Download or read book Modeling the Effect of Plasma wall Interaction in a Hall Thruster written by Subrata Roy and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Model of Plasma wall Interaction Effects in a Hall Thruster written by E. Ahedo and published by . This book was released on 2001 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Model of Radial Plasma wall Interactions in a Hall Thruster Discharge written by E. Ahedo and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Electric Propulsion written by Dan M. Goebel and published by John Wiley & Sons. This book was released on 2008-12-22 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout most of the twentieth century, electric propulsion was considered the technology of the future. Now, the future has arrived. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. The authors provide an introduction to plasma physics in order to allow readers to understand the models and derivations used in determining electric thruster performance. They then go on to present detailed explanations of: Thruster principles Ion thruster plasma generators and accelerator grids Hollow cathodes Hall thrusters Ion and Hall thruster plumes Flight ion and Hall thrusters Based largely on research and development performed at the Jet Propulsion Laboratory (JPL) and complemented with scores of tables, figures, homework problems, and references, Fundamentals of Electric Propulsion: Ion and Hall Thrusters is an indispensable textbook for advanced undergraduate and graduate students who are preparing to enter the aerospace industry. It also serves as an equally valuable resource for professional engineers already at work in the field.
Download or read book Plasma Simulations by Example written by Lubos Brieda and published by CRC Press. This book was released on 2019-12-13 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of plasmas is crucial in improving our understanding of the universe, and they are being increasingly utilised in key technologies such as spacecraft thrusters, plasma medicine, and fusion energy. Providing readers with an easy to follow set of examples that clearly illustrate how simulation codes are written, this book guides readers through how to develop C++ computer codes for simulating plasmas primarily with the kinetic Particle in Cell (PIC) method. This text will be invaluable to advanced undergraduates and graduate students in physics and engineering looking to learn how to put the theory to the test. Features: Provides a step-by-step introduction to plasma simulations with easy to follow examples Discusses the electrostatic and electromagnetic Particle in Cell (PIC) method on structured and unstructured meshes, magnetohydrodynamics (MHD), and Vlasov solvers Covered topics include Direct Simulation Monte Carlo (DSMC) collisions, surface interactions, axisymmetry, and parallelization strategies. Lubos Brieda has over 15 years of experience developing plasma and gas simulation codes for electric propulsion, contamination transport, and plasma-surface interactions. As part of his master’s research work, he developed a 3D ES-PIC electric propulsion plume code, Draco, which is to this date utilized by government labs and private aerospace firms to study plasma thruster plumes. His Ph.D, obtained in 2012 from George Washington University, USA, focused on a multi-scale model for Hall thrusters utilizing fluid-kinetic hybrid PIC codes. He has since then been involved in numerous projects involving development and the use of plasma simulation tools. Since 2014 he has been teaching online courses on plasma simulations through his website: particleincell.com.
Download or read book One Dimensional Analysis of Hall Thruster Operating Modes written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The very simplicity of the Hall thruster structure with no screens or other control surfaces makes it difficult to understand the interrelationships which, in the end, localize and shape the various plasma regions existing in the accelerating channel. Since the radial magnetic field is usually shaped with a peak near the channel exit, the plasma structure has often been explained as simply a reflection of the magnetic field distribution. However, this is inadequate to explain the plasma dynamics inside the accelerating channel. We develop a macroscopic model gathering reliability and clarity. Quantitative accuracy in the predictions is not the main goal. Instead, emphasis is given to the consistency of the governing equations and their boundary conditions, and to include enough basic physics to illuminate the complex interplay of phenomena which shape the Hall thruster plasma. A basic model is presented along with a supplementary model of the radial interaction of the plasma with the lateral walls of the thruster. An analysis is presented of the effects of the radial plasma/wall interactions on the basic steady-state solution. The effects of heat conduction and plasma oscillations are discussed.
Download or read book Development of a Computationally Efficient High Fidelity Finite Element Based Hall Thruster Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the development of a two dimensional finite element based numerical model for efficient characterization of the Hall thruster plasma dynamics in the framework of multi-fluid model. Effect of the ionization and the recombination has been included in the present model. Based on the experimental data, a third order polynomial in electron temperature is used to calculate the ionization rate. The neutral dynamics is included only through the neutral continuity equation in the presence of a uniform neutral flow. The electrons are modeled as magnetized and hot, whereas ions are assumed magnetized and cold. The dynamics of Hall thruster is also investigated in the presence of plasma-wall interaction. The plasma-wall interaction is a function of wall potential, which in turn is determined by the secondary electron emission and sputtering yield. The effect of secondary electron emission and sputter yield has been considered simultaneously, Simulation results are interpreted in the light of experimental observations and available numerical solutions in the literature. Jacobson, David (Technical Monitor) and Roy, Subrata Glenn Research Center
Download or read book A Hall Thruster Performance Model Incorporating the Effects of a Multiply Charged Plasma written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-03 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Hall thruster performance model that predicts anode specific impulse, anode efficiency, and thrust is discussed. The model is derived as a function of a voltage loss parameter, an electron loss parameter, and the charge state of the plasma. Experimental data from SPT and TAL type thrusters up to discharge powers of 21.6 kW are used to determine the best fit for model parameters. General values for the model parameters are found, applicable to high power thrusters and irrespective of thruster type. Performance of a 50 kW thruster is calculated for an anode specific impulse of 2500 seconds or a discharge current of 100 A. Hofer, Richard R. and Jankovsky, Robert S. Glenn Research Center NASA/TM-2002-211214, E-13066, NAS 1.15:211214, AIAA Paper 2001-3322
Download or read book A Hall Thruster Performance Model Incorporating the Effects of a Multiply Charged Plasma written by Richard R. Hofer and published by . This book was released on 2002 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of the Plasma Response in a Hall Thruster written by and published by . This book was released on 2002 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report investigates I dimensional and 2 dimensional hall effect thruster models to better understand the following physics related issues: radial structure of the plasma, lateral wall effects, physics of the subsonic region, no near-total ionization regimes, effects of secondary electron emission from the walls, and reduction of the growth rate of self oscillations.
Download or read book Breathing Mode Effects on Hall Thruster Plasma Quantities and Channel Wall Power Loss written by Nadiah Jenkins and published by . This book was released on 2019 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Breathing mode instabilities, axially-oriented waves between 5-40 kHz, have been observed in Hall thruster operation since the earliest days of experimental research, including their ability to grow large enough to extinguish the working plasma. Recent forays into higher power Hall thrusters and extended mission durations highlight the need to understand the mechanisms and consequences of the breathing mode. While experiments in the last 20 years have increased the understanding of the time dependent behavior of plasma within the channel, analytical and numerical models have struggled to accurately replicate the oscillation or predict its effects. This thesis presents a partial-D fluid model to numerically solve for plasma and neutral density, ion and electron velocity, and mass utilization in a radially- and azimuthally-symmetric SPT-type Hall thruster. After an ideal steady state solution converges, these quantities evolve in the presence of a driven sinusoidal oscillation of the electric field, which simulates a breathing mode oscillation. Separate simulations vary the frequency and amplitude of the driven oscillations to test spatial and temporal variations of the acceleration region. Then, analysis focuses on how the oscillations affect plasma quantities and key contributors to channel wall power loss. This work provides clarification on how the breathing mode perturbs the plasma and how this compares with experiments in the literature.
Download or read book Two Dimensional Modelling of the Hall Thruster Discharge Final Report written by and published by . This book was released on 2007 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model of the plasma interaction with the dielectric walls of a Hall thruster has been presented. It accounts for partial thermalization of the electron population through a single parameter 3/4 and includes a two-population, four-parameter model for SEE. Analytical expressions are obtained for the main parameters characterizing that interaction, such as the particle and energy fluxes to the walls and sheaths, which are needed as boundary conditions of quasineutral models of the full discharge. The behavior for low thermalization is shown to differ greatly from the commonly-used, high-thermalization case. This is very relevant for Hall thrusters, where there is a growing conviction that electron thermalization is low. At low thermalization, energy losses are close to its minimum, the charge saturation limit is not attainable, and the sheath potential is small; the different roles of beam and primary electrons on these characteristics have been analyzed. Significant decreases of the parallel temperature of primary electrons and, therefore, of the plasma flux into the sheath take place only at the very-low thermalization limit. The investigation of the emission model for secondary electrons has shown that the presence of a relevant fraction of elastically reflected electrons affects greatly the response. They tend to amplify the relative densities of untrapped electrons; their effect on the net primary and beam fluxes comes out from the zero electrical current balance. It is reiteratively found that the role of the sheath potential fall is to adjust the primary electron flux to wall and not vice versa. Although most of the analysis is carried out for an energy-independent yield of reflected electrons, a temperature-dependent yield expression is proposed, which avoids integrals expressions at the same time that it recovers approximately the reduction of that yield with the impact energy.
Download or read book Electron Wall Interaction in Hall Thrusters written by Y. Raitses and published by . This book was released on 2005 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hybrid Particle in cell Modeling and Electrostatic Probe Survey of Hall Thrusters written by John Michael Fife and published by . This book was released on 1998 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Electric Propulsion written by Dan M. Goebel and published by John Wiley & Sons. This book was released on 2023-10-25 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Electric Propulsion Understand the fundamental basis of spaceflight with this cutting-edge guide As spacecraft engineering continues to advance, so too do the propulsion methods by which human beings can seek out the stars. Ion thrusters and Hall thrusters have been the subject of considerable innovation in recent years, and spacecraft propulsion has never been more efficient. For professionals within and adjacent to spacecraft engineering, this is critical knowledge that can alter the future of space flight. Fundamentals of Electric Propulsion offers a thorough grounding in electric propulsion for spacecraft, particularly the features and mechanisms underlying Ion and Hall thrusters. Updated in the light of rapidly expanding knowledge, the second edition of this essential guide detailed coverage of thruster principles, plasma physics, and more. It reflects the historic output of the legendary Jet Propulsion Laboratory and promises to continue as a must-own volume for spacecraft engineering professionals. Readers of the second edition of Fundamentals of Electric Propulsion readers will also find: Extensive updates to chapters covering hollow cathodes and Hall thrusters, based on vigorous recent research New sections covering magnetic shielding, cathode plume instabilities, and more Figures and homework problems in each chapter to facilitate learning and retention Fundamentals of Electric Propulsion is an essential work for spacecraft engineers and researchers working in spacecraft propulsion and related fields, as well as graduate students in electric propulsion, aerospace science, and space science courses.
Download or read book Computational Modeling of a Hall Thruster Plasma Plume in a Vacuum Tank written by Shannon Yun-Ming Cheng and published by . This book was released on 2002 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Wall Interaction in Hall Thrusters written by Y. Raitses and published by . This book was released on 2005 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
