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Plasma Potential And Langmuir Probe Measurements In The Near Field Plume Of The Nasa 457mv2 Hall Thruster
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Book Synopsis Plasma Potential and Langmuir Probe Measurements in the Near-Field Plume of the Nasa-457mv2 Hall Thruster by : Rohit Shastry
Download or read book Plasma Potential and Langmuir Probe Measurements in the Near-Field Plume of the Nasa-457mv2 Hall Thruster written by Rohit Shastry 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 NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720663096 Total Pages :28 pages Book Rating :4.6/5 (63 download)
Book Synopsis Plasma Characteristics Measured in the Plume of a Next Multi-Thruster Array by : National Aeronautics and Space Administration (NASA)
Download or read book Plasma Characteristics Measured in the Plume of a Next Multi-Thruster Array written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma properties in the plume produced by a 3+1 NEXT thruster array operating at full power were mapped using a series of planar Langmuir probes. The Langmuir probes were swept across the diameters of each thruster as well as the centerline of the array at multiple downstream axial locations to produce a plasma map of the plume produced by the array. Such maps yielded the spatial distribution of the plasma density, the electron temperature and the plasma potential in the near field of the array. This spatial information provides insight into local plasma particle flow. Flow direction is particularly important from both an array lifetime and spacecraft-plume plasma interaction standpoint. The variation in the plume plasma parameters tended to vary in a manner consistent with both plume shape and overlap of adjacent plumes.Foster, John E. and Patterson, Michael and Pencil, Eric and McEwen, Heather and Diaz, EstherGlenn Research CenterPLUMES; PLASMAS (PHYSICS); THRUSTORS; PLASMA POTENTIALS; ELECTROSTATIC PROBES; SPATIAL DISTRIBUTION; ELECTRON ENERGY; PLASMA DENSITY; NEAR FIELDS
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:
Book Synopsis Langmuir Probe in Theory and Practice by : Evgeny V. Shun'ko
Download or read book Langmuir Probe in Theory and Practice written by Evgeny V. Shun'ko and published by Universal-Publishers. This book was released on 2009 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: From flat-panel televisions to thermonuclear fusion for energy production, plasmas currently have numerous and wide applications in sciences and industry. A diversity of plasma diagnostics is available to physicists and engineers to measure and control plasma parameters. Among them, the Langmuir probe is the most inexpensive and most popular instrument and method. The Langmuir probe is a small electrode which is submerged in plasma in order to measure the probe current-voltage characteristic. The same characteristic is processed further to derive the electron and ion concentration, the electron distribution function, and the plasma potential at the probe location. Langmuir probe diagnostics afford rapid measurements of the electron distribution function and plasma potential at a good time resolution, 10-8 seconds in a wide range of plasma densities 10+3 - 10+14 cm-3, and the electron energy from the room temperature to hundreds of electron-volts - qualities which are essential for researchers. In view of these facts, Langmuir probe diagnostics are applied very frequently to measuring plasma parameters. This book will be useful in teaching plasma diagnostics to undergraduate and graduate students in plasma physics courses. And it will also serve as a practical reference manual for physicists and engineers working in the growing area of plasma physics. The reader of this book will learn what kind of plasma parameters the Langmuir probe can measure, how to develop the probe diagnostics for specific cases, and how the probe data obtained should be processed to deduce reliable plasma parameters. In this book, the reader can find not only the basic physics information important to understanding the principles of probe operation, but also how the "real" probe disturbs plasma, and how it is possible to reconstruct undisturbed plasma parameters with available probe data.
Book Synopsis Transport-property and Mass Spectral Measurements in the Plasma Exhaust Plume of a Hall-effect Space Propulsion System by : Lyon Bradley King
Download or read book Transport-property and Mass Spectral Measurements in the Plasma Exhaust Plume of a Hall-effect Space Propulsion System written by Lyon Bradley King and published by . This book was released on 1998 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721798063 Total Pages :26 pages Book Rating :4.7/5 (98 download)
Book Synopsis Thruster Plume Plasma Diagnostics by : National Aeronautics and Space Administration (NASA)
Download or read book Thruster Plume Plasma Diagnostics 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 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although detailed near field (0 to 3 cm) information regarding the exhaust plume of a two kilowatt arc jet is available (refs. 1 to 6), there is virtually little or no information (outside of theoretical extrapolations) available concerning the far field (2.6 to 6.1 m). Furthermore real information about the plasma at distances between (3 to 6 m) is of critical importance to high technology satellite companies in understanding the effect of arc jet plume exhausts on space based power systems. It is therefore of utmost importance that one understands the exact nature of the interaction between the arc jet plume, the spacecraft power system and the surrounding electrical plasma environment. A good first step in understanding the nature of the interactions lies in making the needed plume parameter measurements in the far field. All diagnostic measurements are performed inside a large vacuum system (12 m diameter by 18 m high) with a full scale arc jet and solar array panel in the required flight configuration geometry. Thus, necessary information regarding the plume plasma parameters in the far field is obtained. Measurements of the floating potential, the plasma potential, the electron temperature, number density, density distribution, debye length, and plasma frequency are obtained at various locations about the array (at vertical distances from the arc jet nozzle: 2.6, 2.7, 2.8, 3.2, 3.6, 4.0, 4.9, 5.0, 5.4, 5.75, and 6.14 m). Plasma diagnostic parameters are measured for both the floating and grounded configurations of the arc jet anode and array. Spectroscopic optical measurements are then acquired in close proximity to the nozzle, and contamination measurements are made in the vicinity of the array utilizing a mass spectrometer and two Quartz Crystal Microbalances (QCM's). Galofaro, Joel T. and Vayner, Boris V. and Hillard, G. Barry and Chornak, Michael T. Glenn Research Center NASA/TM-2005-213837, E-15207
Book Synopsis Experimental Investigations of Plasma Parameters and Species-dependent Ion Energy Distribution in the Plasma Exhaust Plume of a Hall Thruster by : Sang-Wook Kim
Download or read book Experimental Investigations of Plasma Parameters and Species-dependent Ion Energy Distribution in the Plasma Exhaust Plume of a Hall Thruster written by Sang-Wook Kim and published by . This book was released on 1999 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Langmuir Probe Measurements in the Plume of a Pulsed Plasma Thruster by : Robert Francis Eckman
Download or read book Langmuir Probe Measurements in the Plume of a Pulsed Plasma Thruster written by Robert Francis Eckman and published by . This book was released on 1999 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781719396745 Total Pages :26 pages Book Rating :4.3/5 (967 download)
Book Synopsis A New Method for Analyzing Near-Field Faraday Probe Data in Hall Thrusters by : National Aeronautics and Space Administration (NASA)
Download or read book A New Method for Analyzing Near-Field Faraday Probe Data in Hall Thrusters written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a new method for analyzing near-field Faraday probe data obtained from Hall thrusters. Traditional methods spawned from far-field Faraday probe analysis rely on assumptions that are not applicable to near-field Faraday probe data. In particular, arbitrary choices for the point of origin and limits of integration have made interpretation of the results difficult. The new method, called iterative pathfinding, uses the evolution of the near-field plume with distance to provide feedback for determining the location of the point of origin. Although still susceptible to the choice of integration limits, this method presents a systematic approach to determining the origin point for calculating the divergence angle. The iterative pathfinding method is applied to near-field Faraday probe data taken in a previous study from the NASA-300M and NASA-457Mv2 Hall thrusters. Since these two thrusters use centrally mounted cathodes the current density associated with the cathode plume is removed before applying iterative pathfinding. A procedure is presented for removing the cathode plume. The results of the analysis are compared to far-field probe analysis results. This paper ends with checks on the validity of the new method and discussions on the implications of the results. Huang, Wensheng and Shastry, Rohit and Herman, Daniel A. and Soulas, George C. and Kamhawi, Hani Glenn Research Center HALL THRUSTERS; ELECTRIC PROPULSION; NEAR FIELDS; ELECTROSTATIC PROBES; DATA PROCESSING; ITERATION; GROUND TESTS; CURRENT DENSITY; CATHODES
Book Synopsis Plasma Diagnostics in the Near Field Plume of a Hall Thruster by : Kai-Mei C. Fu
Download or read book Plasma Diagnostics in the Near Field Plume of a Hall Thruster written by Kai-Mei C. Fu and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plasma Properties in the Plume of a Hall Thruster Cluster by :
Download or read book Plasma Properties in the Plume of a Hall Thruster Cluster written by and published by . This book was released on 2003 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Hall thruster cluster is an attractive propulsion approach for spacecraft requiring very high-power electric propulsion systems. This article presents plasma density, electron temperature, and plasma potential data collected with a combination of triple Langmuir probes and floating emissive probes in the plume of a low-power, four-engine Hall thruster cluster. Simple analytical formulas are introduced that allow these quantities to be predicted downstream of a cluster based solely on the known plume properties of a single thruster. Ion energy distribution functions measured using both a parallel plate electrostatic analyzer and a retarding potential analyzer are presented. A cluster of Hall thrusters is shown to exhibit dramatically different ion energy profiles compared to a single thruster. In particular, clustering causes a significant increase in the fraction of ions at energies below the primary peak in the distribution, most likely due to an increase in elastic scattering and the effects of the unique plasma potential profiles in the cluster plume.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720608516 Total Pages :94 pages Book Rating :4.6/5 (85 download)
Book Synopsis Langmuir Probe Spacecraft Potential End Item Specification Document by : National Aeronautics and Space Administration (NASA)
Download or read book Langmuir Probe Spacecraft Potential End Item Specification Document written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes the Langmuir Probe Spacecraft Potential (LPSP) investigation of the plasma environment in the vicinity of the ProSEDS Delta II spacecraft. This investigation will employ a group of three (3) Langmuir Probe Assemblies, LPAs, mounted on the Delta II second stage to measure the electron density and temperature (n(sub e) and T(sub e)), the ion density (n(sub i)), and the spacecraft potential (V(sub s)) relative to the surrounding ionospheric plasma. This document is also intended to define the technical requirements and flight-vehicle installation interfaces for the design, development, assembly, testing, qualification, and operation of the LPSP subsystem for the Propulsive Small Expendable Deployer System (ProSEDS) and its associated Ground Support Equipment (GSE). This document also defines the interfaces between the LPSP instrument and the ProSEDS Delta II spacecraft, as well as the design, fabrication, operation, and other requirements established to meet the mission objectives. The LPSP is the primary measurement instrument designed to characterize the background plasma environment and is a supporting instrument for measuring spacecraft potential of the Delta II vehicle used for the ProSEDS mission. Specifically, the LPSP will use the three LPAs equally spaced around the Delta II body to make measurements of the ambient ionospheric plasma during passive operations to aid in validating existing models of electrodynamic-tether propulsion. These same probes will also be used to measure Delta II spacecraft potential when active operations occur. When the electron emitting plasma contractor is on, dense neutral plasma is emitted. Effective operation of the plasma contactor (PC) will mean a low potential difference between the Delta II second stage and the surrounding plasma and represents one of the voltage parameters needed to fully characterize the electrodynamic-tether closed circuit. Given that the LP already needs to be well away from any ne
Book Synopsis Pulsed Plasma Thruster Plume Measurements Using a Triple Langmuir Probe Method by : L. Byrne
Download or read book Pulsed Plasma Thruster Plume Measurements Using a Triple Langmuir Probe Method written by L. Byrne and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement Techniques in Space Plasmas by : Robert F. Pfaff
Download or read book Measurement Techniques in Space Plasmas written by Robert F. Pfaff and published by American Geophysical Union. This book was released on 1998-02-04 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 102. Space plasma measurements are conducted in a hostile, remote environment. The art and science of measurements gathered in space depend therefore on unique instrument designs and fabrication methods to an extent perhaps unprecedented in experimental physics. In-situ measurement of space plasmas constitutes an expensive, unforgiving, and highly visible form of scientific endeavor.
Book Synopsis Measurement Techniques in Space Plasmas by : Robert F. Pfaff
Download or read book Measurement Techniques in Space Plasmas written by Robert F. Pfaff and published by American Geophysical Union. This book was released on 1998-02-04 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 103. Space plasma measurements are conducted in a hostile, remote environment. The art and science of measurements gathered in space depend therefore on unique instrument designs and fabrication methods to an extent perhaps unprecedented in experimental physics. In-situ measurement of space plasmas constitutes an expensive, unforgiving, and highly visible form of scientific endeavor.
Author :NASA-University Conference on the Science and Technology of Space Exploration Publisher : ISBN 13 : Total Pages :92 pages Book Rating :4.F/5 ( download)
Book Synopsis Plasma Physics and Magnetohydrodynamics in Space Exploration by : NASA-University Conference on the Science and Technology of Space Exploration
Download or read book Plasma Physics and Magnetohydrodynamics in Space Exploration written by NASA-University Conference on the Science and Technology of Space Exploration and published by . This book was released on 1963 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characteristics of the NASA Lewis bumpy-torus plasma generated with positive applied potentials by : J. Reece Roth
Download or read book Characteristics of the NASA Lewis bumpy-torus plasma generated with positive applied potentials written by J. Reece Roth and published by . This book was released on 1976 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
