Considerations in the selection of de vs ac power systems for high power space applications CORBETT, R. E. (Lockheed Missiles and Space Co., Inc., Sunnyvale, CA) IN: IECEC '83; Proceedings of the Eighteenth Intersociety Energy Conversion Engineering Conference, Orlando, FL, August 21-26, 1983, Volume 3 (A84-30102 13-20). New York, American Institute of Chemical Engineers, 1983, p. 1164-1169. 8 Refs. Language: English Country of Origin: United States. Country of Publication: United States Document Type: CONFERENCE PAPER Most documents available from AI A A Technical Library Journal Announcement: IAA8413 The use of alternating current (ac) in satellite power systems has been the subject of occasional study for a number of years. Recent studies have considered the advantages of ac power for high-power space systems such as the NASA multihundred kilowatt (MHKW) platform technology area. The definitive comparative evaluation has not been performed to date, principally due to the breadth and depth of the technical issues involved and the strong opinions often held by advocates of one position or another. An attempt is made at examination of the technical issues and the motivations for the technologists' opinions. A summary is made of the issues and relative strength of the arguments on each side. It is concluded that the relative quantity of load rating versus source rating and the load voltage regulation requirement are key factors in the suitability of a specific ac or de power system for a specific mission. Areas requiring further study to settle the technical arguments are reviewed. (Author) Source of Abstract (Subfile): AIAA/TIS Descriptors: * ALTERNATING CURRENT; *DIRECT CURRENT; *SPACE- CRAFT POWER SUPPLIES; * SYSTEMS ENGINEERING; BLOCK DIAGRAMS; CIRCUIT DIAGRAMS; EQUIPMENT SPECIFICATIONS; SATELLITE SOLAR ENERGY CONVERSION; TRANSISTOR CIRCUITS Subject Classification: 7520 Spacecraft Propulsion & Power (1975- ) High-gain 35-GHz free-electron laser-amplifier experiment GOLD, S. H.; HARDESTY, D. L.; KINKEAD, A. K. (U.S. Navy, Naval Research Laboratory, Washington DC); BARNETT, L. R. (Utah, University, Salt Lake City, UT); GRANATSTEIN, V. L. (Maryland, University, College Park, MD) Physical Review Letters (ISSN 0031-9007), vol. 52, April 2, 1984, p. 1218-1221. Navy-supported research. 13 Refs. Language: English Country of Origin: United States. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AI A A Technical Library Journal Announcement: IAA8411 The efficient operation of a high-gain collective free-electron-laser (FEL) amplifier is demonstrated experimentally. The device investigated comprises a magnetron (20 kW, 500-nsec pulses at 35.02 GHz), a 20-dB-directivity input coupler for TE(U)-mode vertical polarization, the FEL interaction region (3-cm-period 63-cm- uniform-field-length wiggler field adjustable up to 4 kG, axial field up to 20 kG, and
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