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Completed TRL 3 (started at 2, targeting 3)
I propose to utilize Laser Thomson Scattering (LTS) plasma diagnostics to explore electron dynamics in Hall-effect thrusters. In order to develop the next generation of efficient and long-lifetime Hall thrusters, it is necessary to understand the elusive physics that governs their operation. The goals of increasing thruster performance and mitigating surface erosion are dependent on experimental measurements of electron behavior in the acceleration region of Hall thrusters. These results will inform theories of cross-field transport and enable accurate, first-principles modeling of thrusters. Up to now, there has been limited success with non-invasive diagnostics to measure electron kinetics, due to the relatively low densities of electric propulsion plasmas. However, recent developments in optical technology have enabled greatly enhanced results with LTS diagnostics, suggesting that this tool can be used to characterize electron behavior in Hall thrusters at multiple scales. Non-invasive electron measurements will progress toward the goal of a predictive model of thruster behavior, which will enable faster and less expensive development of these propulsion devices.
Non-invasive electron measurements will progress toward the goal of a predictive model of thruster behavior, which will enable faster and less expensive development of these propulsion devices.
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