Specific Charge and Mass Flow Distribution in a Colloid Beam.
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO
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An experimental program established that a multiple needed colloid thruster produces a beam with anisotropic current, specific charge, and mass flow distributions as a function of beam half-angle. Data reduction and analysis indicated that the assumptions of beam isotropy yields valid relative performance but the absolute value of performance determined from the time-of-flight spectrometer is questionable. A segmented time-of-flight collector, consisting of ten electrically isolated rings which could be connected to simulate a total collector, was the primary diagnostic tool. For thrust, specific impulse, and efficiency, results from the segmented and total collector differed by up to 30. Even larger differences were observed in the case of mass flow. By moving the collector, it was found that the distance between the source and time-of-flight collector has a significant effect on specific charge and current. Author
- Electric and Ion Propulsion