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Daniel Guggenheim School of Aerospace Engineering

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search.filters.applied.f.advisor: Walker, Mitchell L. R. × Author: Suazo Betancourt, Jean Luis × Item Type: Publication × search.filters.applied.f.isSeriesOfPublicationTitle: Doctor of Philosophy with a Major in Aerospace Engineering × Type: Dissertation ×

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Laser Thomson Scattering Measurements of the Plasma Structure in the Front Pole Region of a Magnetically-shielded Hall Effect Thruster

2024-04-27 , Suazo Betancourt, Jean Luis

Laser Thomson scattering (LTS) is a diagnostic that provides direct access to electron properties in a plasma. This diagnostic is calibrted via laser Raman scattering (LRS). The goal of this thesis was to probe the electron properties in the near field plasma plume of a magnetically shielded (MS) Hall effect thruster (HET), a type of electrostatic electric propulsion device (EP), to provide insight into the applicability of the isothermal magnetic field line model and a notional description of the electron-property-predicted plasma structure traversing the front pole region from the discharge to cathode centerline. To this end, this thesis provides the following contributions: 1. Implementation of a Bayesian analysis and model selection framework for LRS-calibrated LTS diagnostics. 2. Detailed design and implementation of a discharge plasma cell and LTS system for near plasma boundary and laser plasma and laser neutral interactions. 3. Detailed design and implementation of a large vacuum test facility LTS system for measurements in live EP devices benchmarked on a hollow cathode. 4. Detailed upgrade to the large vacuum test facility LTS system for measurements in the near field discharge of a high current density MS HET. Specifically, axially resolved electron property measurements along the discharge channel centerline, spatially resolved method traversing the front pole region from the channel centerline to the cathode centerline, and measurements along two distinct magnetic field lines.

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