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Efficiency Analysis of a High-Specific Impulse Hall ThrusterPerformance and plasma measurements of the high-specific impulse NASA-173Mv2 Hall thruster were analyzed using a phenomenological performance model that accounts for a partially-ionized plasma containing multiply-charged ions. Between discharge voltages of 300 to 900 V, the results showed that although the net decrease of efficiency due to multiply-charged ions was only 1.5 to 3.0 percent, the effects of multiply-charged ions on the ion and electron currents could not be neglected. Between 300 to 900 V, the increase of the discharge current was attributed to the increasing fraction of multiply-charged ions, while the maximum deviation of the electron current from its average value was only +5/-14 percent. These findings revealed how efficient operation at high-specific impulse was enabled through the regulation of the electron current with the applied magnetic field. Between 300 to 900 V, the voltage utilization ranged from 89 to 97 percent, the mass utilization from 86 to 90 percent, and the current utilization from 77 to 81 percent. Therefore, the anode efficiency was largely determined by the current utilization. The electron Hall parameter was nearly constant with voltage, decreasing from an average of 210 at 300 V to an average of 160 between 400 to 900 V. These results confirmed our claim that efficient operation can be achieved only over a limited range of Hall parameters.
Document ID
20040139504
Document Type
Contractor Report (CR)
Authors
Jacobson, David (NASA Glenn Research Center Cleveland, OH, United States)
Hofer, Richard R. (QSS Group, Inc. Cleveland, OH, United States)
Gallimore, Alec D. (Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
September 7, 2013
Publication Date
August 1, 2004
Subject Category
Spacecraft Propulsion and Power
Report/Patent Number
NASA/CR-2004-213212
E-14720
AIAA Paper 2004-3602
Meeting Information
40th Joint Propulsion Conference and Exhibit(Fort Lauderdale, FL)
Funding Number(s)
WBS: WBS 22-319-20-C2
CONTRACT_GRANT: NAS3-00145
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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