Joshua L. Rovey
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View article: Comparison of molecular dynamics informed particle-in-cell carbon sputter simulations with ground facility experiments
Comparison of molecular dynamics informed particle-in-cell carbon sputter simulations with ground facility experiments Open
Accurate tracking of sputtered carbon species is crucial in assessing the lifetime of critical components in high-power electric propulsion systems. This study investigates carbon sputtering in high-power electric propulsion (EP) systems t…
View article: Inferring ion cluster lifetimes from energy-resolved mass spectra of an EMI-BF4 electrospray plume
Inferring ion cluster lifetimes from energy-resolved mass spectra of an EMI-BF4 electrospray plume Open
The fragmentation of ion clusters within the accelerating fields of ionic liquid ion sources (ILISs) is well documented and degrades ILIS performance and lifetime. Some of the most popular ILIS liquids, such as EMI-BF4 (1-Ethyl-3-methylimi…
View article: Effect of Assessment Structure on Perceived Efficacy of a Rocketry Course
Effect of Assessment Structure on Perceived Efficacy of a Rocketry Course Open
In recent years, the growing popularity of Massive Open Online Courses (MOOCs) can be attributed to their exceptional accessibility. While MOOCs offer valuable educational opportunities, they also present challenges with regard to instruct…
View article: Indirect optimal control techniques for multimode propulsion mission design
Indirect optimal control techniques for multimode propulsion mission design Open
Multimode spacecraft propulsion has the potential to greatly increase the maneuvering capability of spacecraft in comparison to traditional architectures. This technology combines two or more propulsive modes (e.g., chemical and electric) …
View article: Analysis of the ion collection model in the ExB probe
Analysis of the ion collection model in the ExB probe Open
An ExB probe is a pass-band velocity filter for an ion beam. The ExB probe measurement is related to the ion velocity distribution function (IVDF); however, the finite pass-band filter window size leads to differences in the true IVDF and …
View article: Experience with the Development and Implementation of Online and Hands-on Rocketry Education and Outreach
Experience with the Development and Implementation of Online and Hands-on Rocketry Education and Outreach Open
Space is increasingly becoming globally competitive, and both U.S. civilian and government agencies continue to increase and grow their activities in space. There is also a dearth in the workforce of highly trained and skilled space scient…
View article: Validation and Calibration of a Millimeter Wave Interferometer for Concentration Measurements in Particle-Laden Flows
Validation and Calibration of a Millimeter Wave Interferometer for Concentration Measurements in Particle-Laden Flows Open
View article: Millimeter-Wave Interferometry for Opaque Particle-Laden Flows
Millimeter-Wave Interferometry for Opaque Particle-Laden Flows Open
A novel method to measure the concentration of particles in optically opaque particle-laden flows is presented. This method is based on the principle of millimeter wave interferometry, using a fully-integrated frequency modulated continuou…
View article: A simple retarding-potential time-of-flight mass spectrometer for electrospray propulsion diagnostics
A simple retarding-potential time-of-flight mass spectrometer for electrospray propulsion diagnostics Open
View article: Surface DBD plasma microbubble reactor for degrading methylene blue
Surface DBD plasma microbubble reactor for degrading methylene blue Open
Water contaminants such as endocrine inhibitors, pharmaceuticals, and chlorine treatment by-products are only recently being identified as significant hazards to human health. Since current chlorine treatment does not address many of these…
View article: Erratum: “Ion-induced charge emission from unpolished surfaces bombarded by an [Emim][BF4] electrospray plume” [J. Appl. Phys. 131, 243302 (2022)]
Erratum: “Ion-induced charge emission from unpolished surfaces bombarded by an [Emim][BF4] electrospray plume” [J. Appl. Phys. 131, 243302 (2022)] Open
First Page
View article: Effect of Metal Sequestrants on the Decomposition of Hydroxylammonium Nitrate
Effect of Metal Sequestrants on the Decomposition of Hydroxylammonium Nitrate Open
Hydroxylammonium nitrate (HAN) is an energetic salt used in flight-proven green monopropellants such as ASCENT (formerly AF-M315E), flown in NASA’s 2019 Green Propellant Infusion Mission, and SHP163, flown in JAXA’s Rapid Innovative Satell…
View article: Asymmetric semiconductor nanostructures for particle manipulation
Asymmetric semiconductor nanostructures for particle manipulation Open
We explore how material selection affects the electromagnetic response of closely positioned asymmetric nanostructures. COMSOL Multiphysics is used to model the system, and the materials studied include gold (Au), gallium arsenide (GaAs), …
View article: Review of multimode space propulsion
Review of multimode space propulsion Open
Multimode propulsion is the integration of two or more propulsive modes with shared propellant into a single spacecraft propulsion system. Multimode propulsion is emerging as an enabling technology that promises enhanced capabilities for s…
View article: Impulse and Performance Measurements of Electric Solid Propellant in a Laboratory Electrothermal Ablation-Fed Pulsed Plasma Thruster
Impulse and Performance Measurements of Electric Solid Propellant in a Laboratory Electrothermal Ablation-Fed Pulsed Plasma Thruster Open
Electric solid propellants are advanced solid chemical rocket propellants that can be controlled (ignited, throttled and extinguished) through the application and removal of an electric current. This behavior may enable the propellant to b…
View article: Correction: Experimental Investigation of Mixtures of 1-Ethyl-3-Methylimidazolium Ethyl sulfate and Ethylammonium Nitrate with Electrospray Propulsion Applications
Correction: Experimental Investigation of Mixtures of 1-Ethyl-3-Methylimidazolium Ethyl sulfate and Ethylammonium Nitrate with Electrospray Propulsion Applications Open
View article: Nanoparticle injector for photonic manipulators using dielectrophoresis
Nanoparticle injector for photonic manipulators using dielectrophoresis Open
We describe the concept of a dielectrophoretic nanoparticle injector and its use in a plasmonic/photonic-based nanoparticle manipulation system. Particle motion is achieved by generating an electrostatic, non-uniform field between two tilt…
View article: Design and Operation of a Multiple-Cathode, High-Power, Rectangular Discharge Chamber
Design and Operation of a Multiple-Cathode, High-Power, Rectangular Discharge Chamber Open
A high-power, rectangular discharge chamber is being designed by the University of Michigan for operation with multiple discharge cathode assemblies (DCAs). The multiple cathode approach attempts to increase thruster lifetime by operating …