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Imaging microchannel plate detectors for XUV sky survey experimentsM.A. Barstow, G.W. Fraser and S.R. MilwardX -ray astronomy group, Department of PhysicsUniversity of Leicester, Leicester LE1 7RH EnglandAbstractWe describe the development of microchannel plate detectors for the Wide Field Camera(WFC) XUV (50 -300A) sky survey experiment on ROSAT. A novel feature of the detector designis that the microchannel plates (MCPs) and their resistive anode readout are curved to thesame radius as the WFC telescope focal surface. We show that curving the channel plates isnot detrimental to gain uniformity. We describe the design of a curved resistive anodereadout element and contrast our measurements of spatial resolution, global and localuniformity and temperature coefficient of resistance with the poor performance recentlyascribed to resistive anodes in the literature. We present the first measurements of thequantum detection efficiency of a CsI- coated MCP in the wavelength range 67 -256A.IntroductionCosmic Extreme Ultraviolet (EUV) astronomy is a young science. At present only a fewsources are known but there is evidence that many more may exist. The next major stepsforward in this field will be the all sky - surveys performed by the UK Wide Field Camera |
