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NASA Technical Note
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A Satellite Ion-electron Collector
The effects of grid transparency, photoemission, and secondary emission on the currents measured by an ion-electron collector experiment flown on OGO I are examined in detail. The calculated grid transparencies agree with laboratory tests. The measured photocurrents as a function of angle of incidence i agree reasonably well with the calculated current assuming the yield is proportional to (cos i + sec i). Equations are derived for the effects or secondary emission on the background currents caused by particles with energies greater than 30 eV, from which the fluxes and yields may be at times be calculated. The energies of the primaries can be estimated from the calculated secondary yields.
Nuclear Science Abstracts
NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
