Benjamin Jorns
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View article: Mass utilization scaling with propellant type on a magnetically shielded Hall thruster
Mass utilization scaling with propellant type on a magnetically shielded Hall thruster Open
An analytical model for Hall thruster ionization efficiency on multiple propellants is derived and validated with experimental data. The experimental dataset includes previous results from a magnetically shielded Hall thruster operating on…
View article: Hall thruster model improvement by multidisciplinary uncertainty quantification
Hall thruster model improvement by multidisciplinary uncertainty quantification Open
We study the analysis and refinement of a predictive engineering model for enabling rapid prediction of Hall thruster system performance across a range of operating and environmental conditions and epistemic and aleatoric uncertainties. In…
View article: Mode transitions in a magnetically shielded Hall thruster. II. Stability criterion
Mode transitions in a magnetically shielded Hall thruster. II. Stability criterion Open
A stability criterion is derived for mode transitions in the discharge current oscillations of a magnetically shielded Hall thruster. The two-equation model evaluated in Paper I for these large-amplitude (>100% background), low-frequenc…
View article: Mode transitions in a magnetically shielded Hall thruster. I. Experimentally informed model
Mode transitions in a magnetically shielded Hall thruster. I. Experimentally informed model Open
An experimental evaluation is presented of a two-equation model for the low frequency (<25 kHz), large amplitude (>100% of mean) discharge oscillations exhibited by a 9-kW class magnetically shielded Hall thruster. The model is based…
View article: Azimuthal ion dynamics at the inner pole of an axisymmetric Hall thruster
Azimuthal ion dynamics at the inner pole of an axisymmetric Hall thruster Open
The azimuthal dynamics of ions along the inner pole of a Hall thruster with a centrally mounted cathode and a magnetic shielding topography are experimentally investigated. A time-averaged laser-induced fluorescence diagnostic is implement…
View article: Trends in mass utilization of a magnetically shielded Hall thruster operating on xenon and krypton
Trends in mass utilization of a magnetically shielded Hall thruster operating on xenon and krypton Open
The trends in mass utilization with increasing discharge voltage and current are investigated for a magnetically shielded Hall thruster operating on xenon and krypton. A 9 kW class shielded thruster is operated with discharge voltages from…
View article: Multiple frequency electron cyclotron resonance thruster
Multiple frequency electron cyclotron resonance thruster Open
An electron cyclotron resonance (ECR) thruster includes a magnetic field source configured to generate a magnetic field, a thruster body that defines a chamber, the thruster body being disposed relative to the magnetic field source such th…
View article: Laser Measurement of Anomalous Electron Diffusion in a Crossed-Field Plasma
Laser Measurement of Anomalous Electron Diffusion in a Crossed-Field Plasma Open
Non-classical electron diffusion in crossed-field, low-temperature plasmas is measured experimentally. Laser-induced fluorescence and Thomson scattering are used to determine the inverse Hall parameter, a metric for cross-field transport, …
View article: Anomalous cross-field transport in a Hall thruster inferred from direct measurement of instability growth rates
Anomalous cross-field transport in a Hall thruster inferred from direct measurement of instability growth rates Open
The contribution of the electron drift instability to anomalous electron transport is experimentally assessed in a Hall effect discharge. The transport is represented by an anomalous collision frequency, which is related through quasilinea…
View article: Experimental investigation into efficiency loss in rotating magnetic field thrusters
Experimental investigation into efficiency loss in rotating magnetic field thrusters Open
An experimental investigation into the low thrust efficiency of a rotating magnetic field (RMF) thruster is presented. This technology is a low maturity but potentially enabling candidate for high-power in-space propulsion for use with alt…
View article: Inductive probe measurements in a rotating magnetic field thruster
Inductive probe measurements in a rotating magnetic field thruster Open
The induced magnetic field during acceleration in a pulsed rotating magnetic field (RMF) thruster is experimentally investigated. A two-axis Bdot probe is employed to characterize the time-resolved evolution of the fields in a 5 kW-class t…
View article: HallThruster.jl: a Julia package for 1D Hall thrusterdischarge simulation
HallThruster.jl: a Julia package for 1D Hall thrusterdischarge simulation Open
Although the Hall effect thruster is one of the most widely-used forms of in-space electric propulsion, there are aspects of these devices-particularly the electron dynamics-that remain poorly understood.This knowledge gap has precluded th…
View article: Challenges with the self-consistent implementation of closure models for anomalous electron transport in fluid simulations of Hall thrusters
Challenges with the self-consistent implementation of closure models for anomalous electron transport in fluid simulations of Hall thrusters Open
The performance of closure models for the anomalous electron transport when self-consistently implemented in a fluid model for a Hall effect thruster is investigated. This cross-field transport, which is orders of magnitude higher than cla…
View article: Growth and Saturation of the Electron Drift Instability in a Crossed Field Plasma
Growth and Saturation of the Electron Drift Instability in a Crossed Field Plasma Open
The linear growth and nonlinear energy transfer of the electron drift instability (EDI) are experimentally measured in the plume of a low-temperature, Hall effect discharge. A frequency-based bispectral analysis technique applied to fast i…
View article: Physics of electric propulsion
Physics of electric propulsion Open
International audience
View article: Future Directions for Electric Propulsion Research
Future Directions for Electric Propulsion Research Open
The research challenges for electric propulsion technologies are examined in the context of s-curve development cycles. It is shown that the need for research is driven both by the application as well as relative maturity of the technology…
View article: State-of-the-Art and Advancement Paths for Inductive Pulsed Plasma Thrusters
State-of-the-Art and Advancement Paths for Inductive Pulsed Plasma Thrusters Open
An inductive pulsed plasma thruster (IPPT) operates by pulsing high current through an inductor, typically a coil of some type, producing an electromagnetic field that drives current in a plasma, accelerating it to high speed. The IPPT is …
View article: Correction: Data-driven Scaling Law for the Extractor Current of a Capillary Electrospray
Correction: Data-driven Scaling Law for the Extractor Current of a Capillary Electrospray Open
The sixth sentence of the fifth paragraph in section IIIshortly after equation (2)should read as follows: This allows us to write / = / , where Q denotes the volumetric flow rate and the density of the propellant.Equation ( 5), consequentl…
View article: High Power Demonstration of a 100 kW Nested Hall Thruster System
High Power Demonstration of a 100 kW Nested Hall Thruster System Open
The XR-100 team successfully completed high power system testing of a Nested Hall Thruster system made up of the X3 Nested Hall Thruster, a modular Power Processing Unit, and a 5 valve Mass Flow Controller as the culmination of work perfor…
View article: Measurements of ion velocity and wave propagation in a hollow cathode plume
Measurements of ion velocity and wave propagation in a hollow cathode plume Open
The mechanism responsible for the production of energetic ions in the plume of hollow cathodes for electric propulsion is still an open issue. These ions are of concern to cathode and thruster lifetime, particularly for cathodes operating …
View article: Update on the Nested Hall Thruster Subsystem for the NextSTEP XR-100 Program
Update on the Nested Hall Thruster Subsystem for the NextSTEP XR-100 Program Open
Under the NextSTEP program led by Aerojet Rocketdyne in collaboration with NASA Glenn Research Center the University of Michigan, and the Jet Propulsion Laboratory, the XR-100 100 kW Electric Propulsion system is being developed to Technol…
View article: Simple Model for Cathode Coupling Voltage Versus Background Pressure in a Hall Thruster
Simple Model for Cathode Coupling Voltage Versus Background Pressure in a Hall Thruster Open
Peer Reviewed
View article: Passive High-speed Imaging of Ion Acoustic Turbulence in a Hollow Cathode
Passive High-speed Imaging of Ion Acoustic Turbulence in a Hollow Cathode Open
Peer Reviewed