An Experimental Investigation of Conducted and Radiated Emissions from a Hollow-cathode Plasma Contactor PDF Download
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Author: Brett W. Buchholtz
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Brett W. Buchholtz
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722938819
Category :
Languages : en
Pages : 102
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An investigation conducted on the electrical interference induced by the operation of a hollow-cathode plasma contractor in a ground-based facility is described. The types of electrical interference, or noise, which are important to Space Station Freedom designers are classified as either conducted or radiated emissions. The procedures required to perform conducted and radiated emission measurements on a plasma contactor are examined. The experimental data obtained are typically examined in the frequency domain (i.e. amplitudes of the noise fluctuations versus frequency). Results presented indicate the conducted emissions, which are the current fluctuations from the contactor into the space station wiring, are affected by operating parameters such as expellant flow rate and discharge current. The radiated emissions, which are the electromagnetic waves induced and emitted by the contactor, appear to be influenced by the contactor emission current. Other experimental results suggest possible sources which are responsible for the observed noise. For example, the influence of the plasma environment downstream from the contactor on noise emission levels is described. In addition, a brief discussion is given on the correlation between conducted and radiated emissions and the mechanisms through which both are influenced by the plasma downstream of the contactor. Buchholtz, Brett W. and Wilbur, Paul J. Unspecified Center CONTACTORS; ELECTROMAGNETIC COMPATIBILITY; ELECTROMAGNETIC INTERFERENCE; GROUND TESTS; PLASMAS (PHYSICS); VACUUM TESTS; ELECTROMAGNETIC RADIATION; EMISSION; NOISE INTENSITY; SPACE STATION FREEDOM...
Author: Brett W. Buchholtz
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Category : Electric contactors
Languages : en
Pages : 104
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Author:
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Category : Aeronautics
Languages : en
Pages : 400
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Author:
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Category : Aeronautics
Languages : en
Pages : 482
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Author:
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Category : Government publications
Languages : en
Pages :
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 898
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Author: National Aeronaut Administration (Nasa)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722693176
Category :
Languages : en
Pages : 74
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A report describing the operating principles of hollow-cathode-based plasma contactors emitting or collecting electrons from an ambient plasma is summarized. Preliminary experiments conducted to determine the noise generated by these plasma contactors in the emission-current return line and in the plasma near it are described. These noise data are measured as current fluctuations in the return line and to the Langmuir probe and then analyzed using a fast Fourier transform technique. The spectral compositions of the data are characterized using power spectral density plots which are examined to identify possible noise source(s) and production mechanism(s). The precautions taken in the construction and calibration of the instrumentation to assure adequate frequency response are described. Experimental results show that line-current noise levels are typically 2 percent of the electron current being emitted or collected. However, noise levels increase to as much as 20 percent of the electron current at a few electron-collection operating conditions. The frequencies associated with most of the noise were harmonics of the 60 Hz input to system power supplies. Plasma noise had characteristics similar in magnitude and frequency to those for the return-line noise, but they contained additional features at frequencies considered to be related to ion-acoustic instabilities. Also discussed is a new probe positioning system built to facilitate future plasma-contractor research. Buchholtz, Brett and Williams, John D. and Wilbur, Paul J. Unspecified Center...
Author:
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Category : Government publications
Languages : en
Pages : 1284
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Author:
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Category : Direct energy conversion
Languages : en
Pages : 200
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