Abstract
We have developed two imaging devices(25 and 40 active areas) using microchannel plate (MCP) intensifiers with 25 and 40 mm active areas that employ the wedge and strip readout system. Both devices use a fiber optic input window proximity coupled to a Z stack of microchannel plates. The 25 mm device has an S-20 cathode and uses an A12O3protective layer. On the top MCP, whereas the 40 mm device has a bi-alkali photocathode and no MCP protective layer. Both tubes display peaked pulse amplitude distributions (~60% full width half maximum- FWHM) for single photon events. The 25 mm device has a background of ~250 events sec−1when cooled to −15o C, and achieves a resolution of ~70 µm FWHM at a gain of 1×107. The 40 mm device has a background of ~7 events sec−1at room temperature and attains a resolution of ~70 µm FWHM at a gain of 1.5×107The image linearity and flat field characteristics are generally good, although some anomalies are visible in the photocathode of the 40 mm device.
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