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Plasma fluctuations in a Kaufman thrusterMeasurements of the RMS magnitude, spectra, and cross correlations for the fluctuations in the beam, discharge, and neutralizer keeper currents are presented for a 30 cm diameter dished grid ion thruster for a range of magnetic baffle currents. The ratio of RMS to mean ion beam current varied from 0.04 to 0.23. The spectra of the amplitudes of the beam and discharge current fluctuations were taken up to 9 MHz and show that the predominant amplitudes occur at frequencies of 10 kHz or below. The falloff with increasing frequency is rapid. Frequencies above 100 kHz the spectral levels are 45 kb or more below the maximum peak amplitudes. The cross correlations revealed the ion beam fluctuations to have large radial and axial scales.
Document ID
19730023883
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Serafini, J. S. (NASA Lewis Research Center Cleveland, OH, United States)
Terdan, F. F. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1973
Subject Category
Propulsion Systems
Report/Patent Number
NASA-TM-X-71421
E-7663
Meeting Information
Meeting: Elec. Propulsion Conf.
Location: Lake Tahoe, NV
Country: United States
Start Date: October 31, 1973
End Date: November 2, 1973
Sponsors: AIAA
Accession Number
73N32616
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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