This paper discusses how the heating temperature affects the geometrical dimensions of microchannel plates (MCPs) and the single capillaries from which MCPs are made in the softening and viscous-flow interval of glass. It is shown that the ratio of the thickness of an MCP to its diameter, i.e., the caliber of an MCP, remains unchanged during thermal shrinkage. Relationships are obtained from which the current geometrical dimensions of MCPs when they are heated can be calculated from their initial parameters. A certain lag of the axial shrinkage with respect to the radial shrinkage is observed at the initial stage of heat shrinkage, especially at relatively low temperatures.

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