Abstract

Abstract : Spatial and temporal measurements of the electron density were made using a He-Ne laser. The multiple pass Mach-Zehnder interferometer detects densities above ten to the fifteenth power particles/cubic centimerers. Using these data and free streaming solutions to the Boltzmann equation, which model the expansion of the exhaust, we determine the ion temperature and total charge in the exhaust. The percentage ionization can than be found, and estimates made of the gas dynamic portion of the thrust.

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