Abstract
The variation of microchannel plate (MCP) pulse gain, pulse transit time and transit time spread with channel diameter and length-to-diameter ratio is described, using a variable-spacing dynode model of the electron avalanche which accounts for the effects of wall charge saturation. The analysis includes a description of the response of a single microchannel to the prompt arrival of N electrons, thus providing a microscopic basis for the empirical laws currently used to describe the gain of two- or three-stage MCP multipliers. Preliminary results of microchannel plate gain fatigue “lifetests” conducted in software are described. Finally, an expression is derived for the gain of a microchannel plate, as a function of bias voltage, in the presence of a strong axial magnetic field. Here, as throughout the paper, the results of calculation are compared with experiment.
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