Abstract
Aninvestigationaimedatevaluating theperformanceand operationalcharacteristicsoftheSPT-200 wascarried out by Fakel in collaboration with CENTROSPAZIO. The experimental characterization of the thruster was performed bymeasuring itselectrical,propulsive,andoperationalparametersduringa parametrictest.Temperatures of the main thruster components were also measured in order to investigate the thruster thermal behavior. Tests were conducted at Fakel in a vacuum chamber of 17 m 3 volume. The indicated background pressure, measured with ionization gauges calibrated forair, neverexceeded 2.8 £ 10 i 4 torr (uncorrected ). Thethruster was operated overa wide range of power levels, from 2 up to 12 kW. At the nominal operating point of 6 kW, the average specie c impulse and efe ciency, inclusive of all power losses and the cathode e ow, were 1928 s and 0.59, respectively. The maximum efe ciency of 0.63 was obtained at the 11 kW power level and 2950 s specie c impulse.
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