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Anomalous Transport induced by Sheath Instability in Hall Effect Thrusters (Articolo in rivista)

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Anomalous Transport induced by Sheath Instability in Hall Effect Thrusters (Articolo in rivista) (literal)

Anno

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Alternative label

F. Taccogna; S. Longo; M. Capitelli; R. Schneider (2009)
Anomalous Transport induced by Sheath Instability in Hall Effect Thrusters
in Applied physics letters; American Institute Of Physics (AIP), Melville (Stati Uniti d'America)
(literal)

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Istituto di Metodologie Inorganiche e dei Plasmi-CNR, Bari; Dipartimento di Chimica, Università degli Studi di Bari; Max Planck Institute fur Plasmaphysik, Greifswald (literal)

Titolo

Anomalous Transport induced by Sheath Instability in Hall Effect Thrusters (literal)

Abstract

It is well recognized to ascribe the anomalous cross-field conductivity inside Hall-effect thrusters to fluctuation-induced transport due to gradient-driven instabilities (Rayleigh or electron drift) and to electron-wall interaction (near-wall conductivity). In this letter, we have performed numerical experiments showing the possibility of another mechanism inducing azimuthal fluctuations: the lateral sheath instability. It is created by a negative differential resistance of the current-voltage I-V characteristic of the floating wall as a consequence of high secondary electron emission. The contribution from this effect to the anomalous axial current is calculated and it accounts of more than 80% of the experimental value. (literal)

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