Photon-Counting Detector Arrays Based on Microchannel Array Plates

Abstract

The recent development of the channel electron multiplier (CEM) and its miniaturization into the microchannel array plate (MCP) offers for the first time the possibility of fully combining the advantages of the photographic and photoelectric detection systems. The MCP has an image-intensifying capability and has the potential of being developed to yield signal outputs superior to those of conventional photomultipliers. In particular, the MCP has a photon-counting capability with a negligible dark count rate. Furthermore, the MCP can operate stably and efficiently at extreme ultraviolet and soft x-ray wavelengths in a windowless configuration or can be integrated with a photo- cathode in a sealed tube for use at ultraviolet and visible wavelengths. The operation of one-and two-dimensional photon- counting detector arrays based on the MCP at extreme ultraviolet wavelengths will be described and the design of sealed arrays for use at ultraviolet and visible wavelengths briefly discussed.