27 April 2010 Cross strip microchannel plate imaging photon counters with high time resolution
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Abstract
We have implemented cross strip readout microchannel plate detectors in 18 mm active area format including open face (UV/particle) and sealed tube (optical) configurations. These have been tested with a field programmable gate array based parallel channel electronics for event encoding which can process high input event rates (> 5 MHz) with high spatial resolution. Using small pore MCPs (6 μm) operated in a pair, we achieve gains of >5 x 105 which is sufficient to provide spatial resolution of <35 μm FHWM, with self triggered event timing accuracy of ~2 ns for sealed tube optical sensors. A peak quantum efficiency of ~19% at 500 nm has been achieved with SuperGenII photocathodes that have response over the 400 nm to 900 nm range. Local area counting rates of up to >200 events/mcp pore sec-1 have been attained, along with image linearity and stability to better than 50 μm.
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Oswald H. W. Siegmund, John V. Vallerga, Anton S. Tremsin, Laura C. Stonehill, Robert Shirey, Michael W. Rabin, David C Thompson, "Cross strip microchannel plate imaging photon counters with high time resolution", Proc. SPIE 7681, Advanced Photon Counting Techniques IV, 768109 (27 April 2010); doi: 10.1117/12.846888; https://doi.org/10.1117/12.846888
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