Patent ID: 7687978
Filing Date: 2010-03-30
Classification: H01J

Abstract:
1. A channel electron multiplier comprising: a single channel CEM for receiving an input particle; a multi-channel CEM positioned after the single channel CEM for receiving emissions from the single channel CEM, wherein the single channel CEM and multi-channel CEM are contained in a common housing, in a monolithic construction; an electron collector positioned after the multi-channel CEM for generating a pulse current in response to emissions from the multi-channel CEM; a funnel for directing the particle to the single channel CEM; and a further multi-channel CEM positioned after the multi-channel CEM for receiving emissions from the multi-channel CEM; wherein the electron collector positioned after the further multi-channel CEM for generating a pulse current in response to emissions from the further multi-channel CEM; wherein the multi-channel CEM includes a plurality of single body CEM units, the single body CEM units including multiple channels; wherein a spacing between the single channel CEM and the multi-channel CEM is based on inter channel spacing of the channels in the multi-channel CEM.