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Plume And Discharge Plasma Measurements Of An Nstar Type Ion Thruster
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Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781724087355 Total Pages :40 pages Book Rating :4.0/5 (873 download)
Book Synopsis Plume and Discharge Plasma Measurements of an Nstar-Type Ion Thruster by : National Aeronautics and Space Adm Nasa
Download or read book Plume and Discharge Plasma Measurements of an Nstar-Type Ion Thruster written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-27 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The success of the NASA Deep Space I spacecraft has demonstrated that ion propulsion is a viable option for deep space science missions. More aggressive missions such as Comet Nuclear Sample Return and Europa lander will require higher power, higher propellant throughput and longer thruster lifetime than the NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) engine. Presented here are thruster plume and discharge plasma measurements of an NSTAR-type thruster operated from 0.5 kW to 5 kW. From Faraday plume sweeps, beam divergence was determined. From Langmuir probe plume measurements on centerline, low energy ion production on axis due to charge-exchange and direct ionization was assessed. Additionally, plume plasma potential measurements made on axis were used to determine the upper energy limits at which ions created on centerline could be radially accelerated. Wall probes flush-mounted to the thruster discharge chamber anode were used to assess plasma conditions. Langmuir probe measurements at the wall indicated significant differences in the electron temperature in the cylindrical and conical sections of the discharge chamber. Foster, John E and Soulas, George C. and Patterson, Michael J. Glenn Research Center NASA/TM-2000-210382, E-12438, AIAA Paper 2000-3812, NAS 1.15:210382
Book Synopsis Plume and Discharge Plasma Measurements of an NSTAR-type Ion Thruster by : John E. Foster
Download or read book Plume and Discharge Plasma Measurements of an NSTAR-type Ion Thruster written by John E. Foster and published by . This book was released on 2000 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721815036 Total Pages :34 pages Book Rating :4.8/5 (15 download)
Book Synopsis Near Discharge Cathode Assembly Plasma Potential Measurements in a 30-CM Nstar Type Ion Engine During Beam Extraction by : National Aeronautics and Space Administration (NASA)
Download or read book Near Discharge Cathode Assembly Plasma Potential Measurements in a 30-CM Nstar Type Ion Engine During Beam Extraction 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: Floating emissive probe plasma potential data are presented over a two-dimensional array of locations in the near Discharge Cathode Assembly (DCA) region of a 30-cm diameter ring-cusp ion thruster. Discharge plasma data are presented with beam extraction at throttling conditions comparable to the NASA TH Levels 8, 12, and 15. The operating conditions of the Extended Life Test (ELT) of the Deep Space One (DS1) flight spare ion engine, where anomalous discharge keeper erosion occurred, were TH 8 and TH 12 consequently they are of specific interest in investigating discharge keeper erosion phenomena. The data do not validate the presence of a potential hill plasma structure downstream of the DCA, which has been proposed as a possible erosion mechanism. The data are comparable in magnitude to data taken by other researchers in ring-cusp electron-bombardment ion thrusters. The plasma potential structures are insensitive to thruster throttling level with a minimum as low as 14 V measured at the DCA exit plane and increasing gradually in the axial direction. A sharp increase in plasma potential to the bulk discharge value of 26 to 28 volts, roughly 10 mm radially from DCA centerline, was observed. Plasma potential measurements indicate a low-potential plume structure that is roughly 20 mm in diameter emanating from the discharge cathode that may be attributed to a free-standing plasma double layer. Herman, Daniel A. and Gallimore, Alec D. Glenn Research Center NASA/CR-2006-213296, AIAA Paper 2004-3958, E-14743
Book Synopsis Fundamentals of Electric Propulsion by : Dan M. Goebel
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.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721815500 Total Pages :36 pages Book Rating :4.8/5 (155 download)
Book Synopsis Discharge Chamber Plasma Structure of a 30-CM Nstar-Type Ion Engine by : National Aeronautics and Space Administration (NASA)
Download or read book Discharge Chamber Plasma Structure of a 30-CM Nstar-Type Ion Engine 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 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single Langmuir probe measurements are presented over a two-dimensional array of locations in the near Discharge Cathode Assembly (DCA) region of a 30-cm diameter ring cusp ion thruster over a range of thruster operating conditions encompassing the high-power half of the NASA throttling table. The Langmuir probe data were analyzed with two separate methods. All data were analyzed initially assuming an electron population consisting of Maxwellian electrons only. The on-axis data were then analyzed assuming both Maxwellian and primary electrons. Discharge plasma data taken with beam extraction exhibit a broadening of the higher electron temperature plume boundary compared to similar discharge conditions without beam extraction. The opposite effect is evident with the electron/ion number density as the data without began, extraction appears to be more collimated than the corresponding data with beam extraction. Primary electron energy and number densities are presented for one operating condition giving an order of magnitude of their value and the error associated with this calculation. Herman, Daniel A. and Gallimore, Alec D. Glenn Research Center NASA/CR-2006-213299, AIAA Paper 2004-3794, E-14746
Book Synopsis Ion and Electron Transport in an NSTAR-Derivative Ion Thruster by :
Download or read book Ion and Electron Transport in an NSTAR-Derivative Ion Thruster written by and published by . This book was released on 2001 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NSTAR Ion Thruster Plume Impact Assessments by :
Download or read book NSTAR Ion Thruster Plume Impact Assessments written by and published by . This book was released on 1995 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit: 2000-3800 - 2000-3849 by :
Download or read book 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit: 2000-3800 - 2000-3849 written by and published by . This book was released on 2000 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Instrument Development and Plasma Measurements on a 200-watt Hall Thruster Plume by : Yassir Azziz
Download or read book Instrument Development and Plasma Measurements on a 200-watt Hall Thruster Plume written by Yassir Azziz and published by . This book was released on 2003 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721610686 Total Pages :32 pages Book Rating :4.6/5 (16 download)
Book Synopsis Ion Voltage Diagnostics in the Far-Field Plume of a High-Specific Impulse Hall Thruster by : National Aeronautics and Space Administration (NASA)
Download or read book Ion Voltage Diagnostics in the Far-Field Plume of a High-Specific Impulse Hall Thruster written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of the magnetic field and discharge voltage on the far-field plume of the NASA 173Mv2 laboratory-model Hall thruster were investigated. A cylindrical Langmuir probe was used to measure the plasma potential and a retarding potential analyzer was employed to measure the ion voltage distribution. The plasma potential was affected by relatively small changes in the external magnetic field, which suggested a means to control the plasma surrounding the thruster. As the discharge voltage increased, the ion voltage distribution showed that the acceleration efficiency increased and the dispersion efficiency decreased. This implied that the ionization zone was growing axially and moving closer to the anode, which could have affected thruster efficiency and lifetime due to higher wall losses. However, wall losses may have been reduced by improved focusing efficiency since the total efficiency increased and the plume divergence decreased with discharge voltage. Hofer, Richard R. and Haas, James M. and Gallimore, Alec D. Glenn Research Center NASA/CR-2003-212895, AIAA Paper 2003-4556, E-14313
Book Synopsis The Use of Electrostatic Probes to Characterize the Discharge Plasma Structure and Identify Discharge Cathode Erosion Mechanisms in Ring-cusp Ion Thrusters by : Daniel A. Herman
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 Synopsis Ion Voltage Diagnostics in the Far-Field Plume of a High-Specific Impulse Hall Thruster by : Richard R. Hofer
Download or read book Ion Voltage Diagnostics in the Far-Field Plume of a High-Specific Impulse Hall Thruster written by Richard R. Hofer and published by BiblioGov. This book was released on 2013-06 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of the magnetic field and discharge voltage on the far-field plume of the NASA 173Mv2 laboratory-model Hall thruster were investigated. A cylindrical Langmuir probe was used to measure the plasma potential and a retarding potential analyzer was employed to measure the ion voltage distribution. The plasma potential was affected by relatively small changes in the external magnetic field, which suggested a means to control the plasma surrounding the thruster. As the discharge voltage increased, the ion voltage distribution showed that the acceleration efficiency increased and the dispersion efficiency decreased. This implied that the ionization zone was growing axially and moving closer to the anode, which could have affected thruster efficiency and lifetime due to higher wall losses. However, wall losses may have been reduced by improved focusing efficiency since the total efficiency increased and the plume divergence decreased with discharge voltage.
Book Synopsis Stationary Plasma Thruster Plume Characteristics by :
Download or read book Stationary Plasma Thruster Plume Characteristics written by and published by . This book was released on 1994 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Discharge Plasma Parameters in a 30 Cm NSTAR Type Ion Engine with and Without Beam Extraction by : Daniel A. Herman
Download or read book Comparison of Discharge Plasma Parameters in a 30 Cm NSTAR Type Ion Engine with and Without Beam Extraction written by Daniel A. Herman and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Performance of 40 Cm Ion Optics by :
Download or read book Design and Performance of 40 Cm Ion Optics written by and published by . This book was released on 2001 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stationary Plasma Thruster Plume Emissions by :
Download or read book Stationary Plasma Thruster Plume Emissions written by and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pulsed Plasma Thruster Plume Study: Symmetry and Impact on Spacecraft Surfaces by : Lynn A. Arrington
Download or read book Pulsed Plasma Thruster Plume Study: Symmetry and Impact on Spacecraft Surfaces written by Lynn A. Arrington and published by . This book was released on 2000 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
