Flow dynamics and magnetic induction in the von-Karman plasma experimentReport as inadecuate




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1 Phys-ENS - Laboratoire de Physique de l-ENS Lyon 2 LMFA - Laboratoire de Mecanique des Fluides et d-Acoustique 3 LEGI - Laboratoire des écoulements géophysiques et industriels 4 Ecole Polytechnique

Abstract : The von-Karman plasma experiment is a novel versatile experimental device designed to explore the dynamics of basic magnetic induction processes and the dynamics of flows driven in weakly magnetized plasmas. A high-density plasma column 10^16 - 10^19 particles.m^-3 is created by two radio-frequency plasma sources located at each end of a 1 m long linear device. Flows are driven through JxB azimuthal torques created from independently controlled emissive cathodes. The device has been designed such that magnetic induction processes and turbulent plasma dynamics can be studied from a variety of time-averaged axisymmetric flows in a cylinder. MHD simulations implementing volume-penalization support the experimental development to design the most efficient flow-driving schemes and understand the flow dynamics. Preliminary experimental results show that a rotating motion of up to nearly 1 km-s is controlled by the JxB azimuthal torque.





Author: Nicolas Plihon - Guillaume Bousselin - Francesco Palermo - Jorge A. Morales - Wouter Bos - Fabien S. Godeferd - Mickaël Bourgoin

Source: https://hal.archives-ouvertes.fr/



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