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Book Effects of Facility Backpressure on the Performance and Plume of a Hall Thruster

Download or read book Effects of Facility Backpressure on the Performance and Plume of a Hall Thruster written by Mitchell Louis Ronald Walker and published by . This book was released on 2005 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Comprehensive Investigation of Facility Effects on the Testing of High Power Monolithic and Clustered Hall Thruster Systems

Download or read book A Comprehensive Investigation of Facility Effects on the Testing of High Power Monolithic and Clustered Hall Thruster Systems written by and published by . This book was released on 2006 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research focuses on understanding the relationship between facility background pressure and Hall effect thruster/cluster performance and plume characteristics. It is difficult for researchers to make adequate comparisons between data sets because of both differences in instrumentation and back pressures due to the wide range of facilities used in Hall thruster testing. Thus, tools are needed that allow researchers to obtain relevant plume and performance data for a variety of chambers and back pressures. This research is divided into three parts. The first is the development of a technique for calibrating a vacuum chamber in terms of pressure. The second is an investigation of facility effects; i.e., how elevated facility back pressure affects thruster performance, plume plasma parameters, and plume diagnostics. The third portion of this research is an investigation of the performance and plume characteristics of a cluster of UM/AFRL P5 5 kw Hall thrusters operated over a wide range of facility back pressures.

Book Journal of Thermophysics and Heat Transfer

Download or read book Journal of Thermophysics and Heat Transfer written by and published by . This book was released on 2006 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: This journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. It publishes papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include conductive, convective, and radiative modes alone or in combination and the effects of the environment.

Book Theoretical and Numerical Studies of Plume Flows in Vacuum Chambers

Download or read book Theoretical and Numerical Studies of Plume Flows in Vacuum Chambers written by Chunpei Cai and published by . This book was released on 2005 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Dissertation Abstracts International

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Evaluation of Krypton Propellant in Hall Thrusters

Download or read book An Evaluation of Krypton Propellant in Hall Thrusters written by Jesse Allen Linnell and published by . This book was released on 2006 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Use of Electrostatic Probes to Characterize the Discharge Plasma Structure and Identify Discharge Cathode Erosion Mechanisms in Ring cusp Ion Thrusters

Download or read book The Use of Electrostatic Probes to Characterize the Discharge Plasma Structure and Identify Discharge Cathode Erosion Mechanisms in Ring cusp Ion Thrusters written by Daniel A. Herman and published by . This book was released on 2005 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Performance Characterization and Optimization of a Diverging Cusped Field Thruster with a Calibrated Counter weighted Millinewton Thrust Stand

Download or read book Performance Characterization and Optimization of a Diverging Cusped Field Thruster with a Calibrated Counter weighted Millinewton Thrust Stand written by Ryan M. Daspit and published by . This book was released on 2012 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: The previously developed Diverging Cusped Field Thruster (DCFT) has undergone further investigations and performance characterization. The DCFT is a magnetically conned plasma thruster that uses cusped magnetic fields to confine electron ow and reduce losses to the walls. The magnetic confinement of the plasma away from the walls also reduces wall erosion to increase thruster lifetime. Additionally, modifications to the original DCFT have increased robustness and decreased mass to become more desirable for space flight. Research on reducing the plasma plume divergence of the thruster by altering the magnetic field has also been performed. The DCFT has exhibited competitive thrust and eciency performance when compared to typical Hall thrusters of similar size. Specifically, the anode eciency reached a maximum of 39.3% providing 11.8 mN of thrust with a specific impulse of 1436 s. The xenon mass ow rate to the anode was 8.5 standard cubic centimeters per minute, and the power consumption was 210 W. Two distinct modes, as well as a \mixed" mode, were observed during performance testing and had signicant, though not completely predictable, effects on thruster performance. The modes differ in plasma diffusivity and anode current. Facility effects, such as chamber back pressure and cathode coupling, on performance were also briefly y researched. In order to characterize the performance of the DCFT, the Milli-Newton Thrust Stand (MiNTS) was developed. The MiNTS is a non-conventional torsional-style thrust stand capable of measuring thrust in the range of 3 to 20 mN with an accuracy of up to 0.2 mN. Calibration of the stand is necessary to map the output of the MiNTS to the force felt by it. A calibration stand was designed to apply a known force to the MiNTS using weights. The MiNTS is controlled by a Labview Virtual Instrument that can measure and counteract the force of the DCFT. Drift forces due to external connections to the MiNTS and thermal transfer from the DCFT are also studied, and processes for negating the drift forces are provided.

Book Fundamentals of Electric Propulsion

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.