Abstract
A helicon thruster was developed to research a diagnostic technique for determining plasma parameters using emission spectroscopy and helium line ratios. Conventional plasma diagnostics consisting of conductive components which contact the plasma directly can have measurement errors in the presence of radio frequency, electric, or magnetic fields. A non-invasive diagnostic technique is sought to eliminate these problems. A collisional radiative model is needed to determine the electron density and temperature that result in the measured emission line ratios. This research describes a quasi-steady state collisional radiative model used to determine the electron temperature and density in a helium helicon thruster.
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