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In order to take full advantage of the telescope resolution, both the pair of MCPs in the detector and the resistive anode readout system are curved, like a watchglass, to match the optimum focal surface. A CsI photocathode is deposited directly onto the front face of the front MCP to enhance the EUV quantum efficiency. The detector spatial resolution is substantially (a factor >2) better than that of the mirror nest and consequently does not contribute significantly to the net performance of the WFC. A focal plane turntable can be used to select one of two identical detector assemblies in flight. Table 6.2 gives details of the detectors.
|Radius of curvature|
|Front MCP bias angle|
|Rear MCP bias angle|
|Photocathode (front MCP only)||CsI|