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We report on an apparatus able to measure the absolute detection efficiencyof a detector for electrons in the 30 - 900 eV range. In particular, we discussthe characterisation of a two-stage chevron microchannel plate (MCP). Themeasurements have been performed in the LASEC laboratory at Roma TreUniversity, whit a custom-made electron gun. The very good stability of thebeam current in the fA range, together with the picoammeter nominal resolutionof 0.01 fA, allowed the measurement of the MCP absolute efficiency $\epsilon$.We found an $\epsilon$ = (0.489 $\pm$ 0.003) with no evident energy dependence.We fully characterised the MCP pulse shape distribution, which isquasi-Gaussian with a well visible peak above the noise level. We measured a68% variation of the average pulse height between 30 and 500 eV. Furthermore,with a deeper analysis of the pulse shape, and in particular of the correlationbetween pulse height, area and width, we found a method to discriminate single-and multi- electron events occurring within a 10 ns time window.

Absolute efficiency of a two-stage microchannel plate for electrons in the 30 - 900 eV energy range