STUDY AND DEVELOPMENT OF THE PAUL-TYPE MASS SPECTROMETER.
CONSOLIDATED ELECTRODYNAMICS CORP PASADENA CA
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This project is directed toward the application of the quadrupole mass filter to the analysis of the composition of the earths upper atmosphere. The first year was devoted to theoretical and experimental exploration of the operation of the device. Significant contributions were made to the theory of the operation of the mass filter, and several experiments leading to improved understanding of the device were performed. The latter explored the transmission of the filter as functions of the position and angle at which the ions enter the filter, the energy of excitation of the filter, and the details of the entrance geometry. It was found that the addition of an auxiliary set of electrodes placed near the entrance aperture greatly improves the transmission efficiency for ions which enter the filter under unfavorable conditions. Following the theoretical and experimental studies, two flyable mass filters were designed, built, and tested. These have no ion source, and are responsive to the ambient ions picked up by the motion of the satellite vehicle. Unit resolution to mass 44 is readily obtained with these systems. They are responsive either to positive or to negative ions. The design objectives are easily met with this apparatus. Author