Download or read book Performance Characterization of a Three axis Hall Effect Thruster written by Spencer E. Temkin and published by . This book was released on 2010 with total page 260 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 Performance Characteristics of a 5 KW Laboratory Hall Thruster written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The University of Michigan and United States Air Force Research Laboratory have jointly developed a 5 kW class Hall effect thruster. This thruster was developed to investigate, with a variety of diagnostics, a thruster similar to that specified by IHPRPT goals. The configuration of this thruster is adjustable so that diagnostic access to the interior of the thruster can be provided as necessary, and to allow for the exploration of various thruster geometries. At nominal conditions, the thruster was designed to operate at 5 kW with a predicted specific impulse of 2200 s. The actual operating parameters at 5 kW were 2326 s specific impulse, with 246 mN of thrust at an efficiency of 57%. These conditions are comparable to those of thrusters under commercial development, making the information learned from the study of this thruster applicable to the understanding of its commercial counterparts.
Download or read book Thermal Characterization of a Hall Effect Thruster written by Alex M. Bohnert and published by . This book was released on 2008 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The thermal characteristics of a Hall thruster directly influence thruster and spacecraft design. High temperatures affect the magnetic coil capabilities and cause higher insulator erosion rates, influencing both thruster performance and lifetime. The Hall thruster transfers heat through both radiation and conduction, and the spacecraft must handle this additional thermal energy. An infrared camera provides a non-intrusive method to analyze the thermal characteristics of an operational Hall thruster. This thesis contains the thermal analysis of a Busek Co. Inc. 200 W Hall thruster, using a FLIR ThermaCAM SC640 infrared camera. The Space Propulsion Analysis and System Simulator Laboratory at the Air Force Institute of Technology on Wright-Patterson Air Force Base provided the location for thruster set up and operation. The infrared camera furnishes the surface temperatures for the entire thruster, and approximates the transient heating behavior during start up, steady state, and shut down. Thermocouples verify and correct the camera data. Experimentally determined emissivities characterize the materials of the thruster. In addition, a view factor analysis between the camera pixels and the alumina sprayed portion of the cathode determines the exchange of radiation between the pixels and cathode surface. This process develops a technique to map surface temperatures of complex geometries with confidence in the actual values. Accurately mapping the surface temperatures of a Hall Effect thruster will improve both thruster efficiency and lifetime, and predict the thruster's thermal load on a satellite."--Report documentation page.
Download or read book Characterization of a Hall Effect Thruster Using Thermal Imaging written by James William Tomaszewski and published by . This book was released on 2007 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book RHETT EPDM Performance Characterization written by T. Haag and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The 8 CM Ion Thruster Characterization written by and published by . This book was released on 1983 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Characterization of the High Power Helicon Plasma Thruster with Varying Magnetic Nozzle Configurations written by Ilia Slobodov and published by . This book was released on 2011 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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.
Download or read book Performance Characteristics of a 5 kW Laboratory Hall Thruster written by James M. Haas and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analytical and Numerical Performance Characterization of a 13 Cm Electron Bombardment Ion Thruster with Experimental Verification written by Steven H. Hu and published by . This book was released on 2007 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study to examine the optimal magnet configuration of a 13 cm electron bombardment ion thruster with regards to performance. The performance of the thruster was determined by the evaluation of discharge loss at particular mass utilization efficiencies.
Download or read book Performance Characterization of a 15 cm Ion Thruster with Simulated Beam Extraction written by Anup Sanghera and published by . This book was released on 2006 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the effects of magnet geometry and the position of the cathode filament on the performance and the beam profiles of a 15-centimeter ion thruster. Five magnet geometries, including the original, were tested, each with four cathode filament positions. How well the thruster worked was determined by plotting the performance curves (plots of the discharge loss vs. the mass utilization efficiency). Beam profiles were found using a Langmuir probe inserted into the discharge chamber.
Download or read book Performance Characterization Tests of Three 0 44 N 0 1 lbf Hydrazine Catalytic Thrusters written by P. I. Moynihan and published by . This book was released on 1973 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Characterization of a High Efficiency Gas fed Pulsed Plasma Thruster written by John K. Ziemer and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulated beam extraction performance characterization of a 50 cm ion thruster discharge written by John E. Foster and published by . This book was released on 2013 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
