Abstract
This paper contains the results of measurements to determine the absolute counting efficiencies and pulse height distributions of a continuous channel electron multiplier (Spiraltron) used in the detection of hydrogen, argon, and xenon ions. The technique involves the post-acceleration of 8-eV ion beams to energies between 100 and 4000 eV. The absolute counting efficiency versus effective ion energy for the ions H2+, A+, and Xe+ is given. The Spiraltron was operated in a marginally gain saturated mode to investigate the charge pulse distribution for the three ions H2+, A+, and Xe+ at ion energies of 3 keV. The pulse height distribution for the light ion H2+ peaked near an equivalent gain of 2×107, while the distributions for the heavier ions displayed no significant peaks. This study suggests that discrimination between light and heavy ions may be accomplished in the energy range E<2 keV by utilizing continuous channel electron multipliers.
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