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• W3200958051 abstract "The effect of facility background pressure on the operation of a hollow cathode in a Hall thruster-like axial magnetic field is experimentally characterized. Facility pressure was varied between 10 and 88 μTorr-Xe using a secondary flow of xenon into the test facility, and cathode operation was studied using a combination of telemetry and plasma diagnostic measurements. Increasing pressure resulted in decreased discharge voltage, cathode orifice plate temperature, and voltage and current oscillation magnitudes. The plasma diagnostics, which consisted of a radially mounted retarding potential analyzer and an ion saturation probe and emissive probe mounted to a fast reciprocating motion stage, showed that increasing pressure resulted in decreased radial high-energy ions, decreased centerline maximum plasma potential and electron temperature, and increased plasma density farther than 40 mm downstream of the cathode. The effects of background pressure on the cathode plume were largely constrained to between 50 and 100 mm downstream of the cathode, where the largest gradients of plasma potential and electron temperature occur. Experimental measurements were combined with neutral density simulations to identify that the confluence of changes in electron temperature, plasma density, and neutral density result in an increase of almost an order of magnitude in the calculated ionization rate in the same location. These results have implications for both standalone cathode tests and for improving the understanding of facility effects on cathode coupling in Hall thrusters." @default.
• W3200958051 created "2021-09-27" @default.
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• W3200958051 date "2021-09-17" @default.
• W3200958051 modified "2023-09-27" @default.
• W3200958051 title "The effect of facility background pressure on hollow cathode operation" @default.
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• W3200958051 doi "https://doi.org/10.1063/5.0061045" @default.
• W3200958051 hasPublicationYear "2021" @default.
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