Journal Article10.1063/1.3564898
The spatiotemporal oscillation characteristics of the dielectric wall sheath in stationary plasma thrusters
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TL;DR: In this article, a two-dimensional particle in cell model is used to simulate the sheath oscillation in stationary plasma thrusters, and the embedded secondary electron emission (SEE) submodel is based on that of Morozov but improved by considering the electron elastic reflection effect.
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Abstract: A two-dimensional particle in cell model is used to simulate the sheath oscillation in stationary plasma thrusters. The embedded secondary electron emission (SEE) submodel is based on that of Morozov but improved by considering the electron elastic reflection effect. The simulation results show that when the SEE coefficient is smaller than one due to the relative low electron temperature, one-dimensional static sheath can be found; as the electron temperature increase, the SEE coefficient approaches to one and temporal oscillation sheath appears; when the electron temperature increases so high that the SEE coefficient is beyond one, the sheath oscillates not only in time but also in space.
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Citations
Negative plasma potential relative to electron-emitting surfaces.
TL;DR: It is found that inverse sheaths form at the walls and ions are confined in the plasma, differs from past particle-in-cell simulation studies of emission which contain an artificial "source sheath" that accelerates ions to the wall, leading to a SCL sheath at high emission intensity.
Influence of emitted electrons transiting between surfaces on plasma-surface interaction
Michael Campanell,Hongyue Wang +1 more
TL;DR: In this article, the authors analyzed the effects of transit on surface interaction and found that the initial energy spread of the emitted electrons, the larger the potential difference, the more negatively the surfaces float.
Effect of anisotropy of electron velocity distribution function on dynamic characteristics of sheath in Hall thrusters
TL;DR: In this paper, a two dimensional particle-in-cell code is used to simulate the effects of Hall thrusters on a collisionless plasma slab, and the simulated results indicate that the sheath changes from steady regime to temporal oscillation regime when the electron velocity distribution function alters from isotropy to anisotropy.
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Near-wall conductivity effect under a space charge-saturated sheath in the Hall thruster ∗
TL;DR: In this article, the influence of the characteristic of a space?charge-saturated sheath near the insulated wall of the Hall thruster on the near-wall conductivity was investigated by the method of 2D+3V.
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A detailed study on the structures of steady-state collisionless kinetic sheath near a dielectric wall with secondary electron emission. I. Classic sheath and its structure transition
Shaowei Qing,Chengyu Wu +1 more
TL;DR: In this article, the classic sheath between a low-temperature plasma source and a dielectric surface that emits secondary electrons is carefully investigated using a 1D3V, steady-state, kinetic sheath model within a broad range of plasma electron temperatures T e.
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References
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Reviews of Plasma Physics
B.B. Kadomtsev
- 30 Oct 2012
TL;DR: In this article, Rozhansky et al. studied the relationship between transverse conductivity and the generation of self-consistent electric fields in strongly ionized magnetized plasma.
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Fundamentals of Stationary Plasma Thruster Theory
A. I. Morozov,V. V. Savelyev +1 more
- 01 Jan 2000
TL;DR: In this article, a review is devoted to very specific processes in stationary plasma propulsion devices with poloidal magnetic and electric fields and a dielectric channel (Fig. 1).
351
Secondary electron emission from dielectric materials of a Hall thruster with segmented electrodes
TL;DR: In this article, the secondary electron discharge parameters in Hall thrusters depend strongly on the yield of secondary electron emission from channel walls and the observed differences might be caused by electron backscattering which is dominant at lower energies and depends strongly on surface properties.
Electron-wall Interaction in Hall Thrusters
TL;DR: In this article, the authors studied the electron-wall interaction effects in Hall thrusters through measurements of the plasma response to variations of the thruster channel width and the discharge voltage.