Time evolution of plasma parameters in the jet of a low-power vacuum arc thruster
Résumé
Vacuum arc thrusters are space electric propulsion systems that operate with a solid propellant. A vacuum arc is triggered in the inter-electrode gap of the thruster, creating a metallic plasma from the vaporization and the ionization of the negative electrode material. Expansion and ejection of this highly ionized plasma at high velocities generates thrust [1]. As the ionization process occurs in a relatively small region and as the plasma is quasi-neutral [2], the vacuum arc thruster (VAT) shows inherent advantages for miniaturization. Unlike Hall Thrusters or Gridded Ion Engines, VATs do not require any external neutralizer. The consumption of a solid propellant through vaporization of the cathode itself suppresses the need of a propellant tank and any gaz feeding system. This gives the ability to reduce the mass and size of the propulsion system. It also increases the reliability of the system, as less components are involved. Moreover, vacuum arc discharges can be pulsed without losses in plasma production
Domaines
Plasmas
Fichier principal
Michaux JEP 2022 Ion Electron parameters PJP VAT.pdf (1.94 Mo)
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