Absolute quantum efficiencies of micro-channelplates for 8-28 keV electrons

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Abstract
Absolute measurements of the quantum efficiency for electrons with 8-28 keV energies and input angles between 3 and 23 degrees are reported. The results are extrapolated to 100 keV. An experimental electron optical bench is used to generate an electron beam with energies up to 30 keV. The beam is focused by means of two magnetic lenses onto the input surface of a channelplate detector. The channelplate detector is preceded by a 'grey-filter' arrangement in order to reduce the primary current by a known amount. In this way the primary beam can be conveniently measured by an electrometer and at the same time be counted by the channelplate detector.

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