Download or read book Calculational Procedure for Evaluating Time and Spatial Dependent Energy Deposition in Air for Anisotropic Nuclear Sources Volume I Technical Discussion written by M. B. Wells and published by . This book was released on 1979 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the RENDER calculational procedure that was developed for use in evaluating the spatial- and time-dependent energy deposition in air produced by anisotropic nuclear sources. The RENDER procedure utilizes nuclear energy deposition data generated for conical sources that were originally computed for line-beam sources through use of the ZAP, ZAPN, ZAPGAM and DEPO codes. The energy deposition data for air that are input to RENDER were generated for neutron and gamma-ray sources and for secondary gamma rays resulting from neutron capture and inelastic scattering in air. The energy deposition data for line-beam sources and for point isotropic sources were found to compare favorably with similar data reported in the literature. The RENDER procedure was run utilizing energy deposition data from the conical source-data base for a 9-to-10-MeV gamma-ray source and the results of the convolution over source emission direction and time were found to be in good agreement with the input data, indicating that the RENDER procedure performs the time-and-angle convolution correctly.
Download or read book Calculational Procedure for Evaluating Time and Spatial Dependent Energy Deposition in Air for Anisotropic Nuclear Sources Volume II Data for Isotropic Gamma Ray Sources written by M. B. Wells and published by . This book was released on 1979 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents calculated time dependent energy deposition data for point isotropic gamma-ray sources emitting radiation in the source energy intervals. The radial intervals used in storing the energy deposition data are given. The delay time intervals used to store the energy deposition data are also given. The delay time is the time of energy deposition minus the time of arrival of the uncollided radiation. All source photons were emitted instantaneously by the source. The calculational methods used to compute the energy deposition data are described in Vol. I of this report.
Download or read book Calculational Procedure for Evaluating Time and Spatial Dependent Energy Deposition in Air for Anisotropic Nuclear Sources Volume 5 Data for Line Beam Sources written by M. B. Wells and published by . This book was released on 1979 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents calculated time integrated energy deposition data for line beam gamma-ray and neutron sources emitting radiation in the source energy intervals The radial and polar angle intervals used in storing the energy deposition data are given. The geometry used in the energy deposition calculation is shown. The source radiation (neutron or gamma ray) is emitted from the source point in the direction Theta = 0 deg. The energy deposition was determined for regions formed by the intersection of the conical surfaces generated by the revolution of the radii R sub (i-1) and R sub i inclined at polar angles Theta sub (j-1) and Theta sub j, respectively about the source axis and the spherical surfaces formed by the revolution of the radii R sub (i-1) and R sub i about the source point. The calculational methods used to compute energy deposition data in air for line beam nuclear sources are described in Vol. I of this report.
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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.
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