Abstract: The present 18 mm active diameter proximity focused microchannel plate (MCP) image tube design has been modified to produce significantly higher limiting spatial resolution. A glass input window of the 'bulls-eye' design with the blackened glass border, reduced cathode-to- MCP spacing, reduced channel center-to-center distance, reduced MCP-to-phosphor screen spacing, a brushed P20 phosphor screen, and a fiberoptic output window were used to achieve a limiting resolution in excess of 50 lp/mm. Test results, showing limiting resolution vs applied potentials, are correlated with a simple physical model of performance. The low-light- level white-light sinewave modulation transfer function, T(f), has been measured to be T(f) $EQ exp ($MIN@(f/21.5)$+1.46$/), where f is the spatial frequency in cycles per millimeter.!
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