700W功率HET-80霍尔推力器束流特性研究

A serious plasma diagnostic apparatus are designed to get a deep understanding of the working state of a 700 watts power Hall Effect Thruster-80 (HET-80, rated power is 1350W).These plasma diagnostic apparatus include Faraday probe, planar Langmuir probe, Retarding Potential Analyzer (short for RPA) and Emission spectrum.The experimental results show that the half divergence angle of this thruster is 45°, and the whole divergence area is similar to the shape of spindle.The ion current density distribution in the center of the beam presents a typical bimodal structure of the ring-type Hall thruster.Due to the plasma composite collision decreasing the ion content, the integrated current decreases with the increase of the axial distance.Furthermore, the Charge Exchange collision (short for CEX) leads to the electron temperature significantly increased at the edge of the beam region.The central ion energy is close to 247eV, and the acceleration efficiency of the Hall thruster is 79.6% with respect to the discharge voltage of 310V.This acceleration efficiency shows a good performance of the thruster.The results above show that the HET-80 Hall thruster behaves normally at 700W.It was also found that the ion density measured by Faraday probe combined with RPA was more accurate than the results measured by Langmuir probe.Since there is only one hollow cathode in the Hall thruster, emission spectrum shows that the distribution of electron temperature and the relative concentration of ions and atoms near the outlet is non-uniformity distributed.