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Williams, "Determination of Hollow Cathode Plasma Contactor System Requirements using an Electrodynamic Tether System Simulation Tool," 13th International Spacecraft Charging Technology Conference, Pasadena, California, 23-27 June 2014. "Characterization of a hollow cathode styled plasma reactor for photovoltaic applications." Plasma Sources Science and Technology 24, no. Metz, Garrett E., Leonard Mahoney, Nicholas A.

Williams, "A Calcium Aluminate Electride Hollow Cathode," IEEE Transactions on Plasma Science, Vol. Farnell, "Performance evaluation of a 1.5 kW Hall effect thruster with a center mounted heaterless hollow cathode using xenon and krypton propellant," 62nd JANNAF Propulsion Meeting, Nashville, TN, 2015. "Non-Invasive Hall Current Distribution Measurement in a Hall Effect Thruster", 51st AIAA/SAE/ASEE Joint Propulsion Conference, AIAA Propulsion and Energy Forum, ( AIAA 2015-4005) "Recommended Practice for Use of Electrostatic Analyzers in Electric Propulsion Testing". Williams, "Non-invasive Hall current distribution measurement in a Hall effect thruster," Review of Scientific Instruments 88, 013507 (2017) doi: 10.1063/1.4974098 Link Thermoelectric Properties and Morphology of Si/SiC Thin-Film Multilayers Grown by Ion Beam Sputtering.
