The size and spatial distribution of microchannel plate output electron clouds

Physics – Atomic Physics

Scientific paper

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Electron Clouds, Imaging Techniques, Microchannel Plates, Spatial Distribution, Data Reduction, Electric Potential, Gaps

Scientific paper

An experimental technique for measuring the spatial distribution of the output charge cloud from a microchannel plate (MCP), using a planar, charge-division-type anode is discussed. The anode simultaneously measures, for each charge cloud, both the position of the charge centroid and the fractional charge falling to one side of the split in the pattern. The measurements from several thousand events have been combined to calculate the average spatial distribution of the electron cloud and the dominant factors influencing the charge cloud distribution have been found to be the MCP gain and the MCP-anode accelerating field and geometry. Experimental research on the two dominant factors with respect to ranges of distribution is presented.

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