Abstract
Solar and Heliospheric Observatory (SOHO) is a European Space Agency project scheduled for launch in 1995. Part of its payload will be a coronal diagnostic spectrometer that includes a grazing incidence spectrometer (GIS) with four detectors set at nonoverlapping wavelength ranges between 15.5 and 78.7 nm. The UV detectors are being developed at MSSL and consist of microchannel plate (MCP) stacks with one-dimensional SPAN anode readout. The dimensions of the sensitive area of each detector is 50×16 mm and it is required that 47-μm FWHM positional resolution is obtained in the 50 mm direction together with a throughput of 100 000 counts/s (random). The design of the detector system and readout electronics is described. A Monte Carlo PC based simulator has been developed to support the research program and permit an early optimization of various parameters.
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