Caractérisation et modélisation d'un propulseur plasma à résonance cyclotronique des électrons

Abstract : The purpose of this work is the characterization and theoretical investigation of an electron cyclotron resonance plasma thruster. The objectives is to study the physics of the thruster (energy transfer by cyclotron resonance, ionization process, coupling microwave/plasma and acceleration process) to improve his performances, efficiency and development dimensioning tools. An experimental prototype of the thruster was characterized around the operating freedoms degrees as frequency, magnetic field, the power, the geometry and the gas flow. The results are used to set the conditions for a nominal operation of the thruster in terms of performances and efficiency. It was shown that the position of the resonance area and the operating pressure are the two keys parameters for the optimization of the thruster. This research helped to increase performance and total efficiency of the thruster. For a power of 30 watts and a flow rate of 0.1 mg/s, the thrust provided 1 mN with a specific impulse of 1000 s for 16 % total efficiency. In parallel, a discharge model is adapted to the configuration of the thruster. He estimates the thruster performance, identifies key points and provides sizing prospects for a new version of the thruster. To complete the model, preliminary simulations of electromagnetic wave propagation and microwave plasma coupling magnetized are carried out. The results obtained make it possible to better understand the microwave power deposition in the plasma source and reproduce the influence of the magnetic field observed experimentally.
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Félix Cannat. Caractérisation et modélisation d'un propulseur plasma à résonance cyclotronique des électrons. Physique [physics]. Ecole doctorale de l'Ecole Polytechnique, 2015. Français. ⟨tel-01271986v2⟩

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