Survey of the Air Force P78-2 (SCATHA)--satellite plasma wave data during electron gun operations
Lowery, Donald Ray
Olsen, Richard C.
MetadataShow full item record
The Air Force P78-2 satellite, known as SCATHA, was designed to study spacecraft charging processes at geosynchronous orbit. This thesis examines the plasma wave data taken during two periods when active experiments were conducted with the electron gun. Emissions at the electron gyrofrequency were stimulated by the operation of the electron gun on some occasions. These indicate interaction between the electron beam and plasma at local resonant frequencies of the plasma. A major objective of this thesis is to catalogue the characteristics of the plasma wave data common to the modes of operation of the electron gun. The purpose is to provide a baseline for analysis of data not only from SCATHA, but from other spacecraft including the space shuttle orbiter. Stimulated emissions at characteristic frequencies dependent on gun current and voltage were identified. These were consistently observed during the experiment presented here, and other events analyzed but not displayed.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Hart, D.A.; Oleson, N.L. (American Institute of Physics, 1969-10);Tonks-Dattner resonances were studied in active discharges of neon, argon, and xenon in the milliTorr pressure region where self-excited moving striations are also present. The observed resonance peaks are fewer and broader ...
Schwirzke, F. (1992);Local overheating, hot spots increase the influx of impurities at divertor target plates. A uniform energy deposition would be optimal. However, most discharges form small cathode spots which provide highly non-uniform ...
Yilmaz, Ali I. (Monterey, California. Naval Postgraduate School, 2012-06);Flashboard Plasma Cathodes (FBPCs) are potential rugged electron sources for generating high-current beams needed for future High Power Microwave Weapons. In FBPCs, dielectric material is in contact with electrodes in a ...