Download or read book Secondary Electron Generation Emission and Transport Effects on Spacecraft Charging and NASCAP Models written by Ira Katz and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary electron phenomena play an important role in many aspects of spacecraft charging. This paper discusses three distinct cases that show: 1)A good formulation for the secondary electron yield as a function of incident electron energy is needed in order to determine whether a given particle spectrum will cause strong negative charging for a given spacecraft material; 2) Suppression of secondary electron emission by electric fields plays a dominant role in sunlight charging; and 3) Surface conductivity associated with the presence of a secondary electron layer plays a key role in enhancing the current collection by small, positively biased pinholes or interconnects. The treatments of these various aspects of secondary electron phenomena in the NASCAP and NASCAP/LEO codes provide good quantitative results for secondary electron effects. Errors are probably due to uncertainties in the input parameters to the codes and to uncertainties in experimental measurements than to inadequacies in the code formulations.
Download or read book Physics of Satellite Surface Charging written by Shu T. Lai and published by CRC Press. This book was released on 2022-03-18 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will explore the fundamentals of spacecraft charging: why it occurs, when it occurs, where it occurs, how to measure it, and its side effects. It will discuss state-of-the-art spacecraft charging technologies, which will be explained in detail and with pedagogical emphasis. Exercises for further learning will be included to facilitate a deeper understanding of the material. It will be of interest to advanced undergraduate and graduate students, in addition to researchers working in physics and engineering keen to understand more about spacecraft interactions with space plasmas. Key Features: Translates complex terminology into accessible language Authored by experts in the field Provides worked examples and exercises for further learning
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Spacecraft Charging Technology Conference written by C. P. Pike and published by . This book was released on 1977 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Spacecraft Charging Technology Conference, sponsored by the USAF and NASA, was held in October 1976. The Proceedings contain over 50 papers dealing with subjects including: (1) the geosynchronous plasma environment, (2) spacecraft modeling, (3) spacecraft materials characterization, (4) spacecraft materials development, (5) satellite design and test. In addition, an executive summary and the transcript of a panel discussion are included. (Author).
Download or read book The Importance of Accurate Secondary Electron Yields in Modeling Spacecraft Charging written by and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spacecraft charging has commonly been attributed to electrons with several kilovolts of energy impinging upon spacecraft surfaces. Recent experimental evidence from the SCATHA satellite has shown that charging correlates well with electrons of energies greater than 30 keV. In this paper it is shown that the SCATHA observations are consistent with the model of charging in which a satellite is immersed in a Maxwellian plasma, particle collection is orbit limited, and dominant surface effects are the emission of secondary and backscattered electrons. The energy dependence of the secondary yield for multi-kilovolt incident electrons determines the charging threshold. In the past, inadequate representations of the secondary yield have led experimenters to question the validity of the charging model. The accuracy of the secondary electron yield formulation based on electron stopping power, such as the one in the NASCAP and POLAR charging codes, gives good agreement with the SCATHA results. A Maxwellian representation of the magnetospehric plasma is justified by choosing effective temperatures and densities that minimize the error in calculating charging current densities. Keywords: Spacecraft Charging, Secondary Electrons; POLAR Analytical Modeling.
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1988 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 1684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1988 with total page 1600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1988 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1988 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1996 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Differential Charging Model for Synchronous Satellites written by Weiwei Li and published by . This book was released on 1990 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Instrument for Experimental Secondary Electron Emission Investigations with Application to the Spacecraft Charging Problem written by Robert E. Davies and published by . This book was released on 1996 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary electron emission (SEE) and incident-particle backscattering are important processes accompanying the impact of energetic electrons and ions on surfaces. The phenomena play a key role in the buildup of electrical charge on spacecraft surfaces, and are therefore of particular interest to scientists attempting to model spacecraft charging. In response to a demonstrated need for data, techniques for determining total secondary electron (SE) and backscatter (BS) yields (del) and (neu), and associated scattering-angle-resolved,scattering-energy-resolved, and simultaneous angle-energy-resolved yields have been developed. Further, an apparatus capable of making the necessary measurements for experimental determination of these quantities---for conducting materials in an ultra-high vacuum environment-has been designed, constructed, and partially tested.
Download or read book Physics Briefs written by and published by . This book was released on 1988 with total page 1370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Secondary Electron Emission on Charging written by M. S. Leung and published by . This book was released on 1976 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AGARD Index of Publications written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1986 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
