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A novel ddPCR™ assay for eDNA detection and quantification of Greater Amberjack Seriola dumerilli and three congeners in US waters: challenges and application to fisheries independent surveys. [PDF]
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Rayleigh Instability in Hall Thrusters
38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2002Gradient-driven Rayleigh-type instabilities in Hall plasma thrusters are analyzed using linearized two-fluid hydrodynamic equations. Necessary instability conditions and a general criterion for stability of azimuthally propagating perturbations are derived.
Andrei A. Litvak, Nathaniel J. Fisch
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Propellant utilization in Hall thrusters
32nd Joint Propulsion Conference and Exhibit, 1996Fuel optimal trajectories for electrically propelled spacecraft require a varying thrust acceleration. To achieve this requirement the electric thruster has to be operated with a variable thrust to power ratio at the maximum available input power. In order to implement this operating mode with a Hall thruster it is necessary to modify both the mass ...
Y. Raitses, J. Ashkenazy, M. Guelman
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Computational model of a Hall thruster
Computer Physics Communications, 2004Correctly modelling the transverse electron mobility is a principle difficulty in computational modelling of Hall thrusters. A 2D hybrid PIC-MCC model is used to test two different electron mobility models. The two models, one based on Bohm diffusion and the other on electron-wall collisions, are applied to two different Hall thrusters (SPT-100 and UM ...
Justin W. Koo, Iain D. Boyd
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34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998
The acceleration of the plasma in the Hall thruster to supersonic velocities is examined by the use of a steady state model. Flows that are smooth across the sonic transition plane are found. The possibility of generating flows in which the acceleration across the sonic plane is abrupt, is also studied.
Fisch, N. J., Fruchtman, A.
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The acceleration of the plasma in the Hall thruster to supersonic velocities is examined by the use of a steady state model. Flows that are smooth across the sonic transition plane are found. The possibility of generating flows in which the acceleration across the sonic plane is abrupt, is also studied.
Fisch, N. J., Fruchtman, A.
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Start‐Up Transient in a Hall Thruster
Contributions to Plasma Physics, 2006AbstractFor the first time a two dimensional axisymmetric fully kinetic Particle‐in‐Cell/Monte Carlo Collision (PICMCC) model is used to describe the start‐up transient of the acceleration channel in a Hall thruster. The Poisson equation and a secondary electron emission model are invoked for the description of the plasma dynamic phase.
F Taccogna +3 more
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37th AIAA Plasmadynamics and Lasers Conference, 2006
The cylindrical Hall thruster, proposed and studied at the PPPL features high ionization efficiency, quiet operation, ion acceleration in a large volume-to-surface ratio channel, and performance comparable with the state-of-the-art Hall thrusters. These characteristics were demonstrated in low and medium power ranges.
Y. Raitses, Artem Smirnov, N. Fisch
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The cylindrical Hall thruster, proposed and studied at the PPPL features high ionization efficiency, quiet operation, ion acceleration in a large volume-to-surface ratio channel, and performance comparable with the state-of-the-art Hall thrusters. These characteristics were demonstrated in low and medium power ranges.
Y. Raitses, Artem Smirnov, N. Fisch
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Kinetic Effects in Hall Thruster Discharge
42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006Recent analytical studies and particle-in-cell simulations suggested that the electron velocity distribution function in E×B discharge of annular geometry Hall thrusters is non-Maxwellian and anisotropic. The average kinetic energy of electron motion in the direction parallel to the thruster channel walls (across the magnetic field) is several times ...
I. D. Kaganovich +3 more
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Analysis of Airbreathing Hall-Effect Thrusters
Journal of Propulsion and Power, 2011The principle idea of using air breathing electrical propulsion for a vehicle flying at orbital speed on the edge of Earth’s atmosphere is examined. In this paper, we present a simple model of a Hall Effect thruster in which the propellant is an ambient air.
Leonid Pekker, Michael Keidar
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Spontaneous oscillations in a Hall thruster
IEEE Transactions on Plasma Science, 1999Low frequency oscillations in a stationary plasma thruster (SPT) have been studied using optical diagnostics and numerical models. The regime of low frequency, large amplitude current oscillations has been especially investigated. The current oscillations are associated with strong oscillations of the light emitted by the plasma in that region. A quasi-
F. Darnon +4 more
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