Ion Engine And Hall Thruster Development At The Nasa Glenn Research Center Nasa Tm 2002 211969 National Aeronautics And Space Adminis

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Ion Engine and Hall Thruster Development at the NASA Glenn Research Center

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721531929
Total Pages : 30 pages
Book Rating : 4.5/5 (319 download)

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Book Synopsis Ion Engine and Hall Thruster Development at the NASA Glenn Research Center by : National Aeronautics and Space Administration (NASA)

Download or read book Ion Engine and Hall Thruster Development at the NASA Glenn Research Center written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: NASA's Glenn Research Center has been selected to lead development of NASA's Evolutionary Xenon Thruster (NEXT) system. The central feature of the NEXT system is an electric propulsion thruster (EPT) that inherits the knowledge gained through the NSTAR thruster that successfully propelled Deep Space 1 to asteroid Braille and comet Borrelly, while significantly increasing the thruster power level and making improvements in performance parameters associated with NSTAR. The EPT concept under development has a 40 cm beam diameter, twice the effective area of the Deep-Space 1 thruster, while maintaining a relatively-small volume. It incorporates mechanical features and operating conditions to maximize the design heritage established by the flight NSTAR 30 cm engine, while incorporating new technology where warranted to extend the power and throughput capability. The NASA Hall thruster program currently supports a number of tasks related to high power thruster development for a number of customers including the Energetics Program (formerly called the Space-based Program), the Space Solar Power Program, and the In-space Propulsion Program. In program year 2002, two tasks were central to the NASA Hall thruster program: 1.) the development of a laboratory Hall thruster capable of providing high thrust at high power; 2.) investigations into operation of Hall thrusters at high specific impulse. In addition to these two primary thruster development activities, there are a number of other on-going activities supported by the NASA Hall thruster program, These additional activities are related to issues such as thruster lifetime and spacecraft integration. Domonkos, Matthew T. and Patterson, Michael J. and Jankovsky, Robert S. Glenn Research Center NASA/TM-2002-211969, NAS 1.15:211969, E-13612, IMECE-2002-34444

Ion Engine and Hall Thruster Development at the NASA Glenn Research Center

Author :
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Ion Engine and Hall Thruster Development at the NASA Glenn Research Center by :

Download or read book Ion Engine and Hall Thruster Development at the NASA Glenn Research Center written by and published by . This book was released on 2002 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Microwave Ecr Ion Thruster Development Activities at NASA Glenn Research Center

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721532490
Total Pages : 32 pages
Book Rating : 4.5/5 (324 download)

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Book Synopsis Microwave Ecr Ion Thruster Development Activities at NASA Glenn Research Center by : National Aeronautics and Space Administration (NASA)

Download or read book Microwave Ecr Ion Thruster Development Activities at NASA Glenn Research Center written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Outer solar system missions will have propulsion system lifetime requirements well in excess of that which can be satisfied by ion thrusters utilizing conventional hollow cathode technology. To satisfy such mission requirements, other technologies must be investigated. One possible approach is to utilize electrodeless plasma production schemes. Such an approach has seen low power application less than 1 kW on earth-space spacecraft such as ARTEMIS which uses the rf thruster the RIT 10 and deep space missions such as MUSES-C which will use a microwave ion thruster. Microwave and rf thruster technologies are compared. A microwave-based ion thruster is investigated for potential high power ion thruster systems requiring very long lifetimes. Foster, John E. and Patterson, Michael J. Glenn Research Center NASA/TM-2002-211877, NAS 1.15:211877, E-13559, AIAA Paper 2002-3837

Critical issues in the history of spaceflight

Author : Steven J. Dick
Publisher : Government Printing Office
ISBN 13 : 9780160877537
Total Pages : 680 pages
Book Rating : 4.8/5 (775 download)

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Book Synopsis Critical issues in the history of spaceflight by : Steven J. Dick

Download or read book Critical issues in the history of spaceflight written by Steven J. Dick and published by Government Printing Office. This book was released on 2018 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Carbon-Based Ion Optics Development at NASA Grc

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721507290
Total Pages : 26 pages
Book Rating : 4.5/5 (72 download)

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Book Synopsis Carbon-Based Ion Optics Development at NASA Grc by : National Aeronautics and Space Administration (NASA)

Download or read book Carbon-Based Ion Optics Development at NASA Grc 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: With recent success of the NSTAR ion thruster on Deep Space 1, there is continued interest in long term, high propellant throughput thrusters to perform energetic missions. This requires flight qualified thrusters that can operate for long periods at high beam density, without degradation in performance resulting from sputter induced grid erosion. Carbon-based materials have shown nearly an order of magnitude improvement in sputter erosion resistance over molybdenum. NASA Glenn Research Center (GRC) has been active over the past several years pursuing carbon-based grid development. In 1995, NASA GRC sponsored work performed by the Jet Propulsion Laboratory to fabricate carbon/carbon composite grids using a machined panel approach. In 1999, a contract was initiated with a commercial vendor to produce carbon/carbon composite grids using a chemical vapor infiltration process. In 2001, NASA GRC purchased pyrolytic carbon grids from a commercial vendor. More recently, a multi-year contract was initiated with North Carolina A&T to develop carbon/carbon composite grids using a resin injection process. The following paper gives a brief overview of these four programs. Haag, Thomas and Patterson, Michael and Rawlin, Vince and Soulas, George Glenn Research Center; Jet Propulsion Laboratory; Marshall Space Flight Center NASA/TM-2002-211501, NAS 1.15:211501, IEPC-01-94, E-13241

Nasa's 2004 Hall Thruster Program

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721678747
Total Pages : 32 pages
Book Rating : 4.6/5 (787 download)

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Book Synopsis Nasa's 2004 Hall Thruster Program by : National Aeronautics and Space Administration (NASA)

Download or read book Nasa's 2004 Hall Thruster Program 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 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of NASA's Hall thruster research and development tasks conducted during fiscal year 2004 is presented. These tasks focus on: raising the technology readiness level of high power Hall thrusters, developing a moderate-power/ moderate specific impulse Hall thruster, demonstrating high-power/high specific impulse Hall thruster operation, and addressing the fundamental technical challenges of emerging Hall thruster concepts. Programmatic background information, technical accomplishments and out year plans for each program element performed under the sponsorship of the In-Space Transportation Program, Project Prometheus, and the Energetics Project are provided. Jacobson, David T. and Manzella, David H. and Hofer, Richard R. and Peterson, Peter Y. Glenn Research Center NASA/TM-2004-213340, AIAA Paper 2004-3600, E-14808

Nasa's Hall Thruster Program

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721297078
Total Pages : 34 pages
Book Rating : 4.2/5 (97 download)

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Book Synopsis Nasa's Hall Thruster Program by : National Aeronautics and Space Administration (NASA)

Download or read book Nasa's Hall Thruster Program written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: NASA's Hall thruster program has base research and focused development efforts in support of the Advanced Space Transportation Program, Space-Based Program, and various other programs. The objective of the base research is to gain an improved understanding of the physical processes and engineering constraints of Hall thrusters to enable development of advanced Hall thruster designs. Specific technical questions that are current priorities of the base effort are: (1) How does thruster life vary with operating point? (2) How can thruster lifetime and wear rate be most efficiently evaluated? (3) What are the practical limitations for discharge voltage as it pertains to high specific impulse operation (high discharge voltage) and high thrust operation (low discharge voltage)? (4) What are the practical limits for extending Hall thrusters to very high input powers? and (5) What can be done during thruster design to reduce cost and integration concerns? The objective of the focused development effort is to develop a 50 kW-class Hall propulsion system, with a milestone of a 50 kW engineering model thruster/system by the end of program year 2006. Specific program wear 2001 efforts, along with the corporate and academic participation, are described. Jankovsky, Robert S. and Jacobson, David T. and Rawlin, Vincent K. and Mason, Lee S. and Mantenieks, Maris A. and Manzella, David H. and Hofer, Richard R. and Peterson, Peter Y. Glenn Research Center NASA/TM-2001-211215, E-13067, NAS 1.15:211215, AIAA Paper 2001-3888

The Rise and Fall of COMSAT

Author : D. Whalen
Publisher : Palgrave Macmillan
ISBN 13 : 9781137396914
Total Pages : 0 pages
Book Rating : 4.3/5 (969 download)

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Book Synopsis The Rise and Fall of COMSAT by : D. Whalen

Download or read book The Rise and Fall of COMSAT written by D. Whalen and published by Palgrave Macmillan. This book was released on 2014-05-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: After pioneering this technology and growing the market, COMSAT fell prey to changes in government policy and to its own lack of entrepreneurial talent. The author explores the factors which contributed to this rise and fall of COMSAT.

High-Power Hall Propulsion Development at NASA Glenn Research Center

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781793968333
Total Pages : 30 pages
Book Rating : 4.9/5 (683 download)

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Book Synopsis High-Power Hall Propulsion Development at NASA Glenn Research Center by : National Aeronautics and Space Adm Nasa

Download or read book High-Power Hall Propulsion Development at NASA Glenn Research Center written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-14 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Office of the Chief Technologist Game Changing Division is sponsoring the development and testing of enabling technologies to achieve efficient and reliable human space exploration. High-power solar electric propulsion has been proposed by NASA's Human Exploration Framework Team as an option to achieve these ambitious missions to near Earth objects. NASA Glenn Research Center (NASA Glenn) is leading the development of mission concepts for a solar electric propulsion Technical Demonstration Mission. The mission concepts are highlighted in this paper but are detailed in a companion paper. There are also multiple projects that are developing technologies to support a demonstration mission and are also extensible to NASA's goals of human space exploration. Specifically, the In-Space Propulsion technology development project at NASA Glenn has a number of tasks related to high-power Hall thrusters including performance evaluation of existing Hall thrusters; performing detailed internal discharge chamber, near-field, and far-field plasma measurements; performing detailed physics-based modeling with the NASA Jet Propulsion Laboratory's Hall2De code; performing thermal and structural modeling; and developing high-power efficient discharge modules for power processing. This paper summarizes the various technology development tasks and progress made to date Kamhawi, Hani and Manzella, David H. and Smith, Timothy D. and Schmidt, George R. Glenn Research Center WBS 182603.01.04.02

An Overview of Electric Propulsion Activities at NASA

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721678037
Total Pages : 34 pages
Book Rating : 4.6/5 (78 download)

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Book Synopsis An Overview of Electric Propulsion Activities at NASA by : National Aeronautics and Space Administration (NASA)

Download or read book An Overview of Electric Propulsion Activities at NASA written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides an overview of NASA s activities in the area of electric propulsion with an emphasis on project directions, recent progress, and a view of future project directions. The goals of the electric propulsion programs are to develop key technologies to enable new and ambitious science missions and to transfer these technologies to industry. Activities include the development of gridded ion thruster technology, Hall thruster technology, pulsed plasma thruster technology, and very high power electric propulsion technology, as well as systems technology that supports practical implementation of these advanced concepts. The performance of clusters of ion and Hall thrusters is being revisited. Mission analyses, based on science requirements and preliminary mission specifications, guide the technology projects and introduce mission planners to new capabilities. Significant in-house activity, with strong industrial/academia participation via contracts and grants, is maintained to address these development efforts. NASA has initiated a program covering nuclear powered spacecraft that includes both reactor and radioisotope power sources. This has provided an impetus to investigate higher power and higher specific impulse thruster systems. NASA continues to work closely with both supplier and user communities to maximize the understanding and acceptance of new technology in a timely and cost-effective manner. NASA s electric propulsion efforts are closely coordinated with Department of Defense and other national programs to assure the most effective use of available resources. Several NASA Centers are actively involved in these electric propulsion activities, including, the Glenn Research Center, Jet Propulsion Laboratory, Johnson Space Center, and Marshall Space Flight Center. Dunning, John W., Jr. and Hamley, John A. and Jankovsky, Robert S. and Oleson, Steven R. Glenn Research Center NASA/TM-2004-213329, AIAA Paper 2004-3328, E-14790

Hall Thruster Technology for NASA Science Missions

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721814589
Total Pages : 34 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Hall Thruster Technology for NASA Science Missions by : National Aeronautics and Space Administration (NASA)

Download or read book Hall Thruster Technology for NASA Science Missions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of a prototype Hall thruster designed for Discovery-class NASA science mission applications was evaluated at input powers ranging from 0.2 to 2.9 kilowatts. These data were used to construct a throttle profile for a projected Hall thruster system based on this prototype thruster. The suitability of such a Hall thruster system to perform robotic exploration missions was evaluated through the analysis of a near Earth asteroid sample return mission. This analysis demonstrated that a propulsion system based on the prototype Hall thruster offers mission benefits compared to a propulsion system based on an existing ion thruster. Manzella, David and Oh, David and Aadland, Randall Glenn Research Center; Jet Propulsion Laboratory NASA/TM-2005-214020, AIAA Paper 2005-3675, E-15335

Development of an Ion Thruster and Power Processor for New Millennium's Deep Space 1 Mission

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722163853
Total Pages : 32 pages
Book Rating : 4.1/5 (638 download)

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Book Synopsis Development of an Ion Thruster and Power Processor for New Millennium's Deep Space 1 Mission by : National Aeronautics and Space Administration (NASA)

Download or read book Development of an Ion Thruster and Power Processor for New Millennium's Deep Space 1 Mission written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Solar Electric Propulsion Technology Applications Readiness Program (NSTAR) will provide a single-string primary propulsion system to NASA's New Millennium Deep Space 1 Mission which will perform comet and asteroid flybys in the years 1999 and 2000. The propulsion system includes a 30-cm diameter ion thruster, a xenon feed system, a power processing unit, and a digital control and interface unit. A total of four engineering model ion thrusters, three breadboard power processors, and a controller have been built, integrated, and tested. An extensive set of development tests has been completed along with thruster design verification tests of 2000 h and 1000 h. An 8000 h Life Demonstration Test is ongoing and has successfully demonstrated more than 6000 h of operation. In situ measurements of accelerator grid wear are consistent with grid lifetimes well in excess of the 12,000 h qualification test requirement. Flight hardware is now being assembled in preparation for integration, functional, and acceptance tests. Sovey, James S. and Hamley, John A. and Haag, Thomas W. and Patterson, Michael J. and Pencil, Eric J. and Peterson, Todd T. and Pinero, Luis R. and Power, John L. and Rawlin, Vincent K. and Sarmiento, Charles J. and Anderson, John R. and Bond, Thomas A. and Cardwell, G. I. and Christensen, Jon A. Glenn Research Center; Jet Propulsion Laboratory RTOP 242-70-01...

Internal Plasma Properties and Enhanced Performance of an 8 Cm Ion Thruster Discharge

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721192823
Total Pages : 30 pages
Book Rating : 4.1/5 (928 download)

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Book Synopsis Internal Plasma Properties and Enhanced Performance of an 8 Cm Ion Thruster Discharge by : National Aeronautics and Space Administration (NASA)

Download or read book Internal Plasma Properties and Enhanced Performance of an 8 Cm Ion Thruster Discharge written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a need for a lightweight, low power ion thruster for space science missions. Such an ion thruster is under development at NASA Glenn Research Center. In an effort to better understand the discharge performance of this thruster. a version of this thruster with an anode containing electrically isolated electrodes at the cusps was fabricated and tested. Discharge characteristics of this ring cusp ion thruster were measured without ion beam extraction. Discharge current was measured at collection electrodes located at the cusps and at the anode body itself. Discharge performance and plasma properties were measured as a function of discharge power, which was varied between 20 and 50 W. It was found that ion production costs decreased by as much as 20 percent when the two most downstream cusp electrodes were allowed to float. Floating the electrodes did not give rise to a significant increase in discharge power even though the plasma density increased markedly. The improved performance is attributed to enhanced electron containment. Foster, John E. and Patterson, Michael J. Glenn Research Center NASA/TM-1999-209386, E-11813, NAS 1.15:209386

Design and Performance of 40 CM Ion Optics

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781726673877
Total Pages : 42 pages
Book Rating : 4.6/5 (738 download)

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Book Synopsis Design and Performance of 40 CM Ion Optics by : National Aeronautics and Space Adm Nasa

Download or read book Design and Performance of 40 CM Ion Optics written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-03 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 40 cm ion thruster is being developed at the NASA Glenn Research Center to obtain input power and propellant throughput capabilities of 10 kW and 550 kg. respectively. The technical approach here is a continuation of the "derating" technique used for the NSTAR ion thruster. The 40 cm ion thruster presently utilizes the NSTAR ion optics aperture geometry to take advantage of the large database of lifetime and performance data already available. Dome-shaped grids were chosen for the design of the 40 cm ion optics because this design is naturally suited for large-area ion optics. Ion extraction capabilities and electron backstreaming limits for the 40 cm ion optics were estimated by utilizing NSTAR 30 cm ion optics data. A preliminary service life assessment showed that the propellant throughput goal of 550 kg of xenon may be possible with molybdenum 40 cm ion optics. One 40 cm ion optics' set has been successfully fabricated to date. Additional ion optics' sets are presently being fabricated. Preliminary performance tests were conducted on a laboratory model 40 cm ion thruster. Soulas, George C. Glenn Research Center; Marshall Space Flight Center NASA/TM-2001-211275, E-13074, IEPC-01-090, NAS 1.15:211275

Mission Advantages of Next

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721527397
Total Pages : 28 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Mission Advantages of Next by : National Aeronautics and Space Administration (NASA)

Download or read book Mission Advantages of Next written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the demonstration of the NSTAR propulsion system on the Deep Space One mission, the range of the Discovery class of NASA missions can now be expanded. NSTAR lacks, however, sufficient performance for many of the more challenging Office of Space Science (OSS) missions. Recent studies have shown that NASA's Evolutionary Xenon Thruster (NEXT) ion propulsion system is the best choice for many exciting potential OSS missions including outer planet exploration and inner solar system sample returns. The NEXT system provides the higher power, higher specific impulse, and higher throughput required by these science missions. Oleson, Steven and Gefert, Leon and Benson, Scott and Patterson, Michael and Noca, Muriel and Sims, Jon Glenn Research Center; Jet Propulsion Laboratory NASA/TM-2002-211892, E-13574, NAS 1.15:211892, AIAA Paper 2002-3969

The High Power Electric Propulsion (HiPEP) Ion Thruster

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721673704
Total Pages : 34 pages
Book Rating : 4.6/5 (737 download)

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Book Synopsis The High Power Electric Propulsion (HiPEP) Ion Thruster by : National Aeronautics and Space Administration (NASA)

Download or read book The High Power Electric Propulsion (HiPEP) Ion Thruster 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 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practical implementation of the proposed Jupiter Icy Moon Orbiter (JIMO) mission, which would require a total delta V of approximately 38 km/s, will require the development of a high power, high specific impulse propulsion system. Initial analyses show that high power gridded ion thrusters could satisfy JIMO mission requirements. A NASA GRC-led team is developing a large area, high specific impulse, nominally 25 kW ion thruster to satisfy both the performance and the lifetime requirements for this proposed mission. The design philosophy and development status as well as a thruster performance assessment are presented. Foster, John E. and Haag, Tom and Patterson, Michael and Williams, George J., Jr. and Sovey, James S. and Carpenter, Christian and Kamhawi, Hani and Malone, Shane and Elliot, Fred Glenn Research Center NASA/TM-2004-213194, E-14693, AIAA Paper 2004-3812

A Hall Thruster Performance Model Incorporating the Effects of a Multiply-Charged Plasma

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721294336
Total Pages : 32 pages
Book Rating : 4.2/5 (943 download)

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Book Synopsis A Hall Thruster Performance Model Incorporating the Effects of a Multiply-Charged Plasma by : National Aeronautics and Space Administration (NASA)

Download or read book A Hall Thruster Performance Model Incorporating the Effects of a Multiply-Charged Plasma written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 32 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