the outside of the core to the SOL. 2 complementary codes are used: a fluid code Turbulent electrostatic 3D, TOKAM3X and a medium field, SOLEDGE3X_HDG.
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Submitted on : Monday, April 11, 2022 - 11:52:05 AM
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Benjamin Luce. Impact of 3D non axisymmetrical magnetic perturbations on the transport and turbulence in the edge plasma of tokamaks. Physics [physics]. Aix Marseille University, 2022. English. ⟨tel-03636910⟩

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