The effect of microchannel plate gain depression on PAPA photon counting cameras

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cameras, Image Intensifiers, Microchannel Plates, Photon Beams, Radiation Counters, Astronomical Photography, Atmospheric Turbulence, Speckle Interferometry

Scientific paper

PAPA (precision analog photon address) cameras are photon counting imagers which employ microchannel plates (MCPs) for image intensification. They have been used extensively in astronomical speckle imaging. The PAPA camera can produce artifacts when light incident on its MCP is highly concentrated. The effect is exacerbated by adjusting the strobe detection level too low, so that the camera accepts very small MCP pulses. The artifacts can occur even at low total count rates if the image has highly a concentrated bright spot. This paper describes how to optimize PAPA camera electronics, and describes six techniques which can avoid or minimize addressing errors.

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