Accession Number : AD0754902

Title :   Specific Charge and Mass Flow Distribution in a Colloid Beam.

Descriptive Note : Final rept.,

Corporate Author : AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Turner,Jerrell M.

Report Date : NOV 1972

Pagination or Media Count : 63

Abstract : 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)

Descriptors :   (*ELECTRIC PROPULSION, SCIENTIFIC RESEARCH), (*ION ENGINES, RELIABILITY(ELECTRONICS)), THRUST, SPECIFIC IMPULSE, ELECTRIC FIELDS, COLLOIDS, CHARGED PARTICLES, PARTICLE BEAMS, EXPERIMENTAL DATA, COMPUTER PROGRAMS

Subject Categories : Electric and Ion Propulsion

Distribution Statement : APPROVED FOR PUBLIC RELEASE