Controlled gain electron multiplier - uses two microchannel plates mounted one on other and having main surfaces held at different electric potentials

摘要

The electron multiplier has high controlled amplification at low noise levels and is based on a design using microchannel plates, with secondary electron emission. It comprises first and second microchannel plates the second being mounted on the first. The dia. of the second plate's channels is then less than that of the first plate's channels. The electric potentials applied to the main surfaces of the first plate are so calculated that each of the microchannels works in the saturation region of the gain characteristic. The electric potentials applied to the other main surfaces of the second plate are such that the second plate works in the gain characteristic's saturation region as a result of multiplication of the output charge from the first microchannel plate.