Feedback limited microchannel plate.

摘要

A microchannel plate achieves a lower noise figure by providing an output electrode (126) comprising a conductive layer which closes off at least 10 percent of the open area (132) of the output end of its multitude of channels. The preferred range of closure is 10 to 85 percent and 75 percent closure is particularly useful. The plate finds application in a wafer tube image intensifier. The invention also includes a method of making such a plate and a method of limiting feedback, in particular X-ray feedback, in a wafer image intensifier using such a plate. Said conductive layer (126) and/or microchannel may in addition be textured. <IMAGE>