Thermal effects and space-charge limited transition in crossed-field devices

A fully kinetic model for the electron flow in a crossed field device is derived and used to determine the system stationary states. It is found that for low injection temperatures, there is a simultaneous presence of distinct stationary solutions and an abrupt transition between accelerating and sp...

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Veröffentlicht in:Physics of plasmas 2014-08, Vol.21 (8)
Hauptverfasser: Marini, Samuel, Rizzato, Felipe B., Pakter, Renato
Format: Artikel
Sprache:eng
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Zusammenfassung:A fully kinetic model for the electron flow in a crossed field device is derived and used to determine the system stationary states. It is found that for low injection temperatures, there is a simultaneous presence of distinct stationary solutions and an abrupt transition between accelerating and space-charge limited regimes. On the other hand, for high injection temperatures, there is only a single stationary solution branch and the change between the regimes becomes continuous. For intermediate temperatures, it is then identified a critical point that separates the abrupt and continuous behaviors. It is also investigated how intrinsic space-charge oscillations may drive stationary states unstable in certain parameter regimes. The results are verified with N-particle self-consistent simulations.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4893313