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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Book Description
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781730930638
Category :
Languages : en
Pages : 92
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Book Description
Emissive and Langmuir probes were used to measure plasma potential profiles, plasma densities, electron energy distributions, and plasma noise levels near a hollow cathode-based plasma contactor emitting electrons. The effects of electron emission current (100 to 1500 mA) and contactor flowrate (2 to 10 sccm (Xenon)) on these data are examined. Retarding potential analyzer (RPA) measurements showing that high energy ions generally stream from a contactor along with the electrons being emitted are also presented, and a mechanism by which this occurs is postulated. This mechanism, which involves a high rate of ionization induced between electrons and atoms flowing together from the hollow cathode orifice, results in a region of high positive space charge and high positive potential. Langmuir and RPA probe data suggests that both electrons and ions expand spherically from this potential hill region. In addition to experimental observations, a simple one-dimensional model which describes the electron emission process and predicts the phenomena just mentioned is presented and is shown to agree qualitatively with these observations. Experimental results of the first stage of bilateral cooperation with the Italian Institute of Interplanetary Space Physics (IFSI CNR) are presented. Sharp, well-defined double layers were observed downstream of a contactor collecting electrons from an ambient plasma created in the IFSI Facility. The voltage drop across these double layers was observed to increase with the current drawn from the ambient plasma. This observation, which was not as clear in previous IFSI tests conducted at higher neutral pressures, is in agreement with previous experimental observations made at both Colorado State University and NASA Lewis Research Center. Greater double layer voltage drops, multiple double layers, and higher noise levels in the region near the double layers were also observed when a magnetic field was imposed and oriented perpendicular to the li...
Author: National Aeronaut Administration (Nasa)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722693220
Category :
Languages : en
Pages : 80
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The characteristics of double layers observed by researchers investigating magnetospheric phenomena are contrasted to those observed in plasma contacting experiments. Experiments in the electron collection mode of the plasma contacting process were performed and the results confirm a simple model of this process for current levels ranging to 3 A. Experimental results were also obtained in a study of the process of electron emission from a hollow cathode plasma contactor. High energy ions are observed coming from the cathode in addition to the electrons and a phenomenological model that suggests a mechanism by which this could occur is presented. Experimental results showing the effects of the design parameters of the ambient plasma simulator on the plasma potential, electron temperature, electron density and plasma noise levels induced in plasma contacting experiments are presented. A preferred simulator design is selected on the basis of these results. Williams, John D. Unspecified Center...
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 300
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Author:
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ISBN:
Category :
Languages : en
Pages : 94
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Author: John Joseph Blandino
Publisher:
ISBN:
Category :
Languages : en
Pages : 252
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Author: John Steven Snyder
Publisher:
ISBN:
Category : Electric contactors
Languages : en
Pages : 88
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Author: Paul J. Wilbur
Publisher:
ISBN:
Category : Electrodynamics
Languages : en
Pages : 184
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Author: John D. Williams
Publisher:
ISBN:
Category : Cathodes
Languages : en
Pages : 126
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