Browsing by Author "Bourdon, Anne"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Interaction of an atmospheric pressure plasma jet with grounded and floating metallic targets: Simulations and experiments
    (Bristol : IOP Publ., 2020) Viegas, Pedro; Hofmans, Marlous; van Rooij, Olivier; Obrusník, Adam; L.M. Klarenaar, Bart; Bonaventura, Zdenek; Guaitella, Olivier; Sobota, Ana; Bourdon, Anne
    The interaction of kHz μs-pulsed atmospheric pressure He jets with metallic targets is studied through simulations and experiments, focusing on the differences between floating and grounded targets. It is shown that the electric potential of the floating target is close to grounded in the instants after the impact of the discharge, but rises to a high voltage, potentially more than half of the applied voltage, at the end of the 1 μs pulse. As a result, a return stroke takes place after the discharge impact with both grounded and floating targets, as a redistribution between the high voltage electrode and the low voltage target. Electric field, electron temperature and electron density in the plasma plume are higher during the pulse with grounded target than with floating target, as gradients of electric potential progressively dissipate in the latter case. Finally, at the fall of the pulse, another electrical redistribution takes place, with higher intensity with the highly-charged floating target than with the grounded target. It is shown that this phenomenon can lead to an increase in electric field, electron temperature and electron density in the plume with floating target.
  • Thumbnail Image
    Item
    Physics of e × B discharges relevant to plasma propulsion and similar technologies
    (Melville, NY : AIP, 2020) Kaganovich, Igor D.; Smolyakov, Andrei; Raitses, Yevgeny; Ahedo, Eduardo; Mikellides, Ioannis G.; Jorns, Benjamin; Taccogna, Francesco; Gueroult, Renaud; Tsikata, Sedina; Bourdon, Anne; Boeuf, Jean-Pierre; Keidar, Michael; Powis, Andrew Tasman; Merino, Mario; Cappelli, Mark; Hara, Kentaro; Carlsson, Johan A.; Fisch, Nathaniel J.; Chabert, Pascal; Schweigert, Irina; Lafleur, Trevor; Matyash, Konstantin; Khrabrov, Alexander V.; Boswell, Rod W.; Fruchtman, Amnon
    This paper provides perspectives on recent progress in understanding the physics of devices in which the external magnetic field is applied perpendicular to the discharge current. This configuration generates a strong electric field that acts to accelerate ions. The many applications of this set up include generation of thrust for spacecraft propulsion and separation of species in plasma mass separation devices. These "E × B"plasmas are subject to plasma-wall interaction effects and to various micro- and macroinstabilities. In many devices we also observe the emergence of anomalous transport. This perspective presents the current understanding of the physics of these phenomena and state-of-the-art computational results, identifies critical questions, and suggests directions for future research.