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A paper by the low-temperature plasma team selected for the cover page of the journal “Physics of Plasmas“
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Understanding anomalous electron transport in low-temperature magnetized plasmas as those encountered in Hall-effect thrusters for electric propulsion remains a key challenge in the development of self-consistent models of these systems. It has been shown that short-wavelength, high-frequency, instabilities in the azimuthal EXB direction may be responsible for increased electron transport due to an enhanced electron-ion friction force. In this paper, we rigorously assess a recently developed theoretical model for the friction force by comparing it with the friction force self consistently obtained from 2D axial-azimuthal particle-in-cell simulations. Overall the theory is found to be in very good agreement with the simulation results for all cases studied; verifying the underlying physical mechanisms leading to enhanced electron transport. Finally, we discuss significant challenges to fully develop a self-consistent, first principles, model of anomalous transport in fluid simulations.
These fundamental studies belong to the doctoral works of Thomas Charoy, who is supervised by Anne Bourdon and Pascal Chabert and registered at the doctoral school IP Paris. These results were derived in the frame of the project POSEIDON, financially supported by the Agence Nationale de la Recherche under the reference ANR-16-CHIN-0003-01 and Safran Aircraft Engines. The theoretical model used in this work was initially derived by Trevor Lafleur during his post-doctoral stay financially supported by CNES at LPP and further developed since then. PIC simulations have been carried out thanks to the HPC resources of CINES (under the allocation A0060510439 et A0040510092 made by GENCI) and of CERFACS at Toulouse.
These original results were selected by the Physics of Plasmas journal for the cover of the June 2020 issue.
View online : https://aip.scitation.org/doi/10.10...
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