Initial characterization of the Alternative Low Power Hybrid Ion Engine (ALPHIE) plume

Abstract

This report describes the work performed on the experimental setup and initial characterization of the Alternative Low Power Hybrid Ion Engine (ALPHIE) plume performed at the Universidad Politécnica de Madrid (UPM) Plasma Laboratory. First, a general background of plasma thrusters is presented, followed by a review of relevant plasma parameters and up-to date measuring techniques. The experimental setup is described in detail, with emphasis placed on possible error sources and the effect of the setup on measurement reliability. The general functions of data acquisition and processing software are described, and their focus on automated data analysis is stressed. The first experimental results using this data are presented and discussed; potential trends in the data are compared to existing results for experimental validation. Some unusual results are noted and possible causes assessed, particularly with respect to multiple ion/electron populations and Debye lengths in the plume. Finally, improvements on the experimental process and future steps in characterizing the ALPHIE are proposed.