Download or read book Ion Collision Emission Excitation Cross Sections for Xenon Electric Thruster Plasmas written by and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energetic xenon ion collisions with neutral atoms play an important role in electric thruster plasma radiation at low electron temperatures. The respective emission excitation cross sections are necessary for the derivation of plasma parameters from the observed radiance. We present apparent emission excitation cross sections for near-infrared 5p(exp 5)6p to 5p(exp 5)6s transitions of neutral xenon impacted by singly and doubly charged xenon ions. The cross sections were measured over a laboratory energy-per-charge-number range of 100 to 900 eV, a range that covers typical Hall effect thruster discharge voltages. The cross sections are derived from ion beam luminescence spectra produced at single-collision conditions and at pressures for which radiation trapping effects were shown to be negligible. The Xe(exp 2+) cross sections are significantly higher than those of Xe2+ and increase with energy throughout the investigated range. The Xe(exp 2+) cross sections plateau at approximately 600 eV. The cross sections are incorporated in a collisional-radiative model. The calculations of near-infrared spectra demonstrate that the sensitivity of the model diagnostic with respect to electron temperature increases with ion energy.

Download or read book Electron Impact Excitation Cross Sections of Xenon for Optical Plasma Diagnostic written by and published by . This book was released on 2007 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project the researcher had taken up the calculation of xenon apparent emission-excitation cross sections for emission lines that have diagnostic value in the analysis of Xe-propelled electric thruster plasmas. Following conclusions were made from the study: The RDW method has been shown to be applicable to transitions between excited states. Since the excitation energy of these transitions is relatively small, first-order theories are valid at lower energies than for excitations from the ground states. The accuracy of the cross section depends crucially on the accuracy of the oscillator strengths obtained from the target wave functions. The use of a relativistic formalism "j-j coupling" clearly explains the huge variation in the magnitudes of these cross sections. The objectives of the project have been achieved and the aimed metastable excitation cross section results of xenon were obtained that are required for the CRM model of Dressler and co-workers and these are being tested and new plasma modeling results are under calculation.

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 Journal of Propulsion and Power written by and published by . This book was released on 2008 with total page 822 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 2023-10-25 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Electric Propulsion Understand the fundamental basis of spaceflight with this cutting-edge guide As spacecraft engineering continues to advance, so too do the propulsion methods by which human beings can seek out the stars. Ion thrusters and Hall thrusters have been the subject of considerable innovation in recent years, and spacecraft propulsion has never been more efficient. For professionals within and adjacent to spacecraft engineering, this is critical knowledge that can alter the future of space flight. Fundamentals of Electric Propulsion offers a thorough grounding in electric propulsion for spacecraft, particularly the features and mechanisms underlying Ion and Hall thrusters. Updated in the light of rapidly expanding knowledge, the second edition of this essential guide detailed coverage of thruster principles, plasma physics, and more. It reflects the historic output of the legendary Jet Propulsion Laboratory and promises to continue as a must-own volume for spacecraft engineering professionals. Readers of the second edition of Fundamentals of Electric Propulsion readers will also find: Extensive updates to chapters covering hollow cathodes and Hall thrusters, based on vigorous recent research New sections covering magnetic shielding, cathode plume instabilities, and more Figures and homework problems in each chapter to facilitate learning and retention Fundamentals of Electric Propulsion is an essential work for spacecraft engineers and researchers working in spacecraft propulsion and related fields, as well as graduate students in electric propulsion, aerospace science, and space science courses.

Download or read book Determination of Xenon Emission Cross Sections and the Origin of Their Anomalous Pressure Dependence written by John Thomas Fons and published by . This book was released on 1998 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NRL Plasma Formulary written by Joseph Donald Huba and published by . This book was released on 1998 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Updated Excitation and Ionization Cross Sections for Electron Impact on Atomic Oxygen written by Russ R. Laher and published by . This book was released on 1988 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Absolute Collisional Excitation Cross Section Measurements Using Crossed Molecular Beams written by Andrew Freedman and published by . This book was released on 1983 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of absolute excitation cross-sections of the asymmetric stretch mode (001) of H20 and C02 for collisions with atomic oxygen is important in understanding the signatures of high-altitude rocket plumes. Experiments are performed in a crossed molecular beam apparatus in which a CVF detector measures the collisionally-induced infrared fluorescent signal. Calibration and testing of the atomic oxygen source was completed. It was installed into the crossed beam apparatus and vacuum tested in preparation for performing the excitation cross-section measurements. Upper limits have been established for the excitation cross sections for the systems 0 + C02 and Ar + C02. The values determined are 0.03A squared for 0 + C02 at 3.85 km/sec and 0.003 A squared for Ar + C02 at 2.27 km/sec. Monte Carlo trajectory analysis of the data provides accurate correction factors to the raw data that account for kinematic and experimental constraints inherent in these measurements. It further shows that measurements near threshold cannot be used to determine the functional energy dependence of the cross section. Further modifications and improvements in the experimental approaches to improve sensitivity will be discussed.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Atomic and Molecular Collision Cross Sections of Interest in Controlled Thermonuclear Research written by C. F. Barnett and published by . This book was released on 1961 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lyman Alpha Emission Cross Sections for Collisions of 1 25 KeV H and H with CO CO2 CH4 and NH3 written by John H. Birely and published by . This book was released on 1972 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cross sections are reported for emission of Lyman-alpha radiation in collisions of H(+) and H with CO and CO2 in the 1-25 keV energy range and with CH4 and NH3 in the range 5-25 keV. An electric field was applied within the collision chamber and the increase in Lyman-alpha intensity was used to drive cross sections for formation of H(2s). Relationships are presented between the projectile excitation cross section and the cross section for electron capture in H(+) impact or stripping in H impact which are relatively independent of the identity of the target molecule. (Author).

Download or read book Electron Impact Excitation Cross Sections and Effective Collision Strengths of N Atom and N like Ions written by Takako Katō and published by . This book was released on 1992 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Differential Cross Sections for Electron Emission in Heavy Ion atom Collisions written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The systematics of differential ionization cross sections are explored for incident charged particles which possess atomic structure. Although little has been published regarding outer shell ionization by structured projectiles, sufficient data are becoming available to provide some insight into the collision process. This discussion concentrates on systematics of emission cross sections for the intermediate and high energy projectiles where the applicability of high energy approximations can be tested and the dramatic changes in emission spectra observed as the projectile energies decrease. Since heavy ion interactions are important in many research fields, it is particularly useful to determine where simple methods of cross section scaling may be appropriate.

Download or read book Towards Absolute Ionic Excitation Cross sections by Electron Impact on Laser produced Plasmas written by G. A. Proca and published by . This book was released on 1972 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Absolute Cross Sections for Excitation of Neon by Impact of 20 180 KeV H H2 and He Ions written by George William York (Jr) and published by . This book was released on 1971 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The technique of heavy-ion energy-loss spectrometry has been used to measure excitation cross sections for the (2p5)3s and (2p5)3p electronic configurations of Neon. The incident particles used were H, H+2 and He+ at impact energies from 20-180 keV. The results are compared with previous optical measurements of the emission cross sections of lines from these levels as excited by H+ and He+ impact. Agreement is not good, either in shape or in absolute magnitude for excitation of the (2p5)3s configuration. However, agreement is surprisingly good for excitation of the (2p5)3p configuration. A curve fitting technique has been applied to extract relative singlet-triplet cross sections for levels within the (2p5)3s configuration. Almost no triplet excitation is observed for H+ and H+2 impact. The former is expected while the latter is somewhat surprising. Significant triplet excitation is observed only for He+ impact"--Abstract, leaf ii.

Download or read book Introduction to Plasma Physics and Controlled Fusion written by Francis F. Chen and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: TO THE SECOND EDITION In the nine years since this book was first written, rapid progress has been made scientifically in nuclear fusion, space physics, and nonlinear plasma theory. At the same time, the energy shortage on the one hand and the exploration of Jupiter and Saturn on the other have increased the national awareness of the important applications of plasma physics to energy production and to the understanding of our space environment. In magnetic confinement fusion, this period has seen the attainment 13 of a Lawson number nTE of 2 x 10 cm -3 sec in the Alcator tokamaks at MIT; neutral-beam heating of the PL T tokamak at Princeton to KTi = 6. 5 keV; increase of average ß to 3%-5% in tokamaks at Oak Ridge and General Atomic; and the stabilization of mirror-confined plasmas at Livermore, together with injection of ion current to near field-reversal conditions in the 2XIIß device. Invention of the tandem mirror has given magnetic confinement a new and exciting dimension. New ideas have emerged, such as the compact torus, surface-field devices, and the EßT mirror-torus hybrid, and some old ideas, such as the stellarator and the reversed-field pinch, have been revived. Radiofrequency heat ing has become a new star with its promise of dc current drive. Perhaps most importantly, great progress has been made in the understanding of the MHD behavior of toroidal plasmas: tearing modes, magnetic Vll Vlll islands, and disruptions.