DIAGNOSTICS OF LOW-SPACIFIC-CHARGE COLLOID ION BEAM
Technical rept. Jun 1967-Jun 1969
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
As part of an in-house colloid diagnostic program, the first detailed mapping of propellant mass flow distribution from a colloid source was completed, and the program has shown the influence of anisotropic or non-uniform flow conditions within the beam on the efficiency of source operation. The operating conditions of high propellant feed pressure, low voltage, and high resistivity of the sodium iodideglycerol propellant, which created a very low specific charge beam, caused a nonuniform distribution of specific charge and beam current as function of beam divergence half angle. The assumption of uniform beam conditions would result in a 12 error in computing thrust and a 25 error in determining overall efficiency.
- Electric and Ion Propulsion