1 November 1990 SPAN high-speed photon-counting detector for the XMM optical monitor
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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