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Analysis of LEAM experiment response to charged particles

Show simple item record Perkins, Donald H. 2015-09-09T22:26:42Z 2015-09-09T22:26:42Z 1976
dc.identifier.other 31111000649820
dc.description.abstract The objectives of the Lunar Ejecta and Meteorites Experiment (LEAM) were to measure the long-term variations in cosmic dust influx rates and the extent and nature of the lunar ejecta. While analyzing these characteristics in the data, it was discovered that a majority of the events could not be associated with hypervelocity particle impacts of the type usually identified with cosmic dust, but could only be correlated with the lunar surface and local sun angle. The possibility that charged particles could be incident on the sensors led to an analysis of the electronics to determine if such signals could cause the large pulse height analysis (PHA) signals. A qualitative analysis of the PHA circuit showed that an alternative mode of operation existed if the input signal were composed of pulses with pulse durations very long compared to the durations for which it was designed. This alternative mode would give large PHA outputs even though the actual input amplitudes were small. This revelation led to the examination of the sensor and its response to charged particles to determine the type of signals that could be expected.
dc.description.sponsorship NASA Contract No. NAS9-14751
dc.description.statementofresponsibility prepared by D. Perkins.
dc.format.extent 143 leaves
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher Bendix Aerospace Systems Division
dc.relation.ispartofseries NASA contractor report ; NASA CR-147872.
dc.subject.lcc QB791
dc.subject.lcsh Lunar dust
dc.subject.lcsh Apollo Lunar Surface Experiments Package
dc.subject.lcsh Lunar Ejecta and Meteorites Experiment
dc.title Analysis of LEAM experiment response to charged particles
dc.title.alternative Analysis of Lunar Ejecta and Meteorites Experiment response to charged particles

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