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Low Noise Microchannel Plates

A new type of microchannel plate (MCP) is described which possesses extremely low intrinsic background noise. This property was achieved by fabricating the MCP from a newly developed glass formulation which was designed to be essentially free of radioisotopes. New measurements are presented on recently fabricated low noise MCPs which show that these plates yield background count rates several times lower than the quietest MCPs available. The results of radioisotope assays performed on the first two groups of prototype low noise MCPs are reported; these assays suggest that even further reductions in noise can be achieved. Improvements made possible in the sensitivity of MCP detectors are discussed.