1 November 1990 SPAN high-speed photon-counting detector for the XMM optical monitor
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Abstract
The compact photon-counting detector SPAN is described which offers 25-micron spatial resolution and a 25-mm imaging diam. The SPAN detector incorporates position readout within a vacuum-sealed optical-intensifier tube, and a photocathode is used to sense the images with high-blue and near-UV sensitivity. A microchannel-plate intensifier generates an electron cloud that is measured with a position-sensitive readout developed for this application. The position-sensitive readout is a conductive device that, in the context of the SPAN, permits a high count rate and spatial resolution greater than the charge-measurement precision of each electrode. Preliminary photon counting is demonstrated, and the results suggest that the SPAN has a resolution of better than 1/1000 and effective linearity with 8-bit digitization.
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Jonathan S. Lapington, Jonathan S. Lapington, Michael L. Edgar, Michael L. Edgar, Mark S. Cropper, Mark S. Cropper, Keith O. Mason, Keith O. Mason, } "SPAN high-speed photon-counting detector for the XMM optical monitor", Proc. SPIE 1344, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy, (1 November 1990); doi: 10.1117/12.23270; https://doi.org/10.1117/12.23270
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